using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;namespace 异步调用实现方法汇总
{/// <summary>/// 异步调用方法总结：/// 1.BeginEnvoke EndEnvoke/// 当使用BeginInvoke异步调用方法时，如果方法未执行完，EndInvoke方法就会一直阻塞，直到被调用的方法执行完毕/// </summary>class Program{public delegate void PrintDelegate(string s);static void Main(string[] args){PrintDelegate printDelegate = Print;Console.WriteLine("主线程");IAsyncResult result= printDelegate.BeginInvoke("Hello World.", null, null);Console.WriteLine("主线程继续执行...");//当使用BeginInvoke异步调用方法时，如果方法未执行完，EndInvoke方法就会一直阻塞，直到被调用的方法执行完毕
            printDelegate.EndInvoke(result);Console.WriteLine("Press any key to continue...");Console.ReadKey(true);}public static void Print(string s){Console.WriteLine("异步线程开始执行："+s);Thread.Sleep(5000);}}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;namespace 异步调用实现方法汇总2
{/// <summary>/// 异步调用方法总结：/// 2.WaitOne/// 可以看到，与EndInvoke类似，只是用WaitOne函数代码了EndInvoke而已。/// </summary>class Program{public delegate void PrintDelegate(string s);static void Main(string[] args){PrintDelegate printDelegate = Print;Console.WriteLine("主线程");IAsyncResult result = printDelegate.BeginInvoke("Hello World.", null, null);Console.WriteLine("主线程继续执行...");result.AsyncWaitHandle.WaitOne(-1, false);Console.WriteLine("Press any key to continue...");Console.ReadKey(true);}public static void Print(string s){Console.WriteLine("异步线程开始执行：" + s);Thread.Sleep(5000);}}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;namespace 异步调用实现方法汇总3
{/// <summary>/// 异步调用方法总结：/// 3.轮询/// 之前提到的两种方法，只能等下异步方法执行完毕，/// 在完毕之前没有任何提示信息，整个程序就像没有响应一样，用户体验不好，/// 可以通过检查IasyncResult类型的IsCompleted属性来检查异步调用是否完成，/// 如果没有完成，则可以适时地显示一些提示信息/// </summary>class Program{public delegate void PrintDelegate(string s);static void Main(string[] args){PrintDelegate printDelegate = Print;Console.WriteLine("主线程:"+Thread.CurrentThread.ManagedThreadId );IAsyncResult result = printDelegate.BeginInvoke("Hello world.", null, null);Console.WriteLine("主线程:" + Thread.CurrentThread.ManagedThreadId + ",继续执行...");while (!result.IsCompleted){Console.WriteLine(".");Thread.Sleep(500);}Console.WriteLine("主线程:" + Thread.CurrentThread.ManagedThreadId + "  Press any key to continue...");Console.ReadKey(true);}public static void Print(string s){Console.WriteLine("当前线程：" + Thread.CurrentThread.ManagedThreadId + s);Thread.Sleep(5000);}}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;namespace 异步调用实现方法汇总4
{/// <summary>/// 异步调用方法总结：/// 4.回调/// 之前三种方法者在等待异步方法执行完毕后才能拿到执行的结果，期间主线程均处于等待状态。/// 回调和它们最大的区别是，在调用BeginInvoke时只要提供了回调方法，那么主线程就不必要再等待异步线程工作完毕，/// 异步线程在工作结束后会主动调用我们提供的回调方法，并在回调方法中做相应的处理，例如显示异步调用的结果。/// </summary>class Program{public delegate void PrintDelegate(string s);static void Main(string[] args){PrintDelegate printDelegate = Print;Console.WriteLine("主线程.");printDelegate.BeginInvoke("Hello world.", PrintComeplete, printDelegate);Console.WriteLine("主线程继续执行...");Console.WriteLine("Press any key to continue...");Console.ReadKey(true);}public static void Print(string s){ Console.WriteLine("当前线程："+s);Thread.Sleep(5000);}//回调方法要求//1.返回类型为void//2.只有一个参数IAsyncResultpublic static void PrintComeplete(IAsyncResult result){(result.AsyncState as PrintDelegate).EndInvoke(result);Console.WriteLine("当前线程结束." + result.AsyncState.ToString());}}
}

using System.Diagnostics;
using System.Threading;
using System.Windows;namespace TestDelegateWrapper
{/// <summary>/// Interaction logic for MainWindow.xaml/// </summary>public partial class MainWindow : Window{public MainWindow(){InitializeComponent();}private void ButtonBase_OnClick(object sender, RoutedEventArgs e){WrapperSyncMethodAsync("ABC");Trace.WriteLine("Main thread continue...");}private delegate string SyncMethod1Delegate(string str);private void WrapperSyncMethodAsync(string str){SyncMethod1Delegate syncMethod1Delegate = SyncMethod1;syncMethod1Delegate.BeginInvoke(str, x =>{var result= syncMethod1Delegate.EndInvoke(x);// using the result to do something
                Trace.WriteLine(result);}, null);}private string SyncMethod1(string str){Thread.Sleep(2000);return str;}}
}