Calling an asynchronous method causes a debug

Question

I ran into a problem while developing a program on UWP. I need to open a dialog box for the user to select a save folder. When calling the method StorageFile file = await openPicker.PickSingleFileAsync(); the program calls the debugger.

The complete method:

private async void OpenFolderButton_Click(object sender, RoutedEventArgs e)
{
    FileOpenPicker openPicker = new FileOpenPicker();
    openPicker.ViewMode = PickerViewMode.Thumbnail;
    openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;

    StorageFile file = await openPicker.PickSingleFileAsync();
    if (file != null)
        filePath.Text = file.Path;
}

I tried to look at the code examples on the Microsoft website.

Answer 1

You should add FileTypeFilter to specify file types.

       FileOpenPicker openPicker = new FileOpenPicker();
       openPicker.ViewMode = PickerViewMode.Thumbnail;
       openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
       // set file type to show
       openPicker.FileTypeFilter.Add("*");
       StorageFile file = await openPicker.PickSingleFileAsync();

For more details you could refer to the Doc:Pick a single file: step-by-step