• 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)


    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:https://www.cnblogs.com/hijushen/p/4561803.html
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