C# 禁止ALT+F4

1. Windows Forms中禁用窗体的关闭按钮

添加必要的命名空间及常数和API函数的引用

   
     

    
      
    
      using
    
       System.Runtime.InteropServices;


    
      private
    
       
    
      const
    
       
    
      int
    
       SC_CLOSE 
    
      =
    
       
    
      0xF060
    
      ;


    
      private
    
       
    
      const
    
       
    
      int
    
       MF_ENABLED 
    
      =
    
       
    
      0x00000000
    
      ;


    
      private
    
       
    
      const
    
       
    
      int
    
       MF_GRAYED 
    
      =
    
       
    
      0x00000001
    
      ;


    
      private
    
       
    
      const
    
       
    
      int
    
       MF_DISABLED 
    
      =
    
       
    
      0x00000002
    
      ;

 

[DllImport(
    
      "
    
      user32.dll
    
      "
    
      , EntryPoint 
    
      =
    
       
    
      "
    
      GetSystemMenu
    
      "
    
      )]


    
      private
    
       
    
      static
    
       
    
      extern
    
       IntPtr GetSystemMenu(IntPtr hWnd, 
    
      int
    
       bRevert);

[DllImport(
    
      "
    
      User32.dll
    
      "
    
      )]


    
      public
    
       
    
      static
    
       
    
      extern
    
       
    
      bool
    
       EnableMenuItem(IntPtr hMenu, 
    
      int
    
       uIDEnableItem, 
    
      int
    
       uEnable);


   
     

 

在窗体的Load事件处理函数内添加代码

  
    

   
     
   
     private
   
      
   
     void
   
      Form6_Load(
   
     object
   
      sender, EventArgs e)

{
 IntPtr hMenu 
   
     =
   
      GetSystemMenu(
   
     this
   
     .Handle, 
   
     0
   
     );
 EnableMenuItem(hMenu, SC_CLOSE, MF_DISABLED 
   
     |
   
      MF_GRAYED);

}
  
    

 

2. Windows Forms中禁用窗体的关闭按钮和ALT+F4关闭

代码

   
     

    
      
    
      protected
    
       
    
      override
    
       CreateParams CreateParams

{
 
    
      get
    
      
 {
 
    
      const
    
       
    
      int
    
       CS_NOCLOSE 
    
      =
    
       
    
      0x200
    
      ;
 CreateParams cp 
    
      =
    
       
    
      base
    
      .CreateParams;
 cp.ClassStyle 
    
      =
    
       cp.ClassStyle 
    
      |
    
       CS_NOCLOSE;
 
    
      return
    
       cp;
 }

}