c#异步，（无回调函数）

using System;

namespace ConsoleApplication1
{
class Class1
{
//声明委托
public delegate void AsyncEventHandler();

//异步方法
void Event1()
{
Console.WriteLine("Event1 Start--------------------------------------------------------------------");
System.Threading.Thread.Sleep(4000);
Console.WriteLine("Event1 End----------------------------------------------------------------------------");
}

// 同步方法
void Event2()
{
Console.WriteLine("Event2 Start");
int i = 1;
while (i < 1000)
{
i = i + 1;
Console.WriteLine("Event2 " + i.ToString());
}
Console.WriteLine("Event2 End");
}

[STAThread]
static void Main(string[] args)
{
long start = 0;
long end = 0;
Class1 c = new Class1();
Console.WriteLine("ready");
start = DateTime.Now.Ticks;

//实例委托
AsyncEventHandler asy = new AsyncEventHandler(c.Event1);
//异步调用开始，没有回调函数和AsyncState,都为null
IAsyncResult ia = asy.BeginInvoke(null, null);
//同步开始，
c.Event2();
//异步结束，若没有结束，一直阻塞到调用完成，在此返回该函数的return，若有返回值。

asy.EndInvoke(ia);

//都同步的情况。
//c.Event1();
//c.Event2();

end = DateTime.Now.Ticks;
Console.WriteLine("时间刻度差=" + Convert.ToString(end - start));
Console.ReadLine();
}
}
}