How to check an internet connection in a Portable class library

Question

So I would like to check an internet connection in a Portable Class Library.

So far I have used this method GetResponse() in C#

But this doesn't return a boolean value to tell me if I have a connection or not.

So far my code looks like this:

    public static bool CheckForInternetConnection()
    {
        try
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.google.com");
            request.UseDefaultCredentials = true;
            request.BeginGetResponse(new AsyncCallback(FinishRequest), request);
        }
        catch
        {
            return false;
        }
    }

    private static bool FinishRequest(IAsyncResult result)
    {
        HttpWebResponse response = (result.AsyncState as HttpWebRequest).EndGetResponse(result) as HttpWebResponse;
        if (response.StatusCode == HttpStatusCode.OK)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

but I get an error on the line with new AsyncCallback() saying FinishRequest has the wrong return type.. How can I do this?

Please bear in mind that this is in a Portable class library so the method GetResponse() does not exist

Answer 1

You could use the manualresetevent like this:

private static ManualResetEvent evt = new ManualResetEvent(false);

public static bool CheckForInternetConnection()
{
  try
  {
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://www.google.com");
    request.UseDefaultCredentials = true;
    request.BeginGetResponse(new AsyncCallback(FinishRequest), request);
    evt.WaitOne();
    return request.HaveResponse;
  }
  catch
  {
    return false;
  }
}

private static void FinishRequest(IAsyncResult result)
{
  HttpWebResponse response = (result.AsyncState as HttpWebRequest).EndGetResponse(result) as HttpWebResponse;
  evt.Set();
}