I have the following code to make an asynchronous call synchronous.
Please don't get into that this is bad, I know, and it needs to be done this way for only one particular request.
The code throws an exception in Windows Phone 8 when the using (var response = request.EndGetResponse(request.BeginGetResponse(null, null))) is executing.
The request is actually invoked in the UnhandledException event handler.
Exception: NotSupportedException
Message: Method is not supported
Stacktrace:
at System.Net.Browser.ClientHttpWebRequest.BeginGetResponse(AsyncCallback callback, Object state) at Gtas.Core.ServiceRepository.ExecuteGtasRequest(String url, String requestData, Boolean isError, String filePath) at Gtas.Core.Helpers.GtasRequestWorker.HandleException(Exception exception, AppEnvironment appEnvironment, GtasPerformance GtasPerformance, LimitedCrashExtraDataList extraData, String filePath) at Gtas_WP8.GtasHandler.UnhandledExceptionsHandler(Object sender, ApplicationUnhandledExceptionEventArgs e) at MS.Internal.Error.CallApplicationUEHandler(Exception e) at MS.Internal.Error.IsNonRecoverableUserException(Exception ex, UInt32& xresultValue)
public void ExecuteRequest(string url, string requestData)
{
try
{
WebRequest request = WebRequest.Create(new Uri(url));
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.Headers["Header-Key"] = "AKey";
// Convert the string into a byte array.
byte[] postBytes = Encoding.UTF8.GetBytes(requestData);
using (var requestStream = request.EndGetRequestStream(request.BeginGetRequestStream(null, null)))
{
// Write to the request stream.
endGetRequestStream.Write(postBytes, 0, postBytes.Length);
}
using (var response = request.EndGetResponse(request.BeginGetResponse(null, null))) // NotSupportedException
{
using (var streamRead = new StreamReader(response.GetResponseStream()))
{
// The Response
string responseString = streamRead.ReadToEnd();
if (!string.IsNullOrWhiteSpace(requestDataObjResult.FileName))
{
var fileRepo = new FileRepository();
fileRepo.Delete(request.FileName);
}
Debug.WriteLine("Response : {0}", responseString);
}
}
}
catch (WebException webEx)
{
WebExceptionStatus status = webEx.Status;
WebResponse responseEx = webEx.Response;
Debug.WriteLine(webEx.ToString());
}
}
Is it possible for the framework not to allow this?
Thank you in advance.
don´t you need to wait until BeginGetResponse is finished before you call EndGetResponse? That could cause the NotSupportedException.
Further I came along a similar problem. There was a NotSupportedException thrown when I tried to call BeginGetResponse with a callback of null. I get around this issue by just defining this
as the callback. (That was silverlight)
Regards
Christoph