/*
A Programmer's Introduction to C# (Second Edition)
by Eric Gunnerson
Publisher: Apress L.P.
ISBN: 1-893115-62-3
*/
// 29 - Threading and Asynchronous Operations\Asynchronous Calls\Return Values
// copyright 2000 Eric Gunnerson
using System;
using System.Threading;
public class AsynchronousCallsReturnValues
{
public static void Main()
{
AsyncCaller ac = new AsyncCaller();
ac.CallMathCallback(new AsyncCaller.MathFunctionToCall(Math.Sin), 0.0, 1.0, 0.2);
Thread.Sleep(2000);
}
}
public class AsyncCaller
{
public delegate double MathFunctionToCall(double arg);
public void MathCallback(IAsyncResult iar)
{
MathFunctionToCall mc = (MathFunctionToCall) iar.AsyncState;
double result = mc.EndInvoke(iar);
Console.WriteLine("Function value = {0}", result);
}
public void CallMathCallback(MathFunctionToCall mathFunc,
double start,
double end,
double increment)
{
AsyncCallback cb = new AsyncCallback(MathCallback);
while (start < end)
{
Console.WriteLine("BeginInvoke: {0}", start);
mathFunc.BeginInvoke(start, cb, mathFunc);
start += increment;
}
}
}
|
