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我有一个从选择器获得的图像文件。我将其保存为“me.png”：

Windows.Storage.ApplicationData.Current.LocalFolder

如果我再次执行该操作以尝试用新文件覆盖旧文件，应用程序将崩溃：

    An exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll but was not handled in user code

Additional information: Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))

If there is a handler for this exception, the program may be safely continued.

我用来覆盖文件的代码是：

            await file.CopyAsync(Windows.Storage.ApplicationData.Current.LocalFolder, "me.png", Windows.Storage.NameCollisionOption.ReplaceExisting);

知道为什么会这样吗？它第二次在该行代码上崩溃。如果我将冲突选项更改为 GenerateUniqueName 它可以正常工作，因此覆盖文件似乎是一个问题。

更新：

完整代码

    localSettings.Values["me_image_path"] = "Asssets/pinkBackground.png";
                 tile.BackgroundImage = localSettings.Values["me_image_path"];

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

            StorageFile file = await picker.PickSingleFileAsync();

            if (file == null) return;
            await file.CopyAsync(Windows.Storage.ApplicationData.Current.LocalFolder, "me.png", Windows.Storage.NameCollisionOption.ReplaceExisting);

            localSettings.Values["me_image_path"] = "ms-appdata:///local/me.png";
            tile.BackgroundImage = localSettings.Values["me_image_path"];
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