c# 列举所有窗口和子窗口

private delegate bool WNDENUMPROC(IntPtr hWnd, int lParam);

        [DllImport("user32.dll", ExactSpelling = true)]
        private static extern bool EnumChildWindows(IntPtr hwndParent, WNDENUMPROC lpEnumFunc, int lParam); 

        [DllImport("user32.dll")]
        private static extern bool EnumWindows(WNDENUMPROC lpEnumFunc, int lParam);
        //[DllImport("user32.dll")]
        //private static extern IntPtr FindWindowW(string lpClassName, string lpWindowName);
        [DllImport("user32.dll")]
        private static extern int GetWindowTextW(IntPtr hWnd, [MarshalAs(UnmanagedType.LPWStr)]StringBuilder lpString, int nMaxCount);
        [DllImport("user32.dll")]
        private static extern int GetClassNameW(IntPtr hWnd, [MarshalAs(UnmanagedType.LPWStr)]StringBuilder lpString, int nMaxCount);
        public struct WindowInfo
        {
            public IntPtr hWnd;
            public string szWindowName;
            public string szClassName;
        }

        private List<WindowInfo> EnumChildWindowsCallback(IntPtr handle, string name, string classname)
        {
            List<WindowInfo> wndList = new List<WindowInfo>();
            EnumChildWindows(handle,delegate(IntPtr hWnd, int lParam)
            {
                WindowInfo wnd = new WindowInfo();
                StringBuilder sb = new StringBuilder();
                //get hwnd
                wnd.hWnd = hWnd;
                //get window name
                GetWindowTextW(hWnd, sb, sb.Capacity);
                wnd.szWindowName = sb.ToString();
                //get window class
                GetClassNameW(hWnd, sb, sb.Capacity);
                wnd.szClassName = sb.ToString();
                //add it into list
                wndList.Add(wnd);
                return true;
            },);
            return wndList.Where(it => it.szWindowName == name && it.szClassName == classname).ToList();
        } 

        public List<WindowInfo> GetAllDesktopWindows(string name,string classname)
        {
            List<WindowInfo> wndList = new List<WindowInfo>();

            //enum all desktop windows
            EnumWindows(delegate(IntPtr hWnd, int lParam)
            {
                WindowInfo wnd = new WindowInfo();
                StringBuilder sb = new StringBuilder();
                //get hwnd
                wnd.hWnd = hWnd;
                //get window name
                GetWindowTextW(hWnd, sb, sb.Capacity);
                wnd.szWindowName = sb.ToString();
                //get window class
                GetClassNameW(hWnd, sb, sb.Capacity);
                wnd.szClassName = sb.ToString();
                //add it into list
                wndList.Add(wnd);
                return true;
            }, );

            return wndList.Where(it => it.szWindowName == name && it.szClassName ==classname ).ToList();
        }