WPF将窗体设置为桌面背景【动态桌面】

#region MyRegion
        private IntPtr programIntPtr = IntPtr.Zero;
        bool inited { get; set; }
        public void Init()
        {
            try
            {
                if (inited) return;
                // 通过类名查找一个窗口，返回窗口句柄。
                programIntPtr = Win32.FindWindow("Progman", null);

                // 窗口句柄有效
                if (programIntPtr != IntPtr.Zero)
                {
                    IntPtr result = IntPtr.Zero;

                    // 向 Program Manager 窗口发送 0x52c 的一个消息，超时设置为0x3e8（1秒）。
                    Win32.SendMessageTimeout(programIntPtr, 0x52c, IntPtr.Zero, IntPtr.Zero, 0, 0x3e8, result);

                    // 遍历顶级窗口
                    Win32.EnumWindows((hwnd, lParam) =>
                    {
                        // 找到包含 SHELLDLL_DefView 这个窗口句柄的 WorkerW
                        if (Win32.FindWindowEx(hwnd, IntPtr.Zero, "SHELLDLL_DefView", null) != IntPtr.Zero)
                        {
                            // 找到当前 WorkerW 窗口的，后一个 WorkerW 窗口。 
                            IntPtr tempHwnd = Win32.FindWindowEx(IntPtr.Zero, hwnd, "WorkerW", null);

                            // 隐藏这个窗口
                            Win32.ShowWindow(tempHwnd, 0);
                        }
                        return true;
                    }, IntPtr.Zero);
                }

                Win32.SetParent(new System.Windows.Interop.WindowInteropHelper(this).Handle, programIntPtr);
                inited = true;

            }
            catch (Exception ex)
            {
            }
        }
        #endregion

public static class Win32
    {
        [DllImport("user32.dll")]
        public static extern IntPtr FindWindow(string className, string winName);

        [DllImport("user32.dll")]
        public static extern IntPtr SendMessageTimeout(IntPtr hwnd, uint msg, IntPtr wParam, IntPtr lParam, uint fuFlage, uint timeout, IntPtr result);

        [DllImport("user32.dll")]
        public static extern bool EnumWindows(EnumWindowsProc proc, IntPtr lParam);
        public delegate bool EnumWindowsProc(IntPtr hwnd, IntPtr lParam);

        [DllImport("user32.dll")]
        public static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string className, string winName);

        [DllImport("user32.dll")]
        public static extern bool ShowWindow(IntPtr hwnd, int nCmdShow);

        [DllImport("user32.dll")]
        public static extern IntPtr SetParent(IntPtr hwnd, IntPtr parentHwnd);
    }