如何使用 Windows.Web.Http 下载和存储图像？

如何使用 Windows.Web.Http 从 Internet 下载 jpeg 图像并将其存储在 Windows 应用商店应用程序中？

我面临的问题是我不知道必须对图像使用什么 Get…Async 和 Write…Async 方法？文件与字符串有很大不同。

仅 Windows.Web.Http!

没有第三方解决方案!

如果您有其他建议，请使用评论部分，而不是答案。谢谢你！

…    
using Windows.Storage;
using Windows.Web.Http;

Uri uri = new Uri("http://image.tmdb.org/t/p/w300/" + posterPath);
HttpClient httpClient = new HttpClient();

// I guess I need to use one of the Get...Async methods?
var image = await httpClient.Get…Async(uri);

StorageFolder localFolder = ApplicationData.Current.LocalFolder;
StorageFolder cachedPostersFolder = await localFolder.CreateFolderAsync("cached posters", CreationCollisionOption.OpenIfExists);

StorageFile posterFile = await cachedPostersFolder.CreateFileAsync(posterPath, CreationCollisionOption.ReplaceExisting);

// I guess I need to use one of the Write...Async methods?
await FileIO.Write…Async(posterFile, image);

您可以使用以下命令获取缓冲区GetBufferAsync http://msdn.microsoft.com/en-us/library/windows/apps/windows.web.http.httpclient.getbufferasync方法，然后调用FileIO.WriteBufferAsync http://msdn.microsoft.com/en-us/windows.storage.fileio.writebufferasync将缓冲区写入文件：

Uri uri = new Uri("https://i.stack.imgur.com/ZfLdV.png?s=128&g=1");
string fileName = "daniel2.png";

StorageFile destinationFile = await KnownFolders.PicturesLibrary.CreateFileAsync(
      fileName, CreationCollisionOption.GenerateUniqueName);


HttpClient client = new HttpClient();

var buffer = await client.GetBufferAsync(uri);
await Windows.Storage.FileIO.WriteBufferAsync(destinationFile, buffer);