Question

我有一个WPF C＃项目，我正在实现Windows文件夹选项的设置。其中之一是“单击以打开项目”（而不是双击）。当我更改注册表项时，我需要刷新我找到解决方案的Windows资源管理器。但桌面不刷新，甚至手动刷新它不会应用更改。我使用了IActiveDesktop :: ApplyChanges方法，但没有用（或者我犯了一个错误）。我也使用了这段代码片段，但它仍然没有应用我所做的更改：

SHChangeNotify(0x8000000, 0x1000, IntPtr.Zero, IntPtr.Zero);

这是我用来刷新Win Explorer的完整代码片段（女巫来自这个网站）：

[System.Runtime.InteropServices.DllImport("Shell32.dll")]
    private static extern int SHChangeNotify(int eventId, int flags, IntPtr item1, IntPtr item2);

    public static void RefreshWindowsExplorer()
    {
        // Refresh the desktop
        SHChangeNotify(0x8000000, 0x1000, IntPtr.Zero, IntPtr.Zero);

        // Refresh any open explorer windows
        // based on http://stackoverflow.com/questions/2488727/refresh-windows-explorer-in-win7
        Guid CLSID_ShellApplication = new Guid("13709620-C279-11CE-A49E-444553540000");
        Type shellApplicationType = Type.GetTypeFromCLSID(CLSID_ShellApplication, true);

        object shellApplication = Activator.CreateInstance(shellApplicationType);
        object windows = shellApplicationType.InvokeMember("Windows", System.Reflection.BindingFlags.InvokeMethod, null, shellApplication, new object[] { });

        Type windowsType = windows.GetType();
        object count = windowsType.InvokeMember("Count", System.Reflection.BindingFlags.GetProperty, null, windows, null);
        for (int i = 0; i < (int)count; i++)
        {
            object item = windowsType.InvokeMember("Item", System.Reflection.BindingFlags.InvokeMethod, null, windows, new object[] { i });
            Type itemType = item.GetType();

            // Only refresh Windows Explorer, without checking for the name this could refresh open IE windows
            string itemName = (string)itemType.InvokeMember("Name", System.Reflection.BindingFlags.GetProperty, null, item, null);
            if (itemName == "Windows Explorer")
            {
                itemType.InvokeMember("Refresh", System.Reflection.BindingFlags.InvokeMethod, null, item, null);
            }
        }
    }

适用于Windows资源管理器，但不适用于桌面（这是奇怪的，因为桌面也依赖于资源管理器）。那么我应该如何重新加载桌面以使我的更改生效？

Answer 1

感谢您的所有回复和评论。我终于想出了解决这个问题的方法。我们可以隐藏所有桌面图标，然后再次显示它们。这将强制桌面重新加载。

更新：在窗口8中，SHELLDLL_DefView是其中一个WorkerW个窗口的子项。（而不是Progman）所以这里是更新的代码，它也适用于Windows 8和8.1：

    [DllImport("user32.dll", SetLastError = true)]
    static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

    [DllImport("user32.dll", SetLastError = true)]
    static extern IntPtr GetWindow(IntPtr hWnd, GetWindow_Cmd uCmd);

    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);

    enum GetWindow_Cmd : uint
    {
        GW_HWNDFIRST = 0,
        GW_HWNDLAST = 1,
        GW_HWNDNEXT = 2,
        GW_HWNDPREV = 3,
        GW_OWNER = 4,
        GW_CHILD = 5,
        GW_ENABLEDPOPUP = 6
    }

    private const int WM_COMMAND = 0x111;

    [DllImport("user32.dll", SetLastError = true)]
    static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

    private delegate bool EnumWindowsProc(IntPtr hWnd, IntPtr lParam);

    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    private static extern int GetWindowText(IntPtr hWnd, StringBuilder strText, int maxCount);

    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    private static extern int GetWindowTextLength(IntPtr hWnd);

    [DllImport("user32.dll")]
    private static extern bool EnumWindows(EnumWindowsProc enumProc, IntPtr lParam);

    [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
    static extern int GetClassName(IntPtr hWnd, StringBuilder lpClassName, int nMaxCount);


    public static string GetWindowText(IntPtr hWnd)
    {
        int size = GetWindowTextLength(hWnd);
        if (size++ > 0)
        {
            var builder = new StringBuilder(size);
            GetWindowText(hWnd, builder, builder.Capacity);
            return builder.ToString();
        }

        return String.Empty;
    }

    public static IEnumerable<IntPtr> FindWindowsWithClass(string className)
    {
        IntPtr found = IntPtr.Zero;
        List<IntPtr> windows = new List<IntPtr>();

        EnumWindows(delegate(IntPtr wnd, IntPtr param)
        {
            StringBuilder cl = new StringBuilder(256);
            GetClassName(wnd, cl, cl.Capacity);
            if (cl.ToString() == className && (GetWindowText(wnd) == "" || GetWindowText(wnd) == null))
            {
                windows.Add(wnd);
            }
            return true;
        },
                    IntPtr.Zero);

        return windows;
    }

    static void ToggleDesktopIcons()
    {
        var toggleDesktopCommand = new IntPtr(0x7402);
        IntPtr hWnd = IntPtr.Zero;
        if (Environment.OSVersion.Version.Major < 6 || Environment.OSVersion.Version.Minor < 2) //7 and -
            hWnd = GetWindow(FindWindow("Progman", "Program Manager"), GetWindow_Cmd.GW_CHILD);
        else
        {
            var ptrs = FindWindowsWithClass("WorkerW");
            int i = 0;
            while (hWnd == IntPtr.Zero && i < ptrs.Count())
            {
                hWnd = FindWindowEx(ptrs.ElementAt(i), IntPtr.Zero, "SHELLDLL_DefView", null);
                i++;
            }
        }
        SendMessage(hWnd, WM_COMMAND, toggleDesktopCommand, IntPtr.Zero);
    }

现在我们可以两次切换桌面图标：

        ToggleDesktopIcons();
        ToggleDesktopIcons();

希望这有助于其他人...

Answer 2

如果您已发布更改该设置的代码，我会在回复之前根据以下建议对其进行测试。

你试过了吗？

1）从上面的代码中删除语句if (itemName == "Windows Explorer")，以便刷新每个窗口（包括桌面）？

2）通过SendMessage WIN32 API广播WM_SETTINGCHANGE？

private const int HWND_BROADCAST = 0xffff;
private const int WM_WININICHANGE = 0x001a, WM_SETTINGCHANGE = 0x001a, INI_INTL = 1;
[DllImport("user32.dll")]
private static extern int SendMessage(int hWnd, uint wMsg, uint wParam, uint lParam);

SendMessage(HWND_BROADCAST, WM_SETTINGCHANGE, 0, INI_INTL);

[Credit]

3）IActiveDesktop.ApplyChanges

[ComImport]
[Guid("F490EB00-1240-11D1-9888-006097DEACF9")]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IActiveDesktop
{
     [PreserveSig]
     int ApplyChanges(AD_Apply dwFlags);
     // [...]
     // Note: There is a lot more to this interface,
     //        please see PInvoke.net link below.
}
private const int AD_APPLY_REFRESH = 4;

IActiveDesktop.ApplyChanges(AD_APPLY_REFRESH);

[PInvoke.net - IActiveDesktop]

如果这些不起作用，请告诉我。如果它归结为它，可以保存所有打开的资源管理器窗口＆amp;他们的位置，终止资源管理器，等待资源管理器重新启动，重新打开每个资源管理器窗口并重新定位它们......如果可以接受的话。

希望这有帮助。

如何刷新/重新加载桌面

2 个答案: