使用以下代码,我可以获得IRandomAccessStreamWithContentType
代表联系人的拇指
var contactPicker = new ContactPicker();
contactPicker.SelectionMode = ContactSelectionMode.Contacts;
var contact = await contactPicker.PickSingleContactAsync();
var thumb = await contact.GetThumbnailAsync();
但是处理IRandomAccessStreamWithContentType
获取图像实例和图像文件的最佳方法是什么?