StorageFolder.GetFilesAsync() 冻结 UWP 和 WinRT 应用程序 [重复]

Question

我正在尝试将 xml 配置文件从安装目录移动到本地目录。当它到达 StorageFolder.GetFilesAsync() 时，它会冻结应用程序并且永远不会恢复。

我正在调用的代码位于 Windows RT 项目中，因此我无法在公共方法中使其异步。如果我将客户端 UWP 应用程序方法设为异步调用，似乎没有什么区别。

private async void InstallButton_Click(object sender, RoutedEventArgs e)
{
    await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
    {
        bool installed = FileManager.Install(StorageLocation.Local);
    });

}

public static bool Install(StorageLocation location)
{
    return InstallAsync(location).Result;
}  

private static async Task<bool> InstallAsync(StorageLocation location)
{
    try
    {
        StorageFolder destinationFolder = null;
        if (location == StorageLocation.Local)
        {
            destinationFolder = ApplicationData.Current.LocalFolder;
        }
        else if (location == StorageLocation.Roaming)
        {
            destinationFolder = ApplicationData.Current.RoamingFolder;
        }

        if (destinationFolder == null)
        {
            return false;
        }

        StorageFolder folder = Package.Current.InstalledLocation;
        if (folder == null)
        {
            return false;
        }

        // Language files are installed in a sub directory
        StorageFolder subfolder = await folder.GetFolderAsync(languageDirectory);
        if (subfolder == null)
        {
            return false;
        }

        // Get a list of files

        IReadOnlyList<StorageFile> files = await subfolder.GetFilesAsync();

        foreach (StorageFile file in files)
        {
            if (file.Name.EndsWith(".xml"))
            {
                await file.CopyAsync(destinationFolder);
            }
        }
    }
    catch (Exception)
    { }

    return IsInstalled(location);
}

Answer 1

要快速解决您的问题，请将该方法设为 public async 并将其传递给 RunAsync 调用。

private async void InstallButton_Click(object sender, RoutedEventArgs e)
{
    await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, async () =>
    {
        bool installed = await FileManager.InstallAsync(StorageLocation.Local);
    });
}

另外，FileManager 会修改 UI 吗？如果没有，您可以直接等待它而无需调度程序。

private async void InstallButton_Click(object sender, RoutedEventArgs e)
{
    bool installed = await FileManager.InstallAsync(StorageLocation.Local);
}