program.cs

来自「C#高级编程第6版随书源代码 值得下载」· CS 代码 · 共 86 行

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using System.Diagnostics;

namespace Wrox.ProCSharp.Threading
{
   class Program
   {
      static int TakesAWhile(int data, int ms)
      {
         Console.WriteLine("TakesAWhile started");
         Thread.Sleep(ms);
         Console.WriteLine("TakesAWhile completed");
         return ++data;
      }

      public delegate int TakesAWhileDelegate(int data, int ms);

      static void Main()
      {
         // synchronous
         // TakesAWhile(1, 3000);
         TakesAWhileDelegate d1 = TakesAWhile;

         // polling
         //IAsyncResult ar = d1.BeginInvoke(1, 3000, null, null);
         //while (!ar.IsCompleted)
         //{ 
         //   // doing something else
         //   Console.Write("."); 
         //   Thread.Sleep(50);
         //}
         //int result = d1.EndInvoke(ar);
         //Console.WriteLine("result: {0}", result);

         // wait handle
         //IAsyncResult ar = d1.BeginInvoke(1, 3000, null, null);
         //while (true)
         //{
         //   Console.Write(".");
         //   if (ar.AsyncWaitHandle.WaitOne(50, false))
         //   {
         //      Console.WriteLine("Can get the result now");
         //      break;
         //   }
         //}
         //int result = d1.EndInvoke(ar);
         //Console.WriteLine("result: {0}", result);

         // async callback
         //d1.BeginInvoke(1, 3000, TakesAWhileCompleted, d1);
         //for (int i = 0; i < 100; i++)
         //{
         //   Console.Write(".");
         //   Thread.Sleep(50);
         //}

         d1.BeginInvoke(1, 3000,
            ar =>
               {
                  int result = d1.EndInvoke(ar);
                  Console.WriteLine("result: {0}", result);
               },
            null);
         for (int i = 0; i < 100; i++)
         {
            Console.Write(".");
            Thread.Sleep(50);
         }
         
      }

      static void TakesAWhileCompleted(IAsyncResult ar)
      {
         if (ar == null) throw new ArgumentNullException("ar");
         TakesAWhileDelegate d1 = ar.AsyncState as TakesAWhileDelegate;
         Trace.Assert(d1 != null, "Invalid object type");

         int result = d1.EndInvoke(ar);
         Console.WriteLine("result: {0}", result);
      }
   }
}