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学习书籍: <C#本质论>
1--C#5.0之后推荐使用TPL(Task Parallel Libray 任务并行库) 和PLINQ(Parallel LINQ, 并行Linq).
其次是TAP(Task-based Asynchronous Pattern, 基于任务的异步模式).
--用AggregateException处理Task上的未处理异常.
--取消任务. CancellationToken
--async修饰方法, 返回Task. task.wait(100)可以阻塞现场. async方法内await 启线程执行.
==> 第一部分, 5.0推荐的线程使用方式.
2--学习了Task 等线程同步使用方式:
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading; using System.Threading.Tasks; namespace Task1 { class Program { const int _Total = 99999; static long _Count = 0; readonly static object _Sync = new Object(); static void Main(string[] args) { //Task task = Task.Run(()=>Decrement()); //for (int i = 0; i < _Total; i++) //{ // _Count++; //} //task.Wait(); //Console.WriteLine("Count = {0}", _Count); //CountAsync(); //int x = 0; //Parallel.For(0, 999999, i => // { // x++; // x--; // }); //Console.WriteLine("Count = {0}",x); Task task = Task.Run(() => Decrement()); for (int i = 0; i < _Total; i++) { bool lockTaken = false; try { Monitor.Enter(_Sync, ref lockTaken); _Count++; } finally { if (lockTaken) { Monitor.Enter(_Sync); } } } task.Wait(); Console.WriteLine("Count = {0}", _Count); Console.ReadKey(); } public static async void CountAsync() { Task task = Task.Run(() => Decrement()); for (int i = 0; i < _Total; i++) { _Count++; } await task; Console.WriteLine("Count = {0}", _Count); } static void Decrement() { for (int i = 0; i < _Total; i++) { bool lockTaken = false; try { Monitor.Enter(_Sync, ref lockTaken); _Count--; } finally { if (lockTaken) { Monitor.Exit(_Sync); } } } } } }
==> 第二部分.TPL和C#5.0之前的多线程模式
1. 调用APM #region String url = "www.baidu.com"; if (args.Length > 0) { url = args[0]; } Console.WriteLine(url); WebRequest webRequest = WebRequest.Create(url); IAsyncResult asyncResult = webRequest.BeginGetResponse(null, null); while(!asyncResult.AsyncWaitHandle.WaitOne(100)) { Console.Write("."); } WebResponse response = webRequest.EndGetResponse(asyncResult); using (StreamReader reader = new StreamReader(response.GetResponseStream())) { int length = reader.ReadToEnd().Length; Console.WriteLine(length); }2-- 复杂带状态的操作
1--CPS 连续调用样式. 的fire-and-forget模式. 减少了直接再beginXXX方法后调用EndXXX方法.
通过CPS,"登记"异步方法结束时执行的代码.
3-- 在APM方法间传递状态
1--可以通过Lambda完成委托BeginXXX调用.
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原文地址：http://www.cnblogs.com/hijushen/p/4561803.html
