请教向桌面发送按键或者字符 - 编程论坛

这两段代码都不行，求助一下

程序代码：

IntPtr hWndParent = (IntPtr)FindWindowEx(0, 0, "WorkerW", null);
            IntPtr hWndItem;
            IntPtr hWnd;
            while (true)
            {
                hWndItem = (IntPtr)FindWindowEx((int)hWndParent, 0, "SHELLDLL_DefView", null);
                if (hWndItem != IntPtr.Zero)
                {
                    hWnd = (IntPtr)FindWindowEx((int)hWndItem, 0, "SysListView32", "FolderView");
                    break;
                }
                hWndParent = (IntPtr)FindWindowEx(0, (int)hWndParent, "WorkerW", null);
            }


            // 激活
            // SetActiveWindow(GetDesktopWindow());
            // SetActiveWindow(tempHwnd);
            //  SetForegroundWindow(parent);
            // SetFocus(hWndItem);

            SendKeys.Send("as");
            SendKeys.SendWait("df");

程序代码：

IntPtr pWnd = FindWindow("Progman", null);
            pWnd = FindWindowEx(pWnd, IntPtr.Zero, "SHELLDLL_DefVIew", null);
           pWnd = FindWindowEx(pWnd, IntPtr.Zero, "SysListView32", null);
           // pWnd = FindWindowEx(pWnd, IntPtr.Zero, "SysListView32", "FolderView");
         // IntPtr tWnd = new System.Windows.Interop.WindowInteropHelper(this).Handle;

            SetParent(this.Handle, pWnd);
            SendKeys.Send("as");
            SendKeys.SendWait("df");