.NET3.5下用Lambda简化跨线程访问窗体控件,避免繁复的delegate,Invoke(转)

1、错误的代码是：

   using
    System;

   using
    System.Collections.Generic;

   using
    System.ComponentModel;

   using
    System.Data;

   using
    System.Drawing;

   using
    System.Linq;

   using
    System.Text;

   using
    System.Windows.Forms;


   namespace
    WindowsFormsApplication5
{
    
   public
    
   partial
    
   class
    Form1 : Form
    {
        
   public
    Form1()
        {
            InitializeComponent();
        }

        
   private
    
   string
    blog 
   =
    
   "
   http://www.chenjiliang.com/
   "
   ;


        
   private
    
   void
    Form1_Load(
   object
    sender, EventArgs e)
        {
            
   new
    System.Threading.Thread(ShowTime).Start();
        }

        
   private
    
   void
    ShowTime()
        {
            textBox1.Text 
   =
    DateTime.Now.ToString();
        }
    }
}
  

会看到Cross-thread operation not valid: Control 'textBox1' accessed from a thread other than the thread it was created on.的错误

2、增加一个Public static 类

   using
    System;

   using
    System.Collections.Generic;

   using
    System.Linq;

   using
    System.Text;

   using
    System.Windows.Forms;



   namespace
    WindowsFormsApplication5
{
    
   public
    
   static
    
   class
    ControlExtention
    {
        
   public
    
   delegate
    
   void
    InvokeHandler();

        
   public
    
   static
    
   void
    SafeInvoke(
   this
    Control control, InvokeHandler handler)
        {
            
   if
    (control.InvokeRequired)
            {
                control.Invoke(handler);
            }
            
   else
   
            {
                handler();
            }
        }
    }
}
  

3、build

4、这样写就好啦

 

   using
    System;

   using
    System.Collections.Generic;

   using
    System.ComponentModel;

   using
    System.Data;

   using
    System.Drawing;

   using
    System.Linq;

   using
    System.Text;

   using
    System.Windows.Forms;


   namespace
    WindowsFormsApplication5
{
    
   public
    
   partial
    
   class
    Form1 : Form
    {
        
   public
    Form1()
        {
            InitializeComponent();
        }
        
   private
    
   string
    s 
   =
    
   "
   http://www.chenjiliang.com/
   "
   ;

        
   private
    
   void
    Form1_Load(
   object
    sender, EventArgs e)
        {
            
   new
    System.Threading.Thread(ShowTime).Start();
        }

        
   private
    
   void
    ShowTime()
        {
            
   this
   .SafeInvoke(() 
   =>
   
            {
                textBox1.Text 
   =
    DateTime.Now.ToString();
            });
        }
    }
}