Windows phone 7 是否从System.Net.WebClient的响应中获取请求的URL？

我正在使用System.Net.WebClient从URL检索一些数据

void GetAirportData()
{
  var url = "http://server.example.com/airports.xml?id=OSL";
  var webClient = new WebClient();
  webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
  webClient.OpenReadAsync(new Uri(url, UriKind.Absolute));
}

void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
   //How can I see the original URL here, so that I can see which id parameter was passed?
}

我发送的请求将包含一个URL，其中包含一些参数，这些参数在每次调用时都会更改，我需要知道在响应返回时我请求了哪个参数

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例如，我可以使用sender对象的.UserState属性吗？

如果需要URL，我会将您的代码更改为如下内容：

void GetAirportData()
{
  var url = new Uri("http://server.example.com/airports.xml?id=OSL", UriKind.Absolute);
  var webClient = new WebClient();
  webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
  webClient.OpenReadAsync(url, url);
}

void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
   // Gets the original url passed.
   var url = e.UserState as Uri;
}

---

如果需要URL，我会将您的代码更改为：

void GetAirportData()
{
  var url = new Uri("http://server.example.com/airports.xml?id=OSL", UriKind.Absolute);
  var webClient = new WebClient();
  webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
  webClient.OpenReadAsync(url, url);
}

void webClient_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
   // Gets the original url passed.
   var url = e.UserState as Uri;
}