如何向线程传递形参

先看一个使用指向方法的ThreadStart委托创建线程的示例：

using System;using System.Threading;namespace ConsoleApplicationThread{ class Program { static void Main(string[] args) { Thread t = new Thread(new ThreadStart(DoSomething)); t.Start(); Console.WriteLine("Continuing with the execution"); while (!t.IsAlive) ; Thread.Sleep(1); t.Abort(); Console.ReadLine(); } static void DoSomething() { try { while (true) { Console.WriteLine("Doing something....."); } } catch (ThreadAbortException ex) { Console.WriteLine(ex.Message); } } }} 

如果希望作为线程调用的函数具有形参，情况会如何？在这种情况下，有一下两种选择：

1> 在类中包装函数，并且通过特性传入形参

2>使用ParameterizedThreadStart委托而非ThreadStar委托

使用相同的实例，第一种选择实在类中包装DoSomething()方法，然后提供特性以接受形参值：

using System;using System.Threading;namespace ConsoleApplication1{ class Program { static void Main(string[] args) { SomeClass sc = new SomeClass(); sc.msg = "userful"; Thread t = new Thread(new ThreadStart(sc.DoSomething)); t.Start(); Console.ReadKey(); } class SomeClass { public string msg { get; set; } public void DoSomething() { try { while (true) { Console.WriteLine("Doing Something....{0}", msg); } } catch (ThreadAbortException ex) { Console.WriteLine(ex.Message); } } } }}

第二种选择是使用ParameterizedThreadStart委托而非ThreadStart委托，ParameterizedThread委托采用object类型的形参，因此如果作为线程调用的函数具有形参，该形参的类型就必须是object.如下代码所示：

using System;using System.Threading;namespace ConsoleApplication1{ class Program { static void Main(string[] args) { Thread t = new Thread(new ParameterizedThreadStart(DoSomething)); t.Start("userful"); Console.WriteLine("Continuing with the execution..."); } static void DoSomething(object msg) { try { while (true) { Console.WriteLine("Doing Something...{0}", msg); } } catch (ThreadAbortException ex) { Console.WriteLine(ex.Message); } } }}