c# 多线程的几种方式 【转载】

1.什么是线程？

进程作为操作系统执行程序的基本单位，拥有应用程序的资源，进程包含线程，进程的资源被线程共享，线程不拥有资源。

 

2.前台线程和后台线程的区别？

程序关闭时，后台线程直接关闭，但前台线程会执行完后关闭。

通过Thread类新建线程默认为前台线程。其他方式创建的都是后台线程。

 

多线程的几种方式

一. 异步多线程

        static void Main(string[] args){Console.WriteLine("----------主程序开始，线程ID是{0}-----------------", Thread.CurrentThread.ManagedThreadId);for(int i = 0; i< 5;i++){Action<string> action = t =>{for(int k = 0; k< 1000000000;k++){ }Console.WriteLine("当前参数是{0},当前线程是{1}",t,Thread.CurrentThread.ManagedThreadId);};action.BeginInvoke("参数是" + i, null, null);}Console.WriteLine("----------主程序结束，线程ID是{0}-----------------", Thread.CurrentThread.ManagedThreadId);Console.Read();}}

二. Threads线程

        static void Main(string[] args){Console.WriteLine("----------主程序开始，线程ID是{0}-----------------", Thread.CurrentThread.ManagedThreadId);for(int i = 0; i< 5;i++){ParameterizedThreadStart threadStart = t =>{for (int k = 0; k < 1000000000; k++){ }Console.WriteLine("当前参数是{0},当前线程是{1}", t, Thread.CurrentThread.ManagedThreadId);};Thread thread = new Thread(threadStart);thread.Start(i);}Console.WriteLine("----------主程序结束，线程ID是{0}-----------------", Thread.CurrentThread.ManagedThreadId);Console.Read();}

三. ThreadPool线程池

        static void Main(string[] args){Console.WriteLine("----------主程序开始，线程ID是{0}-----------------", Thread.CurrentThread.ManagedThreadId);for(int i = 0; i< 5;i++){WaitCallback waitCallback = t =>{for (int k = 0; k < 1000000000; k++){ }Console.WriteLine("当前参数是{0},当前线程是{1}", t, Thread.CurrentThread.ManagedThreadId);};ThreadPool.QueueUserWorkItem(waitCallback, i);}Console.WriteLine("----------主程序结束，线程ID是{0}-----------------", Thread.CurrentThread.ManagedThreadId);Console.Read();}

四. Task

        static void Main(string[] args){Console.WriteLine("----------主程序开始，线程ID是{0}-----------------", Thread.CurrentThread.ManagedThreadId);TaskFactory taskFactory = new TaskFactory();for (int i = 0; i< 5;i++){Action<object> action = t =>{for (int k = 0; k < 1000000000; k++){ }Console.WriteLine("当前参数是{0},当前线程是{1}", t, Thread.CurrentThread.ManagedThreadId);};taskFactory.StartNew(action,i);}Console.WriteLine("----------主程序结束，线程ID是{0}-----------------", Thread.CurrentThread.ManagedThreadId);Console.Read();}

五. Parallel

        static void Main(string[] args){Console.WriteLine("----------主程序开始，线程ID是{0}-----------------", Thread.CurrentThread.ManagedThreadId);Action action1 = () =>{for (int k = 0; k < 1000000000; k++){ }Console.WriteLine("当前参数是1,当前线程是{0}", Thread.CurrentThread.ManagedThreadId);};Action action2 = () =>{for (int k = 0; k < 1000000000; k++){ }Console.WriteLine("当前参数是2,当前线程是{0}", Thread.CurrentThread.ManagedThreadId);};Action action3 = () =>{for (int k = 0; k < 1000000000; k++){ }Console.WriteLine("当前参数是3,当前线程是{0}", Thread.CurrentThread.ManagedThreadId);};Parallel.Invoke(action1, action2, action3);Console.WriteLine("----------主程序结束，线程ID是{0}-----------------", Thread.CurrentThread.ManagedThreadId);Console.Read();}

上面简单介绍了5种多线程的使用方式,后续文章会记录每种多线程的详细使用方法.

转载：

https://www.cnblogs.com/yangxi1081/p/9639958.html