UWP

Question

我的 Application class.

中有属性 Files 类型 ObservableCollection<Element>

public sealed partial class App : Application
{
    public string CurrentPath;

    public ObservableCollection<Element> Files;

    public async void RefreshFilesAsync()
    {
        Files.Clear();

        var folder = await StorageFolder.GetFolderFromPathAsync(CurrentPath);
        var foldersRequest = folder.GetFoldersAsync();
        var filesRequest = folder.GetFilesAsync();

        var folders = await foldersRequest;
        var files = await filesRequest;

        foreach (StorageFolder directory in folders)
        {
            Files.Add(new FolderElement(directory));
        }

        foreach (StorageFile file in files)
        {
            Files.Add(new FileElement(file));
        }
    }

    // ...

}

Element 是我的 class 对象的包装器 StorageFile。这样做 class 以便为名称属性设置新值会调用 API 重命名实际文件。

public class Element
{
    public string Name
    {
        get => StorageFile.Name;
        set =>
        {
            StorageFolder.RenameAsync(value, NameCollisionOption.GenerateUniqueName).Completed = (IAsyncAction act, AsyncStatus status) =>
            {
                (App.Current as App).RefreshFilesAsync();
            };
        }
    }

    public StorageFile StorageFile { get; }

    //...

}

我有一个 DataGrid 链接到应用程序属性 Files，因此您可以推断，每当我重命名文件名的列时，API 是调用以执行真正的重命名。

这是我的问题发生的时间。 API 调用成功并且文件被重命名，但是在 RefreshFilesAsync() 中，当调用 Files.Clear(); 时，我得到一个异常 The application called an interface that was marshalled for a different thread.

我哪里错了？

Answer 1

为了运行代码与UI线程，我使用了Window.Current.Dispatcher.RunAsync()，并将其放在一个单独的异步方法中。异常不再出现。

public string Name
{
    get => StorageFolder.Name;
    set => RenameAsync(value);
}

private async void RenameAsync(string newName)
{
    await StorageFolder.RenameAsync(newName, NameCollisionOption.GenerateUniqueName);
    await Window.Current.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => (App.Current as App).RefreshFilesAsync());
}

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.net

c#

ui-thread

storagefile