FileOpenPicker PickSingleFileAsync引发UnauthorizedAccessException

问题描述

对于 FileOpenPicker 类.

FileOpenPicker picker = new FileOpenPicker();
picker.ViewMode = PickerViewMode.Thumbnail;
picker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
picker.FileTypeFilter.Add(".png");
picker.FileTypeFilter.Add(".jpg");
picker.FileTypeFilter.Add(".jpeg");

StorageFile file = await picker.PickSingleFileAsync();

当我通过按钮触发它时，我从最后一行得到以下异常:

When I trigger it from a button I get the following exception from the last line:

我认为在这种用法中使用FileOpenPicker的想法是，我不需要询问用户访问权限或指定任何功能?

I thought the idea of the FileOpenPicker in this usage was that I didn't need to ask the user for access permissions or specify any capabilities?

推荐答案

我在调用PickSingleFileAsync()之前设置了一个断点.事实证明，在边框内按下TextBlock时会触发两个轻击事件(两者都具有相同的轻击事件处理程序).

I set a breakpoint just before the call to PickSingleFileAsync(). Turns out that two tapped events were being fired when pressing a TextBlock within a Border (both with the same Tapped event handler).

第一个调用按预期工作，但随后的调用导致UnauthorizedAccessException，并且将在显示选择器后立即发生.

The first call worked as expected, but subsequent call resulted in the UnauthorizedAccessException and would occur straight after the picker was displayed.

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