static void Main(string[] args)
{
try
{
// Display a message to show we're in Main().
Console.WriteLine("Starting the program.");
// Get the number of milliseconds from the arguments
// passed in from the command line.
int milliseconds = GetMilliseconds(args[0]);
// Create the ComplicatedCalculator object.
ComplicatedCalculator cc =
new ComplicatedCalculator(milliseconds);
// Create the delegate object.
DoSomething method = new DoSomething(cc.CalculateValue);
// Call the delegate asynchronously.
IAsyncResult asynchStatus =
method.BeginInvoke(10.4, 7.451, null, null);
// Call WaitOne() to wait until the async task is done.
Console.WriteLine("\nWaiting for task to complete.");
// Include a timeout and check to see if it completed in time.
bool inTimeBool = asynchStatus.AsyncWaitHandle.WaitOne(10000);
if (inTimeBool)
{
Console.WriteLine("\nTask has completed.");
// Get the result of the asynchronous call.
double results = method.EndInvoke(asynchStatus);
// Display the results.
Console.WriteLine("\nThe result is: {0}", results);
}
else
{
Console.WriteLine("\nTask did NOT complete in time. There are no results. May need to stop application running using Task Manager.");
}
}
catch (Exception e)
{
Console.WriteLine("\nEXCEPTION: {0}.", e.Message);
}
// Pause so we can look at the console window.
Console.Write("\n\nPress <ENTER> to end: ");
Console.ReadLine();
}
static void Main(string[] args)
{
//1.实例化一个委托，调用者发送一个请求，请求执行该方法体（还未执行）
DoSomething doSomething = new DoSomething(
() =>
{
Console.WriteLine("如果委托使用 beginInvoke 的话，这里便是异步方法体");
//4，实现完这个方法体后自动触发下面的回调函数方法体
}
);
//3 。调用者（主线程）去触发异步调用，采用异步的方式请求上面的方法体
IAsyncResult result = doSomething.BeginInvoke(
//2.自定义上面方法体执行后的回调函数
new AsyncCallback
(
//5.以下是回调函数方法体
//asyncResult.AsyncState其实就是AsyncCallback委托中的第二个参数
asyncResult =>
{
doSomething.EndInvoke(asyncResult);
Console.WriteLine(asyncResult.AsyncState.ToString());
}
),
"AsyncResult.AsyncState"
);
//DoSomething......调用者（主线程）会去做自己的事情
Console.ReadKey();
}
static void Main(string[] args)
{
try
{
// Display a message to show we're in Main().
Console.WriteLine("Starting the program.");
// Get the number of milliseconds from the arguments
// passed in from the command line.
int milliseconds = GetMilliseconds(args[0]);
// Create the ComplicatedCalculator object.
ComplicatedCalculator cc =
new ComplicatedCalculator(milliseconds);
// Create the delegate object.
DoSomething method = new DoSomething(cc.CalculateValue);
// Call the delegate asynchronously.
IAsyncResult asynchStatus =
method.BeginInvoke(10.4, 7.451, null, null);
// Poll to see if the asynchronous call is done.
while (!asynchStatus.IsCompleted)
{
System.Threading.Thread.Sleep(750);
Console.WriteLine
("\nSeeing if the asynch call is done.");
}
// Get the result of the asynchronous call.
double results = method.EndInvoke(asynchStatus);
// Display the results.
Console.WriteLine("\nThe result is: {0}", results);
}
catch (Exception e)
{
Console.WriteLine("\nEXCEPTION: {0}.", e.Message);
}
// Pause so we can look at the console window.
Console.Write("\n\nPress <ENTER> to end: ");
Console.ReadLine();
}
