FieldNullValueAttribute.cs :  » Persistence-Frameworks » FileHelpers-Library » FileHelpers » C# / CSharp Open Source

#region "   Copyright 2005-07 to Marcos Meli - http://www.marcosmeli.com.ar" 

// Errors, suggestions, contributions, send a mail to: marcos@filehelpers.com.

#endregion

using System;

namespace FileHelpers{
  /// <summary>Indicates the value to assign to the field in the case of find a "NULL".</summary>
  /// <remarks>See the <a href="attributes.html">Complete Attributes List</a> for more clear info and examples of each one.</remarks>
  /// <seealso href="attributes.html">Attributes List</seealso>
  /// <seealso href="quick_start.html">Quick Start Guide</seealso>
  /// <seealso href="examples.html">Examples of Use</seealso>
  [AttributeUsage(AttributeTargets.Field)]
  public sealed class FieldNullValueAttribute : Attribute
  {
    internal object NullValue;
//    internal bool NullValueOnWrite = false;

    
    /// <summary>Indicates directly the null value.</summary>
    /// <param name="nullValue">The value to assign in the "NULL" case.</param>
    public FieldNullValueAttribute(object nullValue)
    {
      NullValue = nullValue;
//      NullValueOnWrite = useOnWrite;
    }

//    /// <summary>Indicates directly the null value.</summary>
//    /// <param name="nullValue">The value to assign in the "NULL" case.</param>
//    public FieldNullValueAttribute(object nullValue): this(nullValue, false)
//    {}

//    /// <summary>Indicates a type and a string to be converted to that type.</summary>
//    /// <param name="type">The type of the null value.</param>
//    /// <param name="nullValue">The string to be converted to the specified type.</param>
//    /// <param name="useOnWrite">Indicates that if the field has that value when the library writes, then the engine use an empty string.</param>
//    public FieldNullValueAttribute(Type type, string nullValue, bool useOnWrite):this(Convert.ChangeType(nullValue, type, null), useOnWrite)
//    {}

    /// <summary>Indicates a type and a string to be converted to that type.</summary>
    /// <param name="type">The type of the null value.</param>
    /// <param name="nullValue">The string to be converted to the specified type.</param>
    public FieldNullValueAttribute(Type type, string nullValue):this(Convert.ChangeType(nullValue, type, null))
    {}

  }
}