C# Delegate 异步调用

namespace ConsoleApplication22
{
    /// /// 异步操作 /// ///  ///  ///
    //internal Func<int,int,int> int MainRun(int data, int sleep);

    internal class Program
    {
        private static void Main(string[] args)
        {
            Func<int,int,int> mainRun = TakeAWhile;
            var ar = mainRun.BeginInvoke(, , null, null);
            while (!ar.IsCompleted)
            {
                Console.WriteLine(".");
                Thread.Sleep();
            }
            int result = mainRun.EndInvoke(ar);
            Console.WriteLine("Result :{0}", result);
            Console.ReadLine();
        }

        private static int TakeAWhile(int data, int sleep)
        {
            Console.WriteLine("TakesAWhile stated");
            Thread.Sleep(sleep);
            Console.WriteLine("TakesAWhile completed");
            return ++data;
        }
    }
}

namespace AsyncDelegateDemo
{
  delegate String AsyncFooDelegate(int i,int sleep);
  class Program
  {
    /// <summary>
    /// 输出当前线程的信息
    /// </summary>
   /// <param name="name">方法名称</param>

    static void PrintCurrThreadInfo(string name)
    {
      Console.WriteLine(name+ " is: " + Thread.CurrentThread.ManagedThreadId+ ", current "
      + (Thread.CurrentThread.IsThreadPoolThread ? "YES" : "NO "));
    }

      /// <summary>
      /// 测试方法，Sleep一定时间
      /// </summary>
      /// <param name="i">Sleep的时间</param>
      /// <param name="sleep"></param>
      static string Foo(int i,int sleep)
    {
       PrintCurrThreadInfo("Foo()");
       Thread.Sleep(i);
        return i.ToString();
    }

    /// <summary>
    /// 投递一个异步调用
    /// </summary>
    static void PostAsync(int i)
    {
      AsyncFooDelegate caller = Foo;
      caller.BeginInvoke(i,1000, FooCallBack, caller);
    }

    static void Main2(string[] args)
    {
      PrintCurrThreadInfo("Main()");
      for(int i = 0; i < 10 ; i++)
      {
         PostAsync(i);
      }
      Console.ReadLine();
    }

    static void FooCallBack(IAsyncResult ar)
    {
      AsyncFooDelegate caller = (AsyncFooDelegate) ar.AsyncState;
      var index = caller.EndInvoke(ar);
      PrintCurrThreadInfo("FooCallBack()="+index);
    }
  }
}