static void Main()
{
// The asynchronous method puts the thread id here.
int threadId;
// Create an instance of the test class
AsyncDemo ad = new AsyncDemo();
// Create the delegate.
AsyncMethodCaller caller = new AsyncMethodCaller(ad.TestMethod);
IAsyncResult result;
#region Using Begin and End Invoke
Console.WriteLine("Beginning solely end invoke method...");
// Initiate the asynchronous call.
result = caller.BeginInvoke(1111, out threadId, null, null);
Thread.Sleep(0);
Console.WriteLine("Main thread {0} does some work.", Thread.CurrentThread.ManagedThreadId);
// Call EndInvoke to wait for the asynchronous call to complete,
// and to retrieve the results.
string returnValue = caller.EndInvoke(out threadId, result);
Console.WriteLine("The call executed on thread {0}, has completed using EndInvoke (blocking) with return value \"{1}\".", threadId, returnValue);
Console.WriteLine();
#endregion
ad = new AsyncDemo();
caller = new AsyncMethodCaller(ad.TestMethod);
#region Using a Wait Handle
Console.WriteLine("Beginning wait handle method...");
result = caller.BeginInvoke(1234, out threadId, null, null);
Thread.Sleep(0);
Console.WriteLine("Main thread {0} does some more work.", Thread.CurrentThread.ManagedThreadId);
// Wait for the WaitHandle to become signalled.
result.AsyncWaitHandle.WaitOne();
// Perform additional processing here.
// Call EndInvoke to retrieve the results.
returnValue = caller.EndInvoke(out threadId, result);
// Close the wait handle.
result.AsyncWaitHandle.Close();
Console.WriteLine("The called executed on thread {0}, has completed using a Wait Handle with return value \"{1}\".", threadId, returnValue);
Console.WriteLine();
#endregion
ad = new AsyncDemo();
caller = new AsyncMethodCaller(ad.TestMethod);
#region Using Polling
Console.WriteLine("Beginning polling method...");
result = caller.BeginInvoke(1010, out threadId, null, null);
// Poll while simulating work.
while (result.IsCompleted == false)
{
Thread.Sleep(250);
Console.Write(".");
}
returnValue = caller.EndInvoke(out threadId, result);
Console.WriteLine("\nThe call executed on thread {0}, has completed using polling with return value \"{1}\".", threadId, returnValue);
Console.WriteLine();
#endregion
ad = new AsyncDemo();
caller = new AsyncMethodCaller(ad.TestMethod);
#region Using an AsyncCallBack method
Console.WriteLine("Beginning asynchronous callback method...");
/*
AsyncCallback callback = new AsyncCallback(ad.AsyncCallBackMethod);
result = caller.BeginInvoke(1234, out threadId, callback, null);
callback(result);
*/
result = caller.BeginInvoke(1234, out threadId, new AsyncCallback(ad.AsyncCallBackMethod),
"The call executed on thread {0}, with return value \"{1}\".");
Console.WriteLine("The main thread {0} continues to execute...", Thread.CurrentThread.ManagedThreadId);
// The callback is made on a threadpool thread. Threadpool threads
// are background threads, which do not keep the application running
// if the main thread ends. Comment out the next line to demonstrate
// this.
Thread.Sleep(4000);
Console.WriteLine("The main thread ends.");
Console.WriteLine();
#endregion
#region My own test
Console.WriteLine("Running my own test...");
AsyncThingy thingy = new AsyncThingy();
thingy.DoAsyncStuff();
Console.WriteLine("Main thread {0} is back.", Thread.CurrentThread.ManagedThreadId);
Console.WriteLine("The asynchronous method should write something shortly, or stuff will explode");
Thread.Sleep(6000);
#endregion
}
public AsyncThingy()
{
myAd = new AsyncDemo();
caller = new AsyncMethodCaller(myAd.TestMethod);
}