以下是調用代碼：

private const Int32 WM_SYSCOMMAND = 274;
private const UInt32 SC_CLOSE = 61536;
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
private static extern bool PostMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
private static extern bool PostMessage(IntPtr hWnd, int Msg, uint wParam, uint lParam);
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
private static extern bool PostMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern int RegisterWindowMessage(string lpString);
 
 //顯示屏幕鍵盤
public static int ShowInputPanel()
{
      try
      {
            dynamic file = "C:\\Program Files\\Common Files\\microsoft shared\\ink\\TabTip.exe";
            if (!System.IO.File.Exists(file))
                return -1;
            Process.Start(file);
            //return SetUnDock(); //不知SetUnDock()是什麽，所以直接註釋返回1
            return 1;
      }
      catch (Exception)
      {
            return 255;
      }
}

//隱藏屏幕鍵盤
public static void HideInputPanel(){
      IntPtr TouchhWnd = new IntPtr(0);
      TouchhWnd = FindWindow("IPTip_Main_Window", null);
      if (TouchhWnd == IntPtr.Zero)
            return;
      PostMessage(TouchhWnd, WM_SYSCOMMAND, SC_CLOSE, 0);
}

Windows系統還有一個OSK的虛擬鍵盤，這個是浮動的，和自動彈出的鍵盤有點區別，需要的話也可以直接調用。

Process.Start(@"C:\windows\system32\osk.exe");

C#調用Windows(8/10)自帶的虛擬鍵盤