Silverlight中 非UI线程更新UI 的几种方法:Delegate, AsyncOperation,BackgroundWorker 
首先列一下基础代码: 

<UserControl 

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 

    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 

    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 

    mc:Ignorable="d" 

    x:Class="Shareach.TestUI.UCThreadUpdate" 

    d:DesignWidth="250" d:DesignHeight="120"> 

<StackPanel> 

<TextBlock x:Name="txtCalc" /> 

</StackPanel> 

</UserControl>

using System; 

using System.Windows; 

using System.Windows.Controls; 

using System.Windows.Documents; 

using System.Windows.Ink; 

using System.Windows.Input; 

using System.Windows.Media; 

using System.Windows.Media.Animation; 

using System.Windows.Shapes; 

using System.Threading; 

namespace Shareach.TestUI 

{ 

    public partial class UCThreadUpdate: UserControl 

    { 

       public UCMsgSend() 

       { 

              InitializeComponent(); 

              ThreadUpdate(); 

       } 

       void ThreadUpdate() 

       { 

             Thread thread = new Thread(

new ThreadStart(DoWork)); 

              thread.Start(); 

       } 

       void DoWork() 

       { 

              int i=0; 

              while(i<100){ 

                     DoShow(i);  

              } 

       } 

    } 

}

DoShow的三种写法 
1. delegate

void DoShow(i){ 

    this.Dispatcher.BeginInvoke( 

                            delegate { 

                                   txtCalc.Text = string.format(“result “{0}”,i); 

                            }); 

}

2.AsyncOperation

void DoShow(i){ 

    //这个可以写成成员变量,我这里只是为了好区分 

    System.ComponentModel.AsyncOperation asyncOper = System.ComponentModel.AsyncOperationManager.CreateOperation(null); 

    asyncOper.Post(result => 

            { 

                txtCalc.Text = string.format(“result “{0}”,i); 

            }, null); 

}

3.BackgroundWorker

参考 的

Winform 也一样,