WPF设置窗体最前端显示

  [DllImport("user32.dll")]

        private static extern int SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, int uFlags);

        static readonly IntPtr HWND_TOPMOST = new IntPtr(-1);

        const int SWP_SHOWWINDOW = 0x0040;

在load下面代码：

     //Join WinAPI Setting Focse();  

            IntPtr handle = new WindowInteropHelper(this).Handle;

            SetWindowPos(handle, HWND_TOPMOST, 0, 0, 100, 200, SWP_SHOWWINDOW);