ThreadPool.QueueUserWorkItem 方法 (WaitCallback)

说明：将方法排入队列以便执行，WaitCallback，表示要执行的方法。如果将方法成功排入队列，则为 true；否则为 false。

示例：addtest方法需要比较长的时间来响应，因此在button1_Click被点击以后，程序会失去响应，使用ThreadPool.QueueUserWorkItem 后，页面会继续响应其他时间，等addtest执行结束后，响应结果。

< Window  x:Class ="WpfAppThread.Window1"
    xmlns ="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x ="http://schemas.microsoft.com/winfx/2006/xaml"
    Title ="Window1"  Height ="300"  Width ="300" >
     < Grid >
         < Button  Height ="23"  HorizontalAlignment ="Left"  Margin ="9,23,0,0"  Name ="button1"  VerticalAlignment ="Top"  Width ="75"  Click ="button1_Click" > ButtonOne </ Button >
         < Button  Height ="23"  Margin ="102,23,101,0"  Name ="button2"  VerticalAlignment ="Top"  Click ="button2_Click" > ButtonTwo </ Button >
     </ Grid >
</ Window >

 

 

         private   void  button1_Click( object  sender, RoutedEventArgs e)
        {
            ThreadPool.QueueUserWorkItem( new  WaitCallback(addtest), " Testaa " ); 
             // addtest();
        }

         private   void  addtest( object  aa)
        {
             long  result = 0 ;
             for  ( int  i  =   0 ; i  <   1000000000 ; i ++ )
            {
                result  +=  i;
            }
            MessageBox.Show(result.ToString() + aa.ToString());
            
        }

         private   void  button2_Click( object  sender, RoutedEventArgs e)
        {
            MessageBox.Show( " two " );
        }