C# enable为false时不变颜色

         [System.Runtime.InteropServices.DllImport("user32.dll ")]
         public static extern int SetWindowLong(IntPtr hWnd, int nIndex, int wndproc);
         [System.Runtime.InteropServices.DllImport("user32.dll ")]
         public static extern int GetWindowLong(IntPtr hWnd, int nIndex);
  
         public const int GWL_STYLE = -;
         public const int WS_DISABLED = 0x8000000;
  
         public static void SetControlEnabled(Control c, bool enabled)
         {
             if (enabled)
             { SetWindowLong(c.Handle, GWL_STYLE, (~WS_DISABLED) & GetWindowLong(c.Handle, GWL_STYLE)); }
             else
             { SetWindowLong(c.Handle, GWL_STYLE, WS_DISABLED + GetWindowLong(c.Handle, GWL_STYLE)); }
         }
  
         private void button2_Click(object sender, System.EventArgs e)
         {
             SetControlEnabled(this.button1, false);
             this.button1.ForeColor = Color.White;
         }
这个操作不是直接改变Enable 而是去掉它的鼠标绑定