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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 );