Question

我正在使用该代码来选择一个文件夹，它工作得很好。

FolderPicker folderPicker = new FolderPicker();
folderPicker.SuggestedStartLocation = PickerLocationId.Desktop;
folderPicker.FileTypeFilter.Add("*");
StorageFolder pickedFolder = await folderPicker.PickSingleFolderAsync();

但是当我在特定功能中使用它时，我不知道为什么突然不起作用了。

这就是我从按钮单击到FolderPicker弹出窗口的全部操作。

按钮单击：

private async void BRechercherPoste_Click(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
    if (tbCodePoste != null && !tbCodePoste.Text.Equals(""))
    {
        string codePoste = tbCodePoste.Text;

        //recuperation des infos du poste
        await ViewModel.getPosteInformationsAsync(codePoste);
    }
}

...然后是ViewModel.getPosteInformationsAsync：

public async Task getPosteInformationsAsync(string posteNumber)
{
    ApplicationDataContainer localSettings = ApplicationData.Current.LocalSettings;

    await setupFiles();

    [some code not interferring here]
}

... setupFiles：

public static async Task setupFiles()
{
    //checks for the first time app launch 
    if (!await checkIfPosteFolderPresentAsync())
    {}
        PosteChoiceDialog dialogChoice = new PosteChoiceDialog();
        //showing a dialog with 2 choices
        await dialogChoice.ShowAsync();
    }

    [rest of the code (working)]
}

因此该对话框显示2个选择，一个将默认数据加载到LocalFolder中，另一个使您选择一个个人文件夹将数据加载到LocalFolder中。

选择第二个选项时触发的功能是：

public static async Task loadCustomPosteInformation()
{
    StorageFolder localFolder = ApplicationData.Current.LocalFolder;

    FolderPicker folderPicker = new FolderPicker();
    folderPicker.SuggestedStartLocation = PickerLocationId.Desktop;
    folderPicker.FileTypeFilter.Add("*");
    //---Here the folder picker open and closes instantly for no reason---//
    StorageFolder pickedFolder = await folderPicker.PickSingleFolderAsync();
    //--------------------------------------------------------------------//

    //Because it's not working the rest of the function crashes
    if (pickedFolder == null)
    {
        await loadDefaultPosteInformation();
    }
    else
    {
        var files = await pickedFolder.GetFilesAsync();
        StorageFolder postes = await localFolder.CreateFolderAsync("Postes");

        foreach (StorageFile f in files)
        {
            await f.CopyAsync(postes);
        }
    }
}

所以我详细介绍了所有可能的信息，因为我花了几个小时搜索它崩溃的原因，而且我真的不明白为什么FolderPicker仅在该特定函数中始终立即关闭。

Answer 1

可能与PickSingleFolderAsync()调用不在UI线程中有关，尽管如果是这种情况，我不知道为什么它会首先打开（或关闭）。

仍然，为什么不尝试从UI线程调用StorageFolder.PickSingleFolderAsync()：

StorageFolder pickedFolder;
var completionSource = new TaskCompletionSource<StorageFolder>();
var folderDialogTask = completionSource.Task;
Window.Current.Dispatcher.RunAsync(CoreDispatcherPriority.High,
async () =>
{
      var folder = await folderPicker.PickSingleFolderAsync();
      completionSource.SetResult(folder);
});`
pickedFolder = await folderDialogTask;

FolderPicker无缘无故立即关闭

1 个答案: