调用外部程序主窗体做子窗体

 [DllImport("User32.dll ", EntryPoint = "SetParent")]
        private static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
        [DllImport("user32.dll ", EntryPoint = "ShowWindow")]
        public static extern int ShowWindow(IntPtr hwnd, int nCmdShow);

引用API

 Process p = new Process();           

  p.StartInfo.FileName = "cmd.exe "; 

p.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Minimized;//加上这句效果更好

            p.Start();           

  System.Threading.Thread.Sleep(100);//加上，100如果效果没有就继续加大

           

SetParent(p.MainWindowHandle, this.Handle);      

      

ShowWindow(p.MainWindowHandle, 3);