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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);