本文发表在 rolia.net 枫下论坛I have 4 kinds of asychrous calls methods. I have tested them all.
First one
using System;
public class AsyncMain4
{
// Asynchronous method puts the thread id here.
private static int threadId;
public static void Main(string[] args)
{
// Create an instance of the test class.
AsyncDemo ad = new AsyncDemo();
// Create the delegate.
AsyncDelegate dlgt = new AsyncDelegate(ad.TestMethod);
// Initiate the asychronous call. Include an AsyncCallback
// delegate representing the callback method, and the data
// needed to call EndInvoke.
IAsyncResult ar = dlgt.BeginInvoke(3000,
out threadId,
new AsyncCallback(CallbackMethod),
dlgt );
Console.WriteLine("Press Enter to close application.");
Console.ReadLine();
}
// Callback method must have the same signature as the
// AsyncCallback delegate.
static void CallbackMethod(IAsyncResult ar)
{
// Retrieve the delegate.
AsyncDelegate dlgt = (AsyncDelegate) ar.AsyncState;
// Call EndInvoke to retrieve the results.
string ret = dlgt.EndInvoke(out threadId, ar);
Console.WriteLine("The call executed on thread {0}, with return value \"{1}\".", threadId, ret);
}
}
Second one:
using System;
using System.Threading;
public class AsyncMain1
{
public static void Main(string[] args)
{
// The asynchronous method puts the thread id here.
int threadId;
// Create an instance of the test class.
AsyncDemo ad = new AsyncDemo();
// Create the delegate.
AsyncDelegate dlgt = new AsyncDelegate(ad.TestMethod);
// Initiate the asychronous call.
IAsyncResult ar = dlgt.BeginInvoke(3000, out threadId, null, null);
Thread.Sleep(0);
Console.WriteLine("Main thread {0} does some work.",
AppDomain.GetCurrentThreadId());
// Call EndInvoke to Wait for the asynchronous call to complete,
// and to retrieve the results.
string ret = dlgt.EndInvoke(out threadId, ar);
Console.WriteLine("The call executed on thread {0}, with return value \"{1}\".", threadId, ret);
}
}
third one
using System;
using System.Threading;
public class AsyncMain3
{
public static void Main(string[] args)
{
// The asynchronous method puts the thread id here.
int threadId;
// Create an instance of the test class.
AsyncDemo ad = new AsyncDemo();
// Create the delegate.
AsyncDelegate dlgt = new AsyncDelegate(ad.TestMethod);
// Initiate the asychronous call.
IAsyncResult ar = dlgt.BeginInvoke(3000,
out threadId, null, null);
// Poll while simulating work.
while(ar.IsCompleted == false)
{
Thread.Sleep(10);
}
// Call EndInvoke to retrieve the results.
string ret = dlgt.EndInvoke(out threadId, ar);
Console.WriteLine("The call executed on thread {0}, with return value \"{1}\".", threadId, ret);
}
}
fourth one:
using System;
using System.Threading;
public class AsyncMain2
{
public static void Main(string[] args)
{
// The asynchronous method puts the thread id here.
int threadId;
// Create an instance of the test class.
AsyncDemo ad = new AsyncDemo();
// Create the delegate.
AsyncDelegate dlgt = new AsyncDelegate(ad.TestMethod);
// Initiate the asychronous call.
IAsyncResult ar = dlgt.BeginInvoke(3000,
out threadId, null, null);
Thread.Sleep(0);
Console.WriteLine("Main thread {0} does some work.",
AppDomain.GetCurrentThreadId());
// Wait for the WaitHandle to become signaled.
ar.AsyncWaitHandle.WaitOne();
// Perform additional processing here.
// Call EndInvoke to retrieve the results.
string ret = dlgt.EndInvoke(out threadId, ar);
Console.WriteLine("The call executed on thread {0}, with return value \"{1}\".", threadId, ret);
}
}更多精彩文章及讨论，请光临枫下论坛 rolia.net