//獲取當前視窗控制代碼
IntPtr handle = new WindowInteropHelper(this).Handle;

//獲取當前工作區
SystemParameters.WorkArea

class Win32Api
    {
        #region msg

        public const int USER = 0x0400;

        public const int UM_1 = USER + 1;

        public const int WM_COPYDATA = 0x004A;

        public const int WM_SYSCOMMAND = 0x0112; 
        
        public const int SC_MOVE = 0xF010; 
        
        public const int HTCAPTION = 0x0002;
        #endregion

        #region api

        /// <summary>
        /// 程序通訊，Post Message，不接收窗體的返回值
        /// </summary>
        /// <param name="hWnd">要通訊的視窗控制代碼</param>
        /// <param name="msg"></param>
        /// <param name="wParam"></param>
        /// <param name="lParam"></param>
        [DllImport("user32.dll", EntryPoint = "PostMessage")]
        public static extern void PostMessage(IntPtr hWnd, int msg, int wParam, IntPtr lParam);

        /// <summary>
        /// 程序通訊，Send Message，接收窗體的返回值
        /// </summary>
        /// <param name="hWnd"></param>
        /// <param name="msg"></param>
        /// <param name="wParam"></param>
        /// <param name="lParam"></param>
        [DllImport("user32.dll", EntryPoint = "SendMessage")]
        public static extern void SendMessage(IntPtr hWnd, int msg, int wParam, ref  CopyDataStruc lParam);

        /// <summary>
        /// 根據窗體title找到視窗控制代碼
        /// </summary>
        /// <param name="lpClassName"></param>
        /// <param name="lpWindowName"></param>
        /// <returns></returns>
        [DllImport("User32.dll", EntryPoint = "FindWindow")]
        public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        /// <summary>
        /// 獲取當前滑鼠座標
        /// </summary>
        /// <param name="pt"></param>
        /// <returns></returns>
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern bool GetCursorPos(out POINT pt);

        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();
        #endregion
    }
 

[StructLayout(LayoutKind.Sequential)]
    public struct CopyDataStruc
    {
        public IntPtr dwData;
        public int cbData;  // 字串長度
        [MarshalAs(UnmanagedType.LPStr)]
        public string lpData; // 字串
    }

    public struct POINT
    {
        public int X;
        public int Y;
        public POINT(int x, int y)
        {
            this.X = x;
            this.Y = y;
        }
    }
 

無標題欄的視窗移動：

void title_MouseDown(object sender, MouseButtonEventArgs e)
        {
            Win32Api.ReleaseCapture();
            IntPtr handle = new WindowInteropHelper(this).Handle;
            Win32Api.PostMessage(handle, Win32Api.WM_SYSCOMMAND, Win32Api.SC_MOVE + Win32Api.HTCAPTION, IntPtr.Zero);
        }
 

程序通訊 之 傳送訊息：

hWnd = Win32Api.FindWindow(null, "window1");
if (hWnd != IntPtr.Zero)
            {
                CopyDataStruc data = new CopyDataStruc
                {
                    lpData = "Show",
                    dwData = IntPtr.Zero
                };
                data.cbData = System.Text.Encoding.Default.GetByteCount(data.lpData) + 1;
                Win32Api.SendMessage(hWnd, Win32Api.WM_COPYDATA, 0, ref data);
                KillProcess(current.Id.ToString(), current.ProcessName);
            }

程序通訊 之 接收訊息：

public MainWindow()
        {
            InitializeComponent();
            this.Loaded += new RoutedEventHandler(MainWindow_Loaded);
}
 void MainWindow_Loaded(object sender, RoutedEventArgs e)
        {
            (PresentationSource.FromVisual(this) as HwndSource).AddHook(new HwndSourceHook(this.WndProc));
}
IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {
            if (msg == Win32Api.WM_COPYDATA)
            {
                CopyDataStruc data = (CopyDataStruc)Marshal.PtrToStructure(lParam, typeof(CopyDataStruc));
                if (data.lpData == "Show")
                {      /*do something*/          }
            }
            return hwnd;
        }