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重写 WndProc

   
     

    
      
    
      public
    
       
    
      class
    
       MyTextBox : TextBox
{
 
    
      public
    
       
    
      const
    
       
    
      int
    
       WM_COPY 
    
      =
    
       
    
      0x301
    
      ;
 
    
      public
    
       
    
      const
    
       
    
      int
    
       WM_CUT 
    
      =
    
       
    
      0x300
    
      ;
 
    
      protected
    
       
    
      override
    
       
    
      void
    
       WndProc(
    
      ref
    
       Message m)
 {
 
    
      if
    
       (m.Msg 
    
      ==
    
       WM_COPY 
    
      ||
    
       m.Msg 
    
      ==
    
       WM_CUT) 
    
      return
    
      ;
    
      //
    
      不处理
    
      

    
       
    
      base
    
      .WndProc(
    
      ref
    
       m);
 }
}


   
     

 

 

 

  
    

   
     
   
     Clipboard.SetDataObject(
   
     null
   
     );