Question

我试图下载放在互联网上的RSS源的XML源代码，但是当我的进程到达WebResponse语句（第二行下面）时，进程停止，并且没有任何下一步发生。没有错误，没有例外，或者没有这样的。我等了几十分钟，但仍然没有发生任何事情。

WebRequest request = WebRequest.Create(source.Url);
WebResponse response = await request.GetResponseAsync(); // at this line it stops
Stream receiveStream = response.GetResponseStream();
StreamReader readStream = new StreamReader(receiveStream);

string xml = readStream.ReadToEnd().Trim();

readStream.Dispose();
response.Dispose();

知道导致它的原因吗？

编辑：

public static async Task<string> GetContent(string uri)
{
    WebRequest request = WebRequest.Create(url);

    using (WebResponse response = await request.GetResponseAsync().ConfigureAwait(false))
    {
        Stream receiveStream = response.GetResponseStream();
        StreamReader readStream = new StreamReader(receiveStream);

        return readStream.ReadToEnd().Trim();
    }
}

public async Task<ObservableCollection<Source>> GetArticlesFromSource()
{
    sourceDefinitions = await GetSourceDefinitions();

    string imageFolderName = "ArticleImages";
    string imageFolderPath = localFolder.Path + "\\" + imageFolderName;
    StorageFolder imageFolder = await localFolder.CreateFolderAsync(imageFolderName, CreationCollisionOption.ReplaceExisting);

    foreach (var source in sourceDefinitions)
    {
        if (source.Selected == "true")
        {
            ObservableCollection<Article> articlesStep1 = new ObservableCollection<Article>();
            /*WebRequest request = WebRequest.Create(source.Url);
            WebResponse response = await request.GetResponseAsync();
            Stream receiveStream = response.GetResponseStream();
            StreamReader readStream = new StreamReader(receiveStream);*/

            string xml = await GetContent("http://www.honzachalupa.cz/").ConfigureAwait(false);

            Debug.WriteLine(xml);
            ...

Answer 1

您的应用程序几乎肯定会在调用堆栈上方的返回任务上调用Wait或Result，并且我在我的博客上完整地解释了此will cause a deadlock。

要解决此问题，请找到上游Wait / Result来电并将其更改为await。换句话说，一直使用＆＃34; async＆＃34;。

C＃ - 从WebResponse获得响应

1 个答案: