c# - CreateStreamedFileFromUriAsync：如何传递 IRandomAccessStreamReference？

Question

我正在尝试使用StorageFile方法 下载文件，CreateStreamedFileFromUriAsync但我对IRandomAccessStreamReference参数感到困惑。如何传递 IRandomAccessStreamReference？它是一个接口。我该怎么办？

public static IAsyncOperation<StorageFile> CreateStreamedFileFromUriAsync(
    string displayNameWithExtension, 
    Uri uri, 
    IRandomAccessStreamReference thumbnail
)

Answer 1

我找到了答案：

IRandomAccessStreamReference thumbnail =
    RandomAccessStreamReference.CreateFromUri(new Uri(remoteUri));
IAsyncOperation<StorageFile> file1 =
    StorageFile.CreateStreamedFileFromUriAsync("duyuru.pdf", new Uri(remoteUri), thumbnail);