TPL——开始一个Task

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创建Tasks的四个方式：

using System;using System.Threading.Tasks;namespace Listing_02 {class Listing_02 {static void Main(string[] args) {// use an Action delegate and a named methodTask task1 = new Task(new Action(printMessage));// use a anonymous delegateTask task2 = new Task(delegate {printMessage();});// use a lambda expression and a named methodTask task3 = new Task(() => printMessage());// use a lambda expression and an anonymous methodTask task4 = new Task(() => {printMessage();});task1.Start();task2.Start();task3.Start();task4.Start();// wait for input before exitingConsole.WriteLine("Main method complete. Press enter to finish.");Console.ReadLine();}static void printMessage() {Console.WriteLine("Hello World");}}}

创建并且运行Tasks

Task.Factory.StartNew(() => {Console.WriteLine("Hello World");});

传递参数

using System;using System.Threading.Tasks;namespace Listing_03 {class Listing_03 {static void Main(string[] args) {// use an Action delegate and a named methodTask task1 = new Task(new Action<object>(printMessage),"First task");// use a anonymous delegateTask task2 = new Task(delegate (object obj) {printMessage(obj);}, "Second Task");// use a lambda expression and a named method// note that parameters to a lambda don’t need// to be quoted if there is only one parameterTask task3 = new Task((obj) => printMessage(obj), "Third task");// use a lambda expression and an anonymous methodTask task4 = new Task((obj) => {printMessage(obj);}, "Fourth task");task1.Start();task2.Start();task3.Start();task4.Start();// wait for input before exitingConsole.WriteLine("Main method complete. Press enter to finish.");Console.ReadLine();}static void printMessage(object message) {Console.WriteLine("Message: {0}", message);}}}

返回结果

using System;using System.Threading.Tasks;namespace Listing_05 {class Listing_05 {static void Main(string[] args) {// create the taskTask<int> task1 = new Task<int>(() => {int sum = 0;for (int i = 0; i < 100; i++) {sum += i;}return sum;});// start the tasktask1.Start();// write out the resultConsole.WriteLine("Result 1: {0}", task1.Result);// create the task using stateTask<int> task2 = new Task<int>(obj => {int sum = 0;int max = (int)obj;for (int i = 0; i < max; i++) {sum += i;}return sum;}, 100);// start the tasktask2.Start();// write out the resultConsole.WriteLine("Result 2: {0}", task2.Result);// wait for input before exitingConsole.WriteLine("Main method complete. Press enter to finish.");Console.ReadLine();}}}

在取得结果处，线程会阻塞直至结果返回。

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