C # + winform: Right-click the custom copy and paste shortcut menu. Multiple widgets share one shortcut menu.

ProgramText Box or RichTextBox needs to be used for text input or display, for general users, may even press the shortcut key Ctrl + C copy, CTRL + V paste will not be used, as a developer, you must right-click a menu to display "copy" and "Paste ".

You can assign a context menu (contextmenustrip, also called right-click menu and shortcut menu) to several controls by setting the contextmenustrip attribute of these controls to the menu to be displayed.

In menu events, how do I determine which control is clicked? The answer is the sourcecontrol attribute of the context menu, Which is copied and pasted below.Code:

         Private   Void Copy toolstripmenuitem_click ( Object Sender, eventargs E)
{
 String Selecttext = (RichTextBox) menusend. sourcecontrol). selectedtext;
 If (Selecttext! = "" )
{
Clipboard. settext (selecttext );
}
}

 Private   Void Paste toolstripmenuitem_click ( Object Sender, eventargs E)
{
 If (Clipboard. containstext ())
{
RichTextBox txtbox = (RichTextBox) menusend. sourcecontrol;
 Int Index = txtbox. selectionstart; // Record the cursor position before pasting  
                  String TEXT = txtbox. text;
 //  Delete selected text  
 TEXT = text. Remove (txtbox. selectionstart, txtbox. selectionlength );
 //  Insert clipboard content at the current cursor Input Point  
 TEXT = text. insert (txtbox. selectionstart, clipboard. gettext ());
Txtbox. Text = text;
 //  Reset the cursor position 
 Txtbox. selectionstart = index;
}
}

To make the right-click menu more intelligent, "copy" takes effect when no text is selected; when the clipboard has no content, "Paste" is invalid. The following code is added to its opened event.

  Private   Void Menusend_opened ( Object Sender, eventargs E)
{
 //  If no text is selected, the copy menu is disabled.  
              String Selecttext = (RichTextBox) menusend. sourcecontrol). selectedtext;
 If (Selecttext! = "" )
Copy toolstripmenuitem. Enabled = True ;
 Else 
Copy toolstripmenuitem. Enabled = False ;
 //  When the clipboard has no text content, the paste menu is disabled.  
              If (Clipboard. containstext ())
{
Paste toolstripmenuitem. Enabled = True ;
}
 Else 
Paste toolstripmenuitem. Enabled = False ;

}