uwp 如何加载本地图片更新image控件

        private async void Select_picture(object sender, RoutedEventArgs e)
        {
            FileOpenPicker openPicker = new FileOpenPicker();
            openPicker.ViewMode = PickerViewMode.Thumbnail;
            openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
            openPicker.FileTypeFilter.Add(".jpg");
            openPicker.FileTypeFilter.Add(".jpeg");
            openPicker.FileTypeFilter.Add(".png");

            StorageFile file = await openPicker.PickSingleFileAsync();
            if (file != null)
            {
                IRandomAccessStream ir = await file.OpenAsync(FileAccessMode.Read);
                BitmapImage bi = new BitmapImage();
                await bi.SetSourceAsync(ir);
                pic.Source = bi;
            }
        }

其中，pic为image控件的name。
当我们通过openPicker获得file后，将其导入到image即可。
Microsoft docs