/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
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* ***************************************************************************/
using System;
using System.Diagnostics;
using System.Dynamic.Utils;
using System.Reflection;
using System.Runtime.CompilerServices;
#if SILVERLIGHT
using System.Core;
#endif
#if CLR2
namespace Microsoft.Scripting.Ast{
#else
namespace System.Linq.Expressions {
#endif
/// <summary>
/// Represents an expression that has a unary operator.
/// </summary>
#if !SILVERLIGHT
[DebuggerTypeProxy(typeof(Expression.UnaryExpressionProxy))]
#endif
public sealed class UnaryExpression : Expression {
private readonly Expression _operand;
private readonly MethodInfo _method;
private readonly ExpressionType _nodeType;
private readonly Type _type;
internal UnaryExpression(ExpressionType nodeType, Expression expression, Type type, MethodInfo method) {
_operand = expression;
_method = method;
_nodeType = nodeType;
_type = type;
}
/// <summary>
/// Gets the static type of the expression that this <see cref="Expression" /> represents. (Inherited from <see cref="Expression"/>.)
/// </summary>
/// <returns>The <see cref="Type"/> that represents the static type of the expression.</returns>
public sealed override Type Type {
get { return _type; }
}
/// <summary>
/// Returns the node type of this <see cref="Expression" />. (Inherited from <see cref="Expression" />.)
/// </summary>
/// <returns>The <see cref="ExpressionType"/> that represents this expression.</returns>
public sealed override ExpressionType NodeType {
get { return _nodeType; }
}
/// <summary>
/// Gets the operand of the unary operation.
/// </summary>
/// <returns> An <see cref="ExpressionType"/> that represents the operand of the unary operation.</returns>
public Expression Operand {
get { return _operand; }
}
/// <summary>
/// Gets the implementing method for the unary operation.
/// </summary>
/// <returns>The <see cref="MethodInfo"/> that represents the implementing method.</returns>
public MethodInfo Method {
get { return _method; }
}
/// <summary>
/// Gets a value that indicates whether the expression tree node represents a lifted call to an operator.
/// </summary>
/// <returns>true if the node represents a lifted call; otherwise, false.</returns>
public bool IsLifted {
get {
if (NodeType == ExpressionType.TypeAs || NodeType == ExpressionType.Quote || NodeType == ExpressionType.Throw) {
return false;
}
bool operandIsNullable = TypeUtils.IsNullableType(_operand.Type);
bool resultIsNullable = TypeUtils.IsNullableType(this.Type);
if (_method != null) {
return (operandIsNullable && !TypeUtils.AreEquivalent(_method.GetParametersCached()[0].ParameterType, _operand.Type)) ||
(resultIsNullable && !TypeUtils.AreEquivalent(_method.ReturnType, this.Type));
}
return operandIsNullable || resultIsNullable;
}
}
/// <summary>
/// Gets a value that indicates whether the expression tree node represents a lifted call to an operator whose return type is lifted to a nullable type.
/// </summary>
/// <returns>true if the operator's return type is lifted to a nullable type; otherwise, false.</returns>
public bool IsLiftedToNull {
get {
return IsLifted && TypeUtils.IsNullableType(this.Type);
}
}
/// <summary>
/// Dispatches to the specific visit method for this node type.
/// </summary>
protected internal override Expression Accept(ExpressionVisitor visitor) {
return visitor.VisitUnary(this);
}
/// <summary>
/// Gets a value that indicates whether the expression tree node can be reduced.
/// </summary>
public override bool CanReduce {
get {
switch (_nodeType) {
case ExpressionType.PreIncrementAssign:
case ExpressionType.PreDecrementAssign:
case ExpressionType.PostIncrementAssign:
case ExpressionType.PostDecrementAssign:
return true;
}
return false;
}
}
/// <summary>
/// Reduces the expression node to a simpler expression.
/// If CanReduce returns true, this should return a valid expression.
/// This method is allowed to return another node which itself
/// must be reduced.
/// </summary>
/// <returns>The reduced expression.</returns>
public override Expression Reduce() {
if (CanReduce) {
switch (_operand.NodeType) {
case ExpressionType.Index:
return ReduceIndex();
case ExpressionType.MemberAccess:
return ReduceMember();
default:
return ReduceVariable();
}
}
return this;
}
private bool IsPrefix {
get { return _nodeType == ExpressionType.PreIncrementAssign || _nodeType == ExpressionType.PreDecrementAssign; }
}
private UnaryExpression FunctionalOp(Expression operand) {
ExpressionType functional;
if (_nodeType == ExpressionType.PreIncrementAssign || _nodeType == ExpressionType.PostIncrementAssign) {
functional = ExpressionType.Increment;
} else {
functional = ExpressionType.Decrement;
}
return new UnaryExpression(functional, operand, operand.Type, _method);
}
private Expression ReduceVariable() {
if (IsPrefix) {
// (op) var
// ... is reduced into ...
// var = op(var)
return Assign(_operand, FunctionalOp(_operand));
}
// var (op)
// ... is reduced into ...
// temp = var
// var = op(var)
// temp
var temp = Parameter(_operand.Type, null);
return Block(
new[] { temp },
Assign(temp, _operand),
Assign(_operand, FunctionalOp(temp)),
temp
);
}
private Expression ReduceMember() {
var member = (MemberExpression)_operand;
if (member.Expression == null) {
//static member, reduce the same as variable
return ReduceVariable();
} else {
var temp1 = Parameter(member.Expression.Type, null);
var initTemp1 = Assign(temp1, member.Expression);
member = MakeMemberAccess(temp1, member.Member);
if (IsPrefix) {
// (op) value.member
// ... is reduced into ...
// temp1 = value
// temp1.member = op(temp1.member)
return Block(
new[] { temp1 },
initTemp1,
Assign(member, FunctionalOp(member))
);
}
// value.member (op)
// ... is reduced into ...
// temp1 = value
// temp2 = temp1.member
// temp1.member = op(temp2)
// temp2
var temp2 = Parameter(member.Type, null);
return Block(
new[] { temp1, temp2 },
initTemp1,
Assign(temp2, member),
Assign(member, FunctionalOp(temp2)),
temp2
);
}
}
private Expression ReduceIndex() {
// left[a0, a1, ... aN] (op)
//
// ... is reduced into ...
//
// tempObj = left
// tempArg0 = a0
// ...
// tempArgN = aN
// tempValue = tempObj[tempArg0, ... tempArgN]
// tempObj[tempArg0, ... tempArgN] = op(tempValue)
// tempValue
bool prefix = IsPrefix;
var index = (IndexExpression)_operand;
int count = index.Arguments.Count;
var block = new Expression[count + (prefix ? 2 : 4)];
var temps = new ParameterExpression[count + (prefix ? 1 : 2)];
var args = new ParameterExpression[count];
int i = 0;
temps[i] = Parameter(index.Object.Type, null);
block[i] = Assign(temps[i], index.Object);
i++;
while (i <= count) {
var arg = index.Arguments[i - 1];
args[i - 1] = temps[i] = Parameter(arg.Type, null);
block[i] = Assign(temps[i], arg);
i++;
}
index = MakeIndex(temps[0], index.Indexer, new TrueReadOnlyCollection<Expression>(args));
if (!prefix) {
var lastTemp = temps[i] = Parameter(index.Type, null);
block[i] = Assign(temps[i], index);
i++;
Debug.Assert(i == temps.Length);
block[i++] = Assign(index, FunctionalOp(lastTemp));
block[i++] = lastTemp;
} else {
Debug.Assert(i == temps.Length);
block[i++] = Assign(index, FunctionalOp(index));
}
Debug.Assert(i == block.Length);
return Block(new TrueReadOnlyCollection<ParameterExpression>(temps), new TrueReadOnlyCollection<Expression>(block));
}
/// <summary>
/// Creates a new expression that is like this one, but using the
/// supplied children. If all of the children are the same, it will
/// return this expression.
/// </summary>
/// <param name="operand">The <see cref="Operand" /> property of the result.</param>
/// <returns>This expression if no children changed, or an expression with the updated children.</returns>
public UnaryExpression Update(Expression operand) {
if (operand == Operand) {
return this;
}
return Expression.MakeUnary(NodeType, operand, Type, Method);
}
}
public partial class Expression {
/// <summary>
/// Creates a <see cref="UnaryExpression"></see>, given an operand, by calling the appropriate factory method.
/// </summary>
/// <param name="unaryType">The <see cref="ExpressionType"></see> that specifies the type of unary operation.</param>
/// <param name="operand">An <see cref="Expression"></see> that represents the operand.</param>
/// <param name="type">The <see cref="Type"></see> that specifies the type to be converted to (pass null if not applicable).</param>
/// <returns>The <see cref="UnaryExpression"></see> that results from calling the appropriate factory method.</returns>
/// <exception cref="ArgumentException">Thrown when <paramref name="unaryType"/> does not correspond to a unary expression.</exception>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="operand"/> is null.</exception>
public static UnaryExpression MakeUnary(ExpressionType unaryType, Expression operand, Type type) {
return MakeUnary(unaryType, operand, type, null);
}
/// <summary>
/// Creates a <see cref="UnaryExpression"></see>, given an operand and implementing method, by calling the appropriate factory method.
/// </summary>
/// <param name="unaryType">The <see cref="ExpressionType"></see> that specifies the type of unary operation.</param>
/// <param name="operand">An <see cref="Expression"></see> that represents the operand.</param>
/// <param name="type">The <see cref="Type"></see> that specifies the type to be converted to (pass null if not applicable).</param>
/// <param name="method">The <see cref="MethodInfo"></see> that represents the implementing method.</param>
/// <returns>The <see cref="UnaryExpression"></see> that results from calling the appropriate factory method.</returns>
/// <exception cref="ArgumentException">Thrown when <paramref name="unaryType"/> does not correspond to a unary expression.</exception>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="operand"/> is null.</exception>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Maintainability", "CA1502:AvoidExcessiveComplexity")]
public static UnaryExpression MakeUnary(ExpressionType unaryType, Expression operand, Type type, MethodInfo method) {
switch (unaryType) {
case ExpressionType.Negate:
return Negate(operand, method);
case ExpressionType.NegateChecked:
return NegateChecked(operand, method);
case ExpressionType.Not:
return Not(operand, method);
case ExpressionType.IsFalse:
return IsFalse(operand, method);
case ExpressionType.IsTrue:
return IsTrue(operand, method);
case ExpressionType.OnesComplement:
return OnesComplement(operand, method);
case ExpressionType.ArrayLength:
return ArrayLength(operand);
case ExpressionType.Convert:
return Convert(operand, type, method);
case ExpressionType.ConvertChecked:
return ConvertChecked(operand, type, method);
case ExpressionType.Throw:
return Throw(operand, type);
case ExpressionType.TypeAs:
return TypeAs(operand, type);
case ExpressionType.Quote:
return Quote(operand);
case ExpressionType.UnaryPlus:
return UnaryPlus(operand, method);
case ExpressionType.Unbox:
return Unbox(operand, type);
case ExpressionType.Increment:
return Increment(operand, method);
case ExpressionType.Decrement:
return Decrement(operand, method);
case ExpressionType.PreIncrementAssign:
return PreIncrementAssign(operand, method);
case ExpressionType.PostIncrementAssign:
return PostIncrementAssign(operand, method);
case ExpressionType.PreDecrementAssign:
return PreDecrementAssign(operand, method);
case ExpressionType.PostDecrementAssign:
return PostDecrementAssign(operand, method);
default:
throw Error.UnhandledUnary(unaryType);
}
}
private static UnaryExpression GetUserDefinedUnaryOperatorOrThrow(ExpressionType unaryType, string name, Expression operand) {
UnaryExpression u = GetUserDefinedUnaryOperator(unaryType, name, operand);
if (u != null) {
ValidateParamswithOperandsOrThrow(u.Method.GetParametersCached()[0].ParameterType, operand.Type, unaryType, name);
return u;
}
throw Error.UnaryOperatorNotDefined(unaryType, operand.Type);
}
private static UnaryExpression GetUserDefinedUnaryOperator(ExpressionType unaryType, string name, Expression operand) {
Type operandType = operand.Type;
Type[] types = new Type[] { operandType };
Type nnOperandType = TypeUtils.GetNonNullableType(operandType);
BindingFlags flags = BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic;
MethodInfo method = nnOperandType.GetMethodValidated(name, flags, null, types, null);
if (method != null) {
return new UnaryExpression(unaryType, operand, method.ReturnType, method);
}
// try lifted call
if (TypeUtils.IsNullableType(operandType)) {
types[0] = nnOperandType;
method = nnOperandType.GetMethodValidated(name, flags, null, types, null);
if (method != null && method.ReturnType.IsValueType && !TypeUtils.IsNullableType(method.ReturnType)) {
return new UnaryExpression(unaryType, operand, TypeUtils.GetNullableType(method.ReturnType), method);
}
}
return null;
}
private static UnaryExpression GetMethodBasedUnaryOperator(ExpressionType unaryType, Expression operand, MethodInfo method) {
System.Diagnostics.Debug.Assert(method != null);
ValidateOperator(method);
ParameterInfo[] pms = method.GetParametersCached();
if (pms.Length != 1)
throw Error.IncorrectNumberOfMethodCallArguments(method);
if (ParameterIsAssignable(pms[0], operand.Type)) {
ValidateParamswithOperandsOrThrow(pms[0].ParameterType, operand.Type, unaryType, method.Name);
return new UnaryExpression(unaryType, operand, method.ReturnType, method);
}
// check for lifted call
if (TypeUtils.IsNullableType(operand.Type) &&
ParameterIsAssignable(pms[0], TypeUtils.GetNonNullableType(operand.Type)) &&
method.ReturnType.IsValueType && !TypeUtils.IsNullableType(method.ReturnType)) {
return new UnaryExpression(unaryType, operand, TypeUtils.GetNullableType(method.ReturnType), method);
}
throw Error.OperandTypesDoNotMatchParameters(unaryType, method.Name);
}
private static UnaryExpression GetUserDefinedCoercionOrThrow(ExpressionType coercionType, Expression expression, Type convertToType) {
UnaryExpression u = GetUserDefinedCoercion(coercionType, expression, convertToType);
if (u != null) {
return u;
}
throw Error.CoercionOperatorNotDefined(expression.Type, convertToType);
}
private static UnaryExpression GetUserDefinedCoercion(ExpressionType coercionType, Expression expression, Type convertToType) {
MethodInfo method = TypeUtils.GetUserDefinedCoercionMethod(expression.Type, convertToType, false);
if (method != null) {
return new UnaryExpression(coercionType, expression, convertToType, method);
} else {
return null;
}
}
private static UnaryExpression GetMethodBasedCoercionOperator(ExpressionType unaryType, Expression operand, Type convertToType, MethodInfo method) {
System.Diagnostics.Debug.Assert(method != null);
ValidateOperator(method);
ParameterInfo[] pms = method.GetParametersCached();
if (pms.Length != 1) {
throw Error.IncorrectNumberOfMethodCallArguments(method);
}
if (ParameterIsAssignable(pms[0], operand.Type) && TypeUtils.AreEquivalent(method.ReturnType, convertToType)) {
return new UnaryExpression(unaryType, operand, method.ReturnType, method);
}
// check for lifted call
if ((TypeUtils.IsNullableType(operand.Type) || TypeUtils.IsNullableType(convertToType)) &&
ParameterIsAssignable(pms[0], TypeUtils.GetNonNullableType(operand.Type)) &&
TypeUtils.AreEquivalent(method.ReturnType, TypeUtils.GetNonNullableType(convertToType))) {
return new UnaryExpression(unaryType, operand, convertToType, method);
}
throw Error.OperandTypesDoNotMatchParameters(unaryType, method.Name);
}
/// <summary>
/// Creates a <see cref="UnaryExpression"></see> that represents an arithmetic negation operation.
/// </summary>
/// <param name="expression">An <see cref="Expression"></see> to set the <see cref="P:UnaryExpression.Operand"></see> property equal to.</param>
/// <returns>A <see cref="UnaryExpression"></see> that has the <see cref="P:Expression.NodeType"></see> property equal to <see cref="P:ExpressionType.Negate"></see> and the <see cref="P:UnaryExpression.Operand"></see> properties set to the specified value.</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="expression"/> is null.</exception>
/// <exception cref="InvalidOperationException">Thrown when the unary minus operator is not defined for <see cref="P:Expression.Type"></see></exception>
public static UnaryExpression Negate(Expression expression) {
return Negate(expression, null);
}
/// <summary>
/// Creates a <see cref="UnaryExpression"></see> that represents an arithmetic negation operation.
/// </summary>
/// <param name="expression">An <see cref="Expression"></see> to set the <see cref="P:UnaryExpression.Operand"></see> property equal to.</param>
/// <param name="method">A <see cref="MethodInfo"></see> to set the <see cref="P:UnaryExpression.Method"></see> property equal to.</param>
/// <returns>A <see cref="UnaryExpression"></see> that has the <see cref="P:Expression.NodeType"></see> property equal to <see cref="P:ExpressionType.Negate"></see> and the <see cref="P:UnaryExpression.Operand"></see> and <see cref="P:UnaryExpression.Method"></see> properties set to the specified value.</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="expression"/> is null.</exception>
/// <exception cref="ArgumentException">Thrown when <paramref name="method"/> is not null and the method it represents returns void, is not static (Shared in Visual Basic), or does not take exactly one argument.</exception>
/// <exception cref="InvalidOperationException">Thown when <paramref name="method"/> is null and the unary minus operator is not defined for expression.Type or expression.Type (or its corresponding non-nullable type if it is a nullable value type) is not assignable to the argument type of the method represented by method.</exception>
public static UnaryExpression Negate(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type) && !TypeUtils.IsUnsignedInt(expression.Type)) {
return new UnaryExpression(ExpressionType.Negate, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.Negate, "op_UnaryNegation", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.Negate, expression, method);
}
/// <summary>
/// Creates a <see cref="UnaryExpression"></see> that represents a unary plus operation.
/// </summary>
/// <param name="expression">An <see cref="Expression"></see> to set the <see cref="UnaryExpression.Operand"></see> property equal to.</param>
/// <returns>A <see cref="UnaryExpression"></see> that has the <see cref="Expression.NodeType"></see> property equal to <see cref="ExpressionType.UnaryPlus"></see> and the <see cref="UnaryExpression.Operand"></see> property set to the specified value.</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="expression"/> is null.</exception>
/// <exception cref="InvalidOperationException">Thown when the unary minus operator is not defined for expression.Type.</exception>
public static UnaryExpression UnaryPlus(Expression expression) {
return UnaryPlus(expression, null);
}
/// <summary>
/// Creates a <see cref="UnaryExpression"></see> that represents a unary plus operation.
/// </summary>
/// <param name="expression">An <see cref="Expression"></see> to set the <see cref="UnaryExpression.Operand"></see> property equal to.</param>
/// <param name="method">A <see cref="MethodInfo"></see> to set the <see cref="UnaryExpression.Method"></see> property equal to.</param>
/// <returns>A <see cref="UnaryExpression"></see> that has the <see cref="Expression.NodeType"></see> property equal to <see cref="ExpressionType.UnaryPlus"></see> and the <see cref="UnaryExpression.Operand"></see> and <see cref="UnaryExpression.Method"></see>property set to the specified value.</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="expression"/> is null.</exception>
/// <exception cref="ArgumentException">Thrown when <paramref name="method"/> is not null and the method it represents returns void, is not static (Shared in Visual Basic), or does not take exactly one argument.</exception>
/// <exception cref="InvalidOperationException">Thown when <paramref name="method"/> is null and the unary minus operator is not defined for expression.Type or expression.Type (or its corresponding non-nullable type if it is a nullable value type) is not assignable to the argument type of the method represented by method.</exception>
public static UnaryExpression UnaryPlus(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type)) {
return new UnaryExpression(ExpressionType.UnaryPlus, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.UnaryPlus, "op_UnaryPlus", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.UnaryPlus, expression, method);
}
/// <summary>Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents an arithmetic negation operation that has overflow checking.</summary>
/// <returns>A <see cref="T:System.Linq.Expressions.UnaryExpression" /> that has the <see cref="P:System.Linq.Expressions.Expression.NodeType" /> property equal to <see cref="F:System.Linq.Expressions.ExpressionType.NegateChecked" /> and the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> property set to the specified value.</returns>
/// <param name="expression">An <see cref="T:System.Linq.Expressions.Expression" /> to set the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> property equal to.</param>
/// <exception cref="T:System.ArgumentNullException">
/// Thrown when <paramref name="expression" /> is null.</exception>
/// <exception cref="T:System.InvalidOperationException">Thrown when the unary minus operator is not defined for <paramref name="expression" />.Type.</exception>
public static UnaryExpression NegateChecked(Expression expression) {
return NegateChecked(expression, null);
}
///<summary>Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents an arithmetic negation operation that has overflow checking. The implementing method can be specified.</summary>
///<returns>A <see cref="T:System.Linq.Expressions.UnaryExpression" /> that has the <see cref="P:System.Linq.Expressions.Expression.NodeType" /> property equal to <see cref="F:System.Linq.Expressions.ExpressionType.NegateChecked" /> and the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> and <see cref="P:System.Linq.Expressions.UnaryExpression.Method" /> properties set to the specified values.</returns>
///<param name="expression">An <see cref="T:System.Linq.Expressions.Expression" /> to set the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> property equal to.</param>
///<param name="method">A <see cref="T:System.Reflection.MethodInfo" /> to set the <see cref="P:System.Linq.Expressions.UnaryExpression.Method" /> property equal to.</param>
///<exception cref="T:System.ArgumentNullException">
///<paramref name="expression" /> is null.</exception>
///<exception cref="T:System.ArgumentException">
///<paramref name="method" /> is not null and the method it represents returns void, is not static (Shared in Visual Basic), or does not take exactly one argument.</exception>
///<exception cref="T:System.InvalidOperationException">
///<paramref name="method" /> is null and the unary minus operator is not defined for <paramref name="expression" />.Type.-or-<paramref name="expression" />.Type (or its corresponding non-nullable type if it is a nullable value type) is not assignable to the argument type of the method represented by <paramref name="method" />.</exception>
public static UnaryExpression NegateChecked(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type) && !TypeUtils.IsUnsignedInt(expression.Type)) {
return new UnaryExpression(ExpressionType.NegateChecked, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.NegateChecked, "op_UnaryNegation", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.NegateChecked, expression, method);
}
///<summary>Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents a bitwise complement operation.</summary>
///<returns>A <see cref="T:System.Linq.Expressions.UnaryExpression" /> that has the <see cref="P:System.Linq.Expressions.Expression.NodeType" /> property equal to <see cref="F:System.Linq.Expressions.ExpressionType.Not" /> and the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> property set to the specified value.</returns>
///<param name="expression">An <see cref="T:System.Linq.Expressions.Expression" /> to set the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> property equal to.</param>
///<exception cref="T:System.ArgumentNullException">
///<paramref name="expression" /> is null.</exception>
///<exception cref="T:System.InvalidOperationException">The unary not operator is not defined for <paramref name="expression" />.Type.</exception>
public static UnaryExpression Not(Expression expression) {
return Not(expression, null);
}
///<summary>Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents a bitwise complement operation. The implementing method can be specified.</summary>
///<returns>A <see cref="T:System.Linq.Expressions.UnaryExpression" /> that has the <see cref="P:System.Linq.Expressions.Expression.NodeType" /> property equal to <see cref="F:System.Linq.Expressions.ExpressionType.Not" /> and the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> and <see cref="P:System.Linq.Expressions.UnaryExpression.Method" /> properties set to the specified values.</returns>
///<param name="expression">An <see cref="T:System.Linq.Expressions.Expression" /> to set the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> property equal to.</param>
///<param name="method">A <see cref="T:System.Reflection.MethodInfo" /> to set the <see cref="P:System.Linq.Expressions.UnaryExpression.Method" /> property equal to.</param>
///<exception cref="T:System.ArgumentNullException">
///<paramref name="expression" /> is null.</exception>
///<exception cref="T:System.ArgumentException">
///<paramref name="method" /> is not null and the method it represents returns void, is not static (Shared in Visual Basic), or does not take exactly one argument.</exception>
///<exception cref="T:System.InvalidOperationException">
///<paramref name="method" /> is null and the unary not operator is not defined for <paramref name="expression" />.Type.-or-<paramref name="expression" />.Type (or its corresponding non-nullable type if it is a nullable value type) is not assignable to the argument type of the method represented by <paramref name="method" />.</exception>
public static UnaryExpression Not(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsIntegerOrBool(expression.Type)) {
return new UnaryExpression(ExpressionType.Not, expression, expression.Type, null);
}
UnaryExpression u = GetUserDefinedUnaryOperator(ExpressionType.Not, "op_LogicalNot", expression);
if (u != null) {
return u;
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.Not, "op_OnesComplement", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.Not, expression, method);
}
/// <summary>
/// Returns whether the expression evaluates to false.
/// </summary>
/// <param name="expression">An <see cref="T:System.Linq.Expressions.Expression" /> to evaluate.</param>
/// <returns>An instance of <see cref="UnaryExpression"/>.</returns>
public static UnaryExpression IsFalse(Expression expression) {
return IsFalse(expression, null);
}
/// <summary>
/// Returns whether the expression evaluates to false.
/// </summary>
///<param name="expression">An <see cref="T:System.Linq.Expressions.Expression" /> to evaluate.</param>
///<param name="method">A <see cref="T:System.Reflection.MethodInfo" /> that represents the implementing method.</param>
/// <returns>An instance of <see cref="UnaryExpression"/>.</returns>
public static UnaryExpression IsFalse(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsBool(expression.Type)) {
return new UnaryExpression(ExpressionType.IsFalse, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.IsFalse, "op_False", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.IsFalse, expression, method);
}
/// <summary>
/// Returns whether the expression evaluates to true.
/// </summary>
/// <param name="expression">An <see cref="T:System.Linq.Expressions.Expression" /> to evaluate.</param>
/// <returns>An instance of <see cref="UnaryExpression"/>.</returns>
public static UnaryExpression IsTrue(Expression expression) {
return IsTrue(expression, null);
}
/// <summary>
/// Returns whether the expression evaluates to true.
/// </summary>
///<param name="expression">An <see cref="T:System.Linq.Expressions.Expression" /> to evaluate.</param>
///<param name="method">A <see cref="T:System.Reflection.MethodInfo" /> that represents the implementing method.</param>
/// <returns>An instance of <see cref="UnaryExpression"/>.</returns>
public static UnaryExpression IsTrue(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsBool(expression.Type)) {
return new UnaryExpression(ExpressionType.IsTrue, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.IsTrue, "op_True", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.IsTrue, expression, method);
}
/// <summary>
/// Returns the expression representing the ones complement.
/// </summary>
///<param name="expression">An <see cref="T:System.Linq.Expressions.Expression" />.</param>
/// <returns>An instance of <see cref="UnaryExpression"/>.</returns>
public static UnaryExpression OnesComplement(Expression expression) {
return OnesComplement(expression, null);
}
/// <summary>
/// Returns the expression representing the ones complement.
/// </summary>
/// <param name="expression">An <see cref="T:System.Linq.Expressions.Expression" />.</param>
/// <param name="method">A <see cref="T:System.Reflection.MethodInfo" /> that represents the implementing method.</param>
/// <returns>An instance of <see cref="UnaryExpression"/>.</returns>
public static UnaryExpression OnesComplement(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsInteger(expression.Type)) {
return new UnaryExpression(ExpressionType.OnesComplement, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.OnesComplement, "op_OnesComplement", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.OnesComplement, expression, method);
}
///<summary>Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents an explicit reference or boxing conversion where null is supplied if the conversion fails.</summary>
///<returns>A <see cref="T:System.Linq.Expressions.UnaryExpression" /> that has the <see cref="P:System.Linq.Expressions.Expression.NodeType" /> property equal to <see cref="F:System.Linq.Expressions.ExpressionType.TypeAs" /> and the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> and <see cref="P:System.Linq.Expressions.Expression.Type" /> properties set to the specified values.</returns>
///<param name="expression">An <see cref="T:System.Linq.Expressions.Expression" /> to set the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> property equal to.</param>
///<param name="type">A <see cref="T:System.Type" /> to set the <see cref="P:System.Linq.Expressions.Expression.Type" /> property equal to.</param>
///<exception cref="T:System.ArgumentNullException">
///<paramref name="expression" /> or <paramref name="type" /> is null.</exception>
public static UnaryExpression TypeAs(Expression expression, Type type) {
RequiresCanRead(expression, "expression");
ContractUtils.RequiresNotNull(type, "type");
TypeUtils.ValidateType(type);
if (type.IsValueType && !TypeUtils.IsNullableType(type)) {
throw Error.IncorrectTypeForTypeAs(type);
}
return new UnaryExpression(ExpressionType.TypeAs, expression, type, null);
}
/// <summary>
/// <summary>Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents an explicit unboxing.</summary>
/// </summary>
/// <param name="expression">An <see cref="T:System.Linq.Expressions.Expression" /> to unbox.</param>
/// <param name="type">The new <see cref="T:System.Type" /> of the expression.</param>
/// <returns>An instance of <see cref="UnaryExpression"/>.</returns>
public static UnaryExpression Unbox(Expression expression, Type type) {
RequiresCanRead(expression, "expression");
ContractUtils.RequiresNotNull(type, "type");
if (!expression.Type.IsInterface && expression.Type != typeof(object)) {
throw Error.InvalidUnboxType();
}
if (!type.IsValueType) throw Error.InvalidUnboxType();
TypeUtils.ValidateType(type);
return new UnaryExpression(ExpressionType.Unbox, expression, type, null);
}
///<summary>Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents a conversion operation.</summary>
///<returns>A <see cref="T:System.Linq.Expressions.UnaryExpression" /> that has the <see cref="P:System.Linq.Expressions.Expression.NodeType" /> property equal to <see cref="F:System.Linq.Expressions.ExpressionType.Convert" /> and the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> and <see cref="P:System.Linq.Expressions.Expression.Type" /> properties set to the specified values.</returns>
///<param name="expression">An <see cref="T:System.Linq.Expressions.Expression" /> to set the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> property equal to.</param>
///<param name="type">A <see cref="T:System.Type" /> to set the <see cref="P:System.Linq.Expressions.Expression.Type" /> property equal to.</param>
///<exception cref="T:System.ArgumentNullException">
///<paramref name="expression" /> or <paramref name="type" /> is null.</exception>
///<exception cref="T:System.InvalidOperationException">No conversion operator is defined between <paramref name="expression" />.Type and <paramref name="type" />.</exception>
public static UnaryExpression Convert(Expression expression, Type type) {
return Convert(expression, type, null);
}
///<summary>Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents a conversion operation for which the implementing method is specified.</summary>
///<returns>A <see cref="T:System.Linq.Expressions.UnaryExpression" /> that has the <see cref="P:System.Linq.Expressions.Expression.NodeType" /> property equal to <see cref="F:System.Linq.Expressions.ExpressionType.Convert" /> and the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" />, <see cref="P:System.Linq.Expressions.Expression.Type" />, and <see cref="P:System.Linq.Expressions.UnaryExpression.Method" /> properties set to the specified values.</returns>
///<param name="expression">An <see cref="T:System.Linq.Expressions.Expression" /> to set the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> property equal to.</param>
///<param name="type">A <see cref="T:System.Type" /> to set the <see cref="P:System.Linq.Expressions.Expression.Type" /> property equal to.</param>
///<param name="method">A <see cref="T:System.Reflection.MethodInfo" /> to set the <see cref="P:System.Linq.Expressions.UnaryExpression.Method" /> property equal to.</param>
///<exception cref="T:System.ArgumentNullException">
///<paramref name="expression" /> or <paramref name="type" /> is null.</exception>
///<exception cref="T:System.ArgumentException">
///<paramref name="method" /> is not null and the method it represents returns void, is not static (Shared in Visual Basic), or does not take exactly one argument.</exception>
///<exception cref="T:System.Reflection.AmbiguousMatchException">More than one method that matches the <paramref name="method" /> description was found.</exception>
///<exception cref="T:System.InvalidOperationException">No conversion operator is defined between <paramref name="expression" />.Type and <paramref name="type" />.-or-<paramref name="expression" />.Type is not assignable to the argument type of the method represented by <paramref name="method" />.-or-The return type of the method represented by <paramref name="method" /> is not assignable to <paramref name="type" />.-or-<paramref name="expression" />.Type or <paramref name="type" /> is a nullable value type and the corresponding non-nullable value type does not equal the argument type or the return type, respectively, of the method represented by <paramref name="method" />.</exception>
public static UnaryExpression Convert(Expression expression, Type type, MethodInfo method) {
RequiresCanRead(expression, "expression");
ContractUtils.RequiresNotNull(type, "type");
TypeUtils.ValidateType(type);
if (method == null) {
if (TypeUtils.HasIdentityPrimitiveOrNullableConversion(expression.Type, type) ||
TypeUtils.HasReferenceConversion(expression.Type, type)) {
return new UnaryExpression(ExpressionType.Convert, expression, type, null);
}
return GetUserDefinedCoercionOrThrow(ExpressionType.Convert, expression, type);
}
return GetMethodBasedCoercionOperator(ExpressionType.Convert, expression, type, method);
}
///<summary>Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents a conversion operation that throws an exception if the target type is overflowed.</summary>
///<returns>A <see cref="T:System.Linq.Expressions.UnaryExpression" /> that has the <see cref="P:System.Linq.Expressions.Expression.NodeType" /> property equal to <see cref="F:System.Linq.Expressions.ExpressionType.ConvertChecked" /> and the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> and <see cref="P:System.Linq.Expressions.Expression.Type" /> properties set to the specified values.</returns>
///<param name="expression">An <see cref="T:System.Linq.Expressions.Expression" /> to set the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> property equal to.</param>
///<param name="type">A <see cref="T:System.Type" /> to set the <see cref="P:System.Linq.Expressions.Expression.Type" /> property equal to.</param>
///<exception cref="T:System.ArgumentNullException">
///<paramref name="expression" /> or <paramref name="type" /> is null.</exception>
///<exception cref="T:System.InvalidOperationException">No conversion operator is defined between <paramref name="expression" />.Type and <paramref name="type" />.</exception>
public static UnaryExpression ConvertChecked(Expression expression, Type type) {
return ConvertChecked(expression, type, null);
}
///<summary>Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents a conversion operation that throws an exception if the target type is overflowed and for which the implementing method is specified.</summary>
///<returns>A <see cref="T:System.Linq.Expressions.UnaryExpression" /> that has the <see cref="P:System.Linq.Expressions.Expression.NodeType" /> property equal to <see cref="F:System.Linq.Expressions.ExpressionType.ConvertChecked" /> and the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" />, <see cref="P:System.Linq.Expressions.Expression.Type" />, and <see cref="P:System.Linq.Expressions.UnaryExpression.Method" /> properties set to the specified values.</returns>
///<param name="expression">An <see cref="T:System.Linq.Expressions.Expression" /> to set the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> property equal to.</param>
///<param name="type">A <see cref="T:System.Type" /> to set the <see cref="P:System.Linq.Expressions.Expression.Type" /> property equal to.</param>
///<param name="method">A <see cref="T:System.Reflection.MethodInfo" /> to set the <see cref="P:System.Linq.Expressions.UnaryExpression.Method" /> property equal to.</param>
///<exception cref="T:System.ArgumentNullException">
///<paramref name="expression" /> or <paramref name="type" /> is null.</exception>
///<exception cref="T:System.ArgumentException">
///<paramref name="method" /> is not null and the method it represents returns void, is not static (Shared in Visual Basic), or does not take exactly one argument.</exception>
///<exception cref="T:System.Reflection.AmbiguousMatchException">More than one method that matches the <paramref name="method" /> description was found.</exception>
///<exception cref="T:System.InvalidOperationException">No conversion operator is defined between <paramref name="expression" />.Type and <paramref name="type" />.-or-<paramref name="expression" />.Type is not assignable to the argument type of the method represented by <paramref name="method" />.-or-The return type of the method represented by <paramref name="method" /> is not assignable to <paramref name="type" />.-or-<paramref name="expression" />.Type or <paramref name="type" /> is a nullable value type and the corresponding non-nullable value type does not equal the argument type or the return type, respectively, of the method represented by <paramref name="method" />.</exception>
public static UnaryExpression ConvertChecked(Expression expression, Type type, MethodInfo method) {
RequiresCanRead(expression, "expression");
ContractUtils.RequiresNotNull(type, "type");
TypeUtils.ValidateType(type);
if (method == null) {
if (TypeUtils.HasIdentityPrimitiveOrNullableConversion(expression.Type, type)) {
return new UnaryExpression(ExpressionType.ConvertChecked, expression, type, null);
}
if (TypeUtils.HasReferenceConversion(expression.Type, type)) {
return new UnaryExpression(ExpressionType.Convert, expression, type, null);
}
return GetUserDefinedCoercionOrThrow(ExpressionType.ConvertChecked, expression, type);
}
return GetMethodBasedCoercionOperator(ExpressionType.ConvertChecked, expression, type, method);
}
///<summary>Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents getting the length of a one-dimensional array.</summary>
///<returns>A <see cref="T:System.Linq.Expressions.UnaryExpression" /> that has the <see cref="P:System.Linq.Expressions.Expression.NodeType" /> property equal to <see cref="F:System.Linq.Expressions.ExpressionType.ArrayLength" /> and the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> property equal to <paramref name="array" />.</returns>
///<param name="array">An <see cref="T:System.Linq.Expressions.Expression" /> to set the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> property equal to.</param>
///<exception cref="T:System.ArgumentNullException">
///<paramref name="array" /> is null.</exception>
///<exception cref="T:System.ArgumentException">
///<paramref name="array" />.Type does not represent an array type.</exception>
public static UnaryExpression ArrayLength(Expression array) {
ContractUtils.RequiresNotNull(array, "array");
if (!array.Type.IsArray || !typeof(Array).IsAssignableFrom(array.Type)) {
throw Error.ArgumentMustBeArray();
}
if (array.Type.GetArrayRank() != 1) {
throw Error.ArgumentMustBeSingleDimensionalArrayType();
}
return new UnaryExpression(ExpressionType.ArrayLength, array, typeof(int), null);
}
///<summary>Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents an expression that has a constant value of type <see cref="T:System.Linq.Expressions.Expression" />.</summary>
///<returns>A <see cref="T:System.Linq.Expressions.UnaryExpression" /> that has the <see cref="P:System.Linq.Expressions.Expression.NodeType" /> property equal to <see cref="F:System.Linq.Expressions.ExpressionType.Quote" /> and the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> property set to the specified value.</returns>
///<param name="expression">An <see cref="T:System.Linq.Expressions.Expression" /> to set the <see cref="P:System.Linq.Expressions.UnaryExpression.Operand" /> property equal to.</param>
///<exception cref="T:System.ArgumentNullException">
///<paramref name="expression" /> is null.</exception>
public static UnaryExpression Quote(Expression expression) {
RequiresCanRead(expression, "expression");
if (!(expression is LambdaExpression)) throw Error.QuotedExpressionMustBeLambda();
return new UnaryExpression(ExpressionType.Quote, expression, expression.GetType(), null);
}
/// <summary>
/// Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents a rethrowing of an exception.
/// </summary>
/// <returns>A <see cref="T:System.Linq.Expressions.UnaryExpression"/> that represents a rethrowing of an exception.</returns>
public static UnaryExpression Rethrow() {
return Throw(null);
}
/// <summary>
/// Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents a rethrowing of an exception with a given type.
/// </summary>
///<param name="type">The new <see cref="T:System.Type" /> of the expression.</param>
/// <returns>A <see cref="T:System.Linq.Expressions.UnaryExpression"/> that represents a rethrowing of an exception.</returns>
public static UnaryExpression Rethrow(Type type) {
return Throw(null, type);
}
/// <summary>
/// Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents a throwing of an exception.
/// </summary>
/// <param name="value">An <see cref="T:System.Linq.Expressions.Expression" />.</param>
/// <returns>A <see cref="T:System.Linq.Expressions.UnaryExpression"/> that represents the exception.</returns>
public static UnaryExpression Throw(Expression value) {
return Throw(value, typeof(void));
}
/// <summary>
/// Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents a throwing of a value with a given type.
/// </summary>
/// <param name="value">An <see cref="T:System.Linq.Expressions.Expression" />.</param>
/// <param name="type">The new <see cref="T:System.Type" /> of the expression.</param>
/// <returns>A <see cref="T:System.Linq.Expressions.UnaryExpression"/> that represents the exception.</returns>
public static UnaryExpression Throw(Expression value, Type type) {
ContractUtils.RequiresNotNull(type, "type");
TypeUtils.ValidateType(type);
if (value != null) {
RequiresCanRead(value, "value");
if (value.Type.IsValueType) throw Error.ArgumentMustNotHaveValueType();
}
return new UnaryExpression(ExpressionType.Throw, value, type, null);
}
/// <summary>
/// Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents the incrementing of the expression by 1.
/// </summary>
/// <param name="expression">An <see cref="T:System.Linq.Expressions.Expression"></see> to increment.</param>
/// <returns>A <see cref="T:System.Linq.Expressions.UnaryExpression"/> that represents the incremented expression.</returns>
public static UnaryExpression Increment(Expression expression) {
return Increment(expression, null);
}
/// <summary>
/// Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents the incrementing of the expression by 1.
/// </summary>
/// <param name="expression">An <see cref="T:System.Linq.Expressions.Expression"></see> to increment.</param>
///<param name="method">A <see cref="T:System.Reflection.MethodInfo" /> that represents the implementing method.</param>
/// <returns>A <see cref="T:System.Linq.Expressions.UnaryExpression"/> that represents the incremented expression.</returns>
public static UnaryExpression Increment(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type)) {
return new UnaryExpression(ExpressionType.Increment, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.Increment, "op_Increment", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.Increment, expression, method);
}
/// <summary>
/// Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents the decrementing of the expression by 1.
/// </summary>
/// <param name="expression">An <see cref="T:System.Linq.Expressions.Expression"></see> to decrement.</param>
/// <returns>A <see cref="T:System.Linq.Expressions.UnaryExpression"/> that represents the decremented expression.</returns>
public static UnaryExpression Decrement(Expression expression) {
return Decrement(expression, null);
}
/// <summary>
/// Creates a <see cref="T:System.Linq.Expressions.UnaryExpression" /> that represents the decrementing of the expression by 1.
/// </summary>
/// <param name="expression">An <see cref="T:System.Linq.Expressions.Expression"></see> to decrement.</param>
///<param name="method">A <see cref="T:System.Reflection.MethodInfo" /> that represents the implementing method.</param>
/// <returns>A <see cref="T:System.Linq.Expressions.UnaryExpression"/> that represents the decremented expression.</returns>
public static UnaryExpression Decrement(Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type)) {
return new UnaryExpression(ExpressionType.Decrement, expression, expression.Type, null);
}
return GetUserDefinedUnaryOperatorOrThrow(ExpressionType.Decrement, "op_Decrement", expression);
}
return GetMethodBasedUnaryOperator(ExpressionType.Decrement, expression, method);
}
/// <summary>
/// Creates a <see cref="UnaryExpression"/> that increments the expression by 1
/// and assigns the result back to the expression.
/// </summary>
/// <param name="expression">An <see cref="T:System.Linq.Expressions.Expression"></see> to apply the operations on.</param>
/// <returns>A <see cref="T:System.Linq.Expressions.UnaryExpression"/> that represents the resultant expression.</returns>
public static UnaryExpression PreIncrementAssign(Expression expression) {
return MakeOpAssignUnary(ExpressionType.PreIncrementAssign, expression, null);
}
/// <summary>
/// Creates a <see cref="UnaryExpression"/> that increments the expression by 1
/// and assigns the result back to the expression.
/// </summary>
/// <param name="expression">An <see cref="T:System.Linq.Expressions.Expression"></see> to apply the operations on.</param>
/// <param name="method">A <see cref="T:System.Reflection.MethodInfo" /> that represents the implementing method.</param>
/// <returns>A <see cref="T:System.Linq.Expressions.UnaryExpression"/> that represents the resultant expression.</returns>
public static UnaryExpression PreIncrementAssign(Expression expression, MethodInfo method) {
return MakeOpAssignUnary(ExpressionType.PreIncrementAssign, expression, method);
}
/// <summary>
/// Creates a <see cref="UnaryExpression"/> that decrements the expression by 1
/// and assigns the result back to the expression.
/// </summary>
/// <param name="expression">An <see cref="T:System.Linq.Expressions.Expression"></see> to apply the operations on.</param>
/// <returns>A <see cref="T:System.Linq.Expressions.UnaryExpression"/> that represents the resultant expression.</returns>
public static UnaryExpression PreDecrementAssign(Expression expression) {
return MakeOpAssignUnary(ExpressionType.PreDecrementAssign, expression, null);
}
/// <summary>
/// Creates a <see cref="UnaryExpression"/> that decrements the expression by 1
/// and assigns the result back to the expression.
/// </summary>
/// <param name="expression">An <see cref="T:System.Linq.Expressions.Expression"></see> to apply the operations on.</param>
/// <param name="method">A <see cref="T:System.Reflection.MethodInfo" /> that represents the implementing method.</param>
/// <returns>A <see cref="T:System.Linq.Expressions.UnaryExpression"/> that represents the resultant expression.</returns>
public static UnaryExpression PreDecrementAssign(Expression expression, MethodInfo method) {
return MakeOpAssignUnary(ExpressionType.PreDecrementAssign, expression, method);
}
/// <summary>
/// Creates a <see cref="UnaryExpression"/> that represents the assignment of the expression
/// followed by a subsequent increment by 1 of the original expression.
/// </summary>
/// <param name="expression">An <see cref="T:System.Linq.Expressions.Expression"></see> to apply the operations on.</param>
/// <returns>A <see cref="T:System.Linq.Expressions.UnaryExpression"/> that represents the resultant expression.</returns>
public static UnaryExpression PostIncrementAssign(Expression expression) {
return MakeOpAssignUnary(ExpressionType.PostIncrementAssign, expression, null);
}
/// <summary>
/// Creates a <see cref="UnaryExpression"/> that represents the assignment of the expression
/// followed by a subsequent increment by 1 of the original expression.
/// </summary>
/// <param name="expression">An <see cref="T:System.Linq.Expressions.Expression"></see> to apply the operations on.</param>
/// <param name="method">A <see cref="T:System.Reflection.MethodInfo" /> that represents the implementing method.</param>
/// <returns>A <see cref="T:System.Linq.Expressions.UnaryExpression"/> that represents the resultant expression.</returns>
public static UnaryExpression PostIncrementAssign(Expression expression, MethodInfo method) {
return MakeOpAssignUnary(ExpressionType.PostIncrementAssign, expression, method);
}
/// <summary>
/// Creates a <see cref="UnaryExpression"/> that represents the assignment of the expression
/// followed by a subsequent decrement by 1 of the original expression.
/// </summary>
/// <param name="expression">An <see cref="T:System.Linq.Expressions.Expression"></see> to apply the operations on.</param>
/// <returns>A <see cref="T:System.Linq.Expressions.UnaryExpression"/> that represents the resultant expression.</returns>
public static UnaryExpression PostDecrementAssign(Expression expression) {
return MakeOpAssignUnary(ExpressionType.PostDecrementAssign, expression, null);
}
/// <summary>
/// Creates a <see cref="UnaryExpression"/> that represents the assignment of the expression
/// followed by a subsequent decrement by 1 of the original expression.
/// </summary>
/// <param name="expression">An <see cref="T:System.Linq.Expressions.Expression"></see> to apply the operations on.</param>
/// <param name="method">A <see cref="T:System.Reflection.MethodInfo" /> that represents the implementing method.</param>
/// <returns>A <see cref="T:System.Linq.Expressions.UnaryExpression"/> that represents the resultant expression.</returns>
public static UnaryExpression PostDecrementAssign(Expression expression, MethodInfo method) {
return MakeOpAssignUnary(ExpressionType.PostDecrementAssign, expression, method);
}
private static UnaryExpression MakeOpAssignUnary(ExpressionType kind, Expression expression, MethodInfo method) {
RequiresCanRead(expression, "expression");
RequiresCanWrite(expression, "expression");
UnaryExpression result;
if (method == null) {
if (TypeUtils.IsArithmetic(expression.Type)) {
return new UnaryExpression(kind, expression, expression.Type, null);
}
string name;
if (kind == ExpressionType.PreIncrementAssign || kind == ExpressionType.PostIncrementAssign) {
name = "op_Increment";
} else {
name = "op_Decrement";
}
result = GetUserDefinedUnaryOperatorOrThrow(kind, name, expression);
} else {
result = GetMethodBasedUnaryOperator(kind, expression, method);
}
// return type must be assignable back to the operand type
if (!TypeUtils.AreReferenceAssignable(expression.Type, result.Type)) {
throw Error.UserDefinedOpMustHaveValidReturnType(kind, method.Name);
}
return result;
}
}
}
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