c# - HttpClient getAsync 卡在较大的文件上

Question

如果这个问题之前已经被回答过，我很抱歉，但没有一个答案对我有帮助。我的 WebView 有一个事件:

private async void MainWebView_UnviewableContentIdentified(WebView sender, WebViewUnviewableContentIdentifiedEventArgs args)
{
    await downloadFromUri(args.Uri).ConfigureAwait(false);
}

我的 downloadFromUri 方法将尝试下载文件并将其存储在下载文件夹中，最后它将打开该文件:

    static async Task downloadFromUri(Uri uri)
    {
        var url = uri;

        HttpClient client = new HttpClient();

        client.DefaultRequestHeaders.TryAppendWithoutValidation(
          "Authorization Bearer",
              " MYTOKEN"
              );

        Debug.WriteLine("Attempting GET request");

        var response = await client.GetAsync(url);

        Debug.WriteLine("Got response.. checking " + response.StatusCode);


        if (response.IsSuccessStatusCode)
        {
            Debug.WriteLine("Okay, we've got a response");
            var responseFileName = response.Content.Headers.ContentDisposition.FileName;

            Debug.WriteLine("Filename: " + responseFileName);

            var ManualFile = await DownloadsFolder.CreateFileAsync(responseFileName, CreationCollisionOption.GenerateUniqueName);

            Debug.WriteLine("Creating buffer: ");
            var buffer = await client.GetBufferAsync(url);

            Debug.WriteLine("Writing buffer.");
            await Windows.Storage.FileIO.WriteBufferAsync(ManualFile, buffer);

            Debug.WriteLine("Done, opening");

            var openOptions = new Windows.System.LauncherOptions();
            openOptions.DisplayApplicationPicker = true;

            var openFile = await Windows.System.Launcher.LaunchFileAsync(ManualFile, openOptions);
        }
        else
        {
            Debug.WriteLine(response.StatusCode.ToString());
        }     
    }

问题是，这段代码似乎可以在小型 PDF 或 zip 文件上正常工作。但当 PDF 文件大于 10mb 时，应用程序就会卡在以下行:

var response = await client.GetAsync(url);

我该怎么做才能让这项工作成功？预先非常感谢!

注意:我使用的是 Windows.Web.Http.HttpClient，而不是 System.Net.Http.HttpClient。

编辑:我尝试跳过 client.GetAsync(url) 并直接运行 var buffer = wait client.GetBufferAsync(url); 。这也陷入了困境。

Answer 1

也许对于较大的文件，最好使用

Windows.Networking.BackgroundTransfer

命名空间，如BackgroundDownloader？