在 WebClient wp7 中重定向时获取当前 Uri

问题描述：

我希望我不会开始一个已经完成的话题，但我在这里也没有找到任何正确的答案.所以我们开始:我使用 WebClient 从网页下载 HTML 代码，然后使用该 WebClient 发送新请求，WebPage 重定向我.现在我想要现在站点放置我的位置.

I hope that I won't start a topic that's done already but I didn't find any proper answer here nor anywere else. So here we go: I use a WebClient to download HTML Code from a webpage, then I send a new request with that WebClient and the WebPage redirects me. Now I want to now where the Site has put me.

WebClient 类本身没有任何合适的属性，我已经尝试重写该类以便获得响应 URI，但不知何故它不适用于 wp7.

The WebClient Class itself doesn't have any suitable properties, I already tried to rewrite the class so that I could get the Response URI but somehow it doesn't work for wp7.

那么任何想法如何获取我的 WebClient 被重定向的 URI?或者知道为什么当我想使用我自己的类时应用程序崩溃:

So any ideas how to get the URI where my WebClient got redirected? Or any idea why the application crashes when I want to use my own class:

    public class MyWebClient : WebClient
    {
            Uri _responseUri;

            public Uri ResponseUri
            {
                get { return _responseUri; }
            }
            protected override WebResponse GetWebResponse(WebRequest request, IAsyncResult result)
            {
                WebResponse response = base.GetWebResponse(request, result);
                _responseUri = response.ResponseUri;
                return response;
            }
        }
}

提前致谢！

答

HttpWebRequest 是这里的解决方案，因为 WebClient 无论如何都是它的包装器.这样的事情应该适用于您的特定情况:

HttpWebRequest is the solution here, since WebClient is a wrapper around it anyway. Something like this should work for your specific situation:

private HttpWebRequest request;
private bool flagIt = true;

public MainPage()
{
    InitializeComponent();

    request = (HttpWebRequest)WebRequest.Create("http://google.com");
    request.BeginGetResponse(new AsyncCallback(GetData), request);
}

public void GetData(IAsyncResult result)
{
    HttpWebRequest request = (HttpWebRequest)result.AsyncState;
    HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(result);

    Debug.WriteLine(response.ResponseUri.ToString());

    if (flagIt)
    {
        request = (HttpWebRequest)WebRequest.Create("http://microsoft.com");
        request.BeginGetResponse(new AsyncCallback(GetData), request);
        flagIt = false;
    }
}

我在主页面构造函数中发起请求，然后在回调中处理它.请注意我如何获得 ResponseUri - 您的最终目的地.

I am initiating the request in the main page constructor and then I am handling it in the callback. Notice how I am getting the ResponseUri - your final destination.

如果您不想阻止重定向并简单地获取 URL，则不需要处理 AllowAutoRedirect，就像我在上面的代码段中所做的那样.

You don't need to handle AllowAutoRedirect if you don't want blocking the redirect and simply getting the URL, like I am doing in the snippet above.

在 WebClient wp7 中重定向时获取当前 Uri

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