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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);