通过按钮调用帮助(模拟窗体上的‘？’功能)

如题，代码如下：

 

private const int WM_SYSCOMMAND = 0x112; private const int SC_CONTEXTHELP = 0xf180; [System.Runtime.InteropServices.DllImport("user32.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto, SetLastError = false)] private static extern IntPtr SendMessage(IntPtr hWnd, Int32 Msg, IntPtr wParam, IntPtr lParam); /// <summary> /// 帮助 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void btnHelp_Click(object sender, EventArgs e) { this.btnHelp.Capture = false; SendMessage(this.Handle, WM_SYSCOMMAND, (IntPtr)SC_CONTEXTHELP, IntPtr.Zero); }