單線程的winfom程序中，設置一個控件的值是很easy的事情，直接 this.TextBox1.value = "Hello World!";就搞定了，但是如果在一個新線程中這么做，比如:PRivate void btnSet_Click(object sender, EventArgs e){ Thread t = new Thread(new ParameterizedThreadStart(SetTextBoxValue)); //當然也可以用匿名委托寫成Thread t = new Thread(SetTextBoxValue); t.Start("Hello World");}void SetTextBoxValue(object obj){ this.textBox1.Text = obj.ToString();}運行時，會報出一個無情的錯誤：線程間操作無效: 從不是創建控件“textBox1”的線程訪問它。究其原因，winform中的UI控件不是線程安全的，如果可以隨意在任何線程中改變其值，你創建一個線程，我創建一個線程，大家都來搶著更改"TextBox1"的值，沒有任何秩序的話，天下大亂...解決辦法:1.掩耳盜鈴法（Control.CheckForIllegalCrossThreadCalls = false;）--僅Winform有效using System;using System.Threading;using System.Windows.Forms;namespace ThreadTest{ public partial class Form1 : Form { public Form1() { InitializeComponent(); Control.CheckForIllegalCrossThreadCalls = false;//這一行是關鍵 } private void btnSet_Click(object sender, EventArgs e) { Thread t = new Thread(new ParameterizedThreadStart(SetTextBoxValue)); t.Start("Hello World"); } void SetTextBoxValue(object obj) { this.textBox1.Text = obj.ToString(); } }}設置Control.CheckForIllegalCrossThreadCalls為false,相當于不檢測線程之間的沖突，允許各路線程隨便亂搞，當然最終TextBox1的值到底是啥難以預料，只有天知道，不過這也是最省力的辦法2.利用委托調用--最常見的辦法（僅WinForm有效）using System;using System.Threading;using System.Windows.Forms;namespace ThreadTest{ public partial class Form1 : Form { delegate void D(object obj); public Form1() { InitializeComponent(); } private void btnSet_Click(object sender, EventArgs e) { Thread t = new Thread(new ParameterizedThreadStart(SetTextBoxValue)); t.Start("Hello World"); } void SetTextBoxValue(object obj) { if (textBox1.InvokeRequired) { D d = new D(DelegateSetValue); textBox1.Invoke(d,obj); } else { this.textBox1.Text = obj.ToString(); } } void DelegateSetValue(object obj) { this.textBox1.Text = obj.ToString(); } }}3.利用SynchronizationContext上下文 -- 最神秘的方法(Winform/Silverlight能用)之所以說它神秘，是因為msdn官方對它的解釋據說也是不清不楚using System;using System.Threading;using System.Windows.Forms;namespace ThreadTest{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void btnSet_Click(object sender, EventArgs e) { Thread t = new Thread(new ParameterizedThreadStart(Run)); MyPram _p = new MyPram() { context = SynchronizationContext.Current, parm = "Hello World" }; t.Start(_p); } void Run(object obj) { MyPram p = obj as MyPram; p.context.Post(SetTextValue, p.parm); } void SetTextValue(object obj) { this.textBox1.Text = obj.ToString(); } } public class MyPram { public SynchronizationContext context { set; get; } public object parm { set; get; } }}4.利用BackgroundWorker --最偷懶的辦法(Winform/Silverlight通用)BackgroundWorker會在主線程之外，另開一個后臺線程，我們可以把一些處理放在后臺線程中處理，完成之后，后臺線程會把結果傳遞給主線程，同時結束自己。using System;using System.ComponentModel;using System.Windows.Forms;namespace ThreadTest{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void btnSet_Click(object sender, EventArgs e) { //MessageBox.Show(Thread.CurrentThread.ManagedThreadId.ToString()); using (BackgroundWorker bw = new BackgroundWorker()) { bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted); bw.DoWork += new DoWorkEventHandler(bw_DoWork); bw.RunWorkerAsync("Hello World"); } } void bw_DoWork(object sender, DoWorkEventArgs e) { //MessageBox.Show(Thread.CurrentThread.ManagedThreadId.ToString()); e.Result = e.Argument;//這里只是簡單的把參數當做結果返回，當然您也可以在這里做復雜的處理后，再返回自己想要的結果(這里的操作是在另一個線程上完成的) } void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { //這時后臺線程已經完成，并返回了主線程，所以可以直接使用UI控件了 this.textBox1.Text = e.Result.ToString(); //MessageBox.Show(Thread.CurrentThread.ManagedThreadId.ToString()); } }}5.Dispatcher.BeginInvoke--Silverlight的獨門秘籍代碼using System.Threading;using System.Windows.Controls;using System.Windows.Input;namespace ThreadTest{ public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); } private void LayoutRoot_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { Thread t = new Thread(SetTextValue); t.Start("Hello World"); } void SetTextValue(object text) { this.Dispatcher.BeginInvoke(() => { this.txt.Text = text.ToString(); }); } }}