Question

我使用httpwebrequest将其他网站的内容导入我的Windows手机应用程序，如下所示。我想获取页面的html，然后解析它以获得我想要的数据。

private void Button_Click(object sender, RoutedEventArgs e)
        {
            System.Uri targetUri = new System.Uri("http://www.contoso.com");
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(targetUri);
            request.BeginGetResponse(new AsyncCallback(ReadWebRequestCallback), request); 
        }

        private void ReadWebRequestCallback(IAsyncResult callbackResult)
        {
            HttpWebRequest myRequest = (HttpWebRequest)callbackResult.AsyncState;
      HttpWebResponse myResponse=(HttpWebResponse)myRequest.EndGetResponse(callbackResult);// Exception is showing here.

            using (StreamReader httpwebStreamReader = new StreamReader(myResponse.GetResponseStream()))
            {
                string results = httpwebStreamReader.ReadToEnd();
                //TextBlockResults.Text = results; //-- on another thread!
                Dispatcher.BeginInvoke(() => TextBlockResults.Text = results);
            }
            myResponse.Close();
        }

但是收到以下错误：

{System.Net.WebException：远程服务器返回错误：未找到。 ---＆GT; System.Net.WebException：远程服务器返回了一个错误：NotFound。在 System.Net.Browser.ClientHttpWebRequest.InternalEndGetResponse（IAsyncResult的 asyncResult）at System.Net.Browser.ClientHttpWebRequest＆LT;＆GT; C_ DisplayClasse.b _d（对象 sendState）at System.Net.Browser.AsyncHelper＆LT;＆GT; C_ DisplayClass1.b _0（对象 sendState）---内部异常堆栈跟踪结束--- at System.Net.Browser.AsyncHelper.BeginOnUI（SendOrPostCallback beginMethod，Object state）at System.Net.Browser.ClientHttpWebRequest.EndGetResponse（IAsyncResult的 asyncResult）在myApplication.MainPage.RespCallback（IAsyncResult asynchronousResult）}

可能是什么问题？任何帮助将不胜感激。感谢。

Answer 1

试试这段代码（WebClient）：

public void Client(string uri)
{
    var clientToken = new WebClient();
    clientToken.OpenReadCompleted += clientToken_OpenReadCompleted;
    clientToken.OpenReadAsync(new Uri(uri));
}

private void clientToken_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
    if (e.Error == null)
    {
       Stream reply = e.Result;
       StreamReader reader = new StreamReader(reply);

       MessageBox.Show(reader.ReadToEnd());
    }
}

或阅读此帖Portable HttpClient for .NET Framework and Windows Phone

获取另一个网站的内容到我的Windows Phone 8应用程序

1 个答案: