當使用winform啟動WPF應用時，傳參比較簡單，直接使用程序之間傳遞引數，若winform向已啟動的WPF中傳引數，則使用訊息處理

winform程式，本例使用控制檯

實體類 

namespace ConsoleApplication1
{
     [StructLayout(LayoutKind.Sequential)]
        public struct Entity
        {
            public IntPtr dwData;

            public int cbData;

            [MarshalAs(UnmanagedType.LPStr)]

            public string lpData;

        } 
}
 

</pre><pre name="code" class="csharp">

傳送端（控制檯程式）

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string ch = ""; 
            while (ch.ToLower() != "q") 
            {

                if (!SendMessage("MainWindow",ch)) 
                {
                    Console.WriteLine("無視窗MainWindow");

                }; 
                ch = Console.ReadLine(); 
            } 
        }

         public static bool SendMessage(string windowName, string strMsg) 
        { 
            if (strMsg == null) return true; 
            IntPtr hwnd = (IntPtr)FindWindow(null, windowName   ); 
            if (hwnd != IntPtr.Zero) 
            {
                Entity entity;
                entity.dwData = IntPtr.Zero;
                entity.lpData = strMsg;
                entity.cbData = System.Text.Encoding.Default.GetBytes(strMsg).Length + 1; 
                int fromWindowHandler = 0;
               //處理為非0，未處理0
           int result = SendMessage(hwnd, 0x004A, fromWindowHandler, ref entity); 
           Console.WriteLine(result);
                return true; 
            } 
            return false; 
        } 

        [DllImport("User32.dll", EntryPoint = "FindWindow")] 
        private static extern int FindWindow(string lpClassName, string lpWindowName); 

        [DllImport("User32.dll", EntryPoint = "SendMessage")] 




        private static extern int SendMessage 
        ( 

        IntPtr hWnd, 

        int Msg, 

        int wParam,

         ref Entity lParam 

        ); 

    }
}
 

namespace WpfApplication29
{
	/// <summary>
	/// MainWindow.xaml 的互動邏輯
	/// </summary>
	public partial class MainWindow : Window
	{
		public MainWindow()
		{
			this.InitializeComponent();

			// 在此點下面插入建立物件所需的程式碼。
		}


        IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
        {

            if (msg == 0x004A)
            {
                Entity obj = (Entity)System.Runtime.InteropServices.Marshal.PtrToStructure(lParam, typeof(Entity));
               if(obj.lpData.Trim()!="")
               {
                   MessageBox.Show(obj.lpData);
 

 <span style="white-space:pre">		</span>   handled = true;//指示訊息是否已處理
               }
            }

            return hwnd;

        }

        private void WindowLoaded(object sender, RoutedEventArgs e)
        {
            (PresentationSource.FromVisual(this) as System.Windows.Interop.HwndSource).AddHook(new System.Windows.Interop.HwndSourceHook(WndProc)); 
        } 

	}
}