/// <summary>
/// The asynchronous web response callback.
/// </summary>
/// <param name="asyncResult">The asynchronous result.</param>
/// <param name="callback">The callback method.</param>
/// <param name="state">The asynchronous state.</param>
private static void ResponseCallback(IAsyncResult asyncResult, Action <string, Exception> callback, object state)
{
string result = null;
Exception exception = null;
try
{
var request = (HttpWebRequest)asyncResult.AsyncState;
var response = (HttpWebResponse)request.EndGetResponse(asyncResult);
using (Stream responseStream = response.GetResponseStream())
{
using (StreamReader reader = new StreamReader(responseStream))
{
result = reader.ReadToEnd();
}
}
}
catch (WebException ex)
{
exception = new WebExceptionWrapper(ex);
}
catch (Exception ex)
{
exception = ex;
}
finally
{
if (callback != null)
{
callback(result, exception);
}
}
}
/// <summary>
/// Gets the response string from web exception.
/// </summary>
/// <param name="webException">
/// The web exception.
/// </param>
/// <returns>
/// Response string.
/// </returns>
internal static string GetResponseString(WebExceptionWrapper webException)
{
if (webException.HasResponse)
{
using (var stream = webException.GetResponseStream())
{
if (stream != null)
{
using (var reader = new StreamReader(stream))
{
return(reader.ReadToEnd());
}
}
}
}
return(null);
}
internal static FacebookApiException GetGraphException(WebExceptionWrapper exception)
{
Contract.Requires(exception != null);
FacebookApiException resultException = null;
try
{
if (exception.HasResponse)
{
object response = null;
string json = null;
using (var stream = exception.GetResponseStream())
{
if (stream != null)
{
using (var reader = new StreamReader(stream))
{
json = reader.ReadToEnd();
}
}
}
if (json != null)
{
response = JsonSerializer.Current.DeserializeObject(json);
}
resultException = GetGraphException(response);
}
}
catch
{
resultException = null;
// We dont want to throw anything associated with
// trying to build the FacebookApiException
}
return(resultException);
}
internal static FacebookApiException GetGraphException(WebExceptionWrapper exception)
{
Contract.Requires(exception != null);
FacebookApiException resultException = null;
try
{
if (exception.HasResponse)
{
object response = null;
string json = null;
using (var stream = exception.GetResponseStream())
{
if (stream != null)
{
using (var reader = new StreamReader(stream))
{
json = reader.ReadToEnd();
}
}
}
if (json != null)
{
response = JsonSerializer.Current.DeserializeObject(json);
}
resultException = GetGraphException(response);
}
}
catch
{
resultException = null;
// We dont want to throw anything associated with
// trying to build the FacebookApiException
}
return resultException;
}
public WebClientWrapper(WebClient webClient)
{
_webClient = webClient;
#if SILVERLIGHT
_webClient.UploadStringCompleted +=
#else
_webClient.UploadDataCompleted +=
#endif
(o, e) =>
{
if (UploadDataCompleted == null)
{
return;
}
if (e == null)
{
UploadDataCompleted(o, null);
}
else
{
byte[] result = null;
var error = e.Error;
if (error == null)
{
#if SILVERLIGHT
if (!string.IsNullOrEmpty(e.Result))
{
result = System.Text.Encoding.UTF8.GetBytes(e.Result);
}
#else
result = e.Result;
#endif
}
else if (error is WebException)
{
error = new WebExceptionWrapper((WebException)error);
}
UploadDataCompleted(o, new UploadDataCompletedEventArgsWrapper(error, e.Cancelled, e.UserState, result));
}
};
#if SILVERLIGHT
_webClient.DownloadStringCompleted +=
#else
_webClient.DownloadDataCompleted +=
#endif
(o, e) =>
{
if (DownloadDataCompleted == null)
{
return;
}
if (e == null)
{
DownloadDataCompleted(o, null);
}
else
{
byte[] result = null;
var error = e.Error;
if (error == null)
{
#if SILVERLIGHT
if (!string.IsNullOrEmpty(e.Result))
{
result = System.Text.Encoding.UTF8.GetBytes(e.Result);
}
#else
result = e.Result;
#endif
}
else if (error is WebException)
{
error = new WebExceptionWrapper((WebException)error);
}
DownloadDataCompleted(o, new DownloadDataCompletedEventArgsWrapper(error, e.Cancelled, e.UserState, result));
}
};
}
public WebClientWrapper(WebClient webClient)
{
_webClient = webClient;
#if SILVERLIGHT
_webClient.UploadStringCompleted +=
#else
_webClient.UploadDataCompleted +=
#endif
(o, e) =>
{
if (UploadDataCompleted == null)
{
return;
}
if (e == null)
{
UploadDataCompleted(o, null);
}
else
{
byte[] result = null;
var error = e.Error;
if (error == null)
{
#if SILVERLIGHT
if(!string.IsNullOrEmpty(e.Result))
{
result = System.Text.Encoding.UTF8.GetBytes(e.Result);
}
#else
result = e.Result;
#endif
}
else if (error is WebException)
{
error = new WebExceptionWrapper((WebException)error);
}
UploadDataCompleted(o, new UploadDataCompletedEventArgsWrapper(error, e.Cancelled, e.UserState, result));
}
};
#if SILVERLIGHT
_webClient.DownloadStringCompleted +=
#else
_webClient.DownloadDataCompleted +=
#endif
(o, e) =>
{
if (DownloadDataCompleted == null)
{
return;
}
if (e == null)
{
DownloadDataCompleted(o, null);
}
else
{
byte[] result = null;
var error = e.Error;
if (error == null)
{
#if SILVERLIGHT
if(!string.IsNullOrEmpty(e.Result))
{
result = System.Text.Encoding.UTF8.GetBytes(e.Result);
}
#else
result = e.Result;
#endif
}
else if (error is WebException)
{
error = new WebExceptionWrapper((WebException)error);
}
DownloadDataCompleted(o, new DownloadDataCompletedEventArgsWrapper(error, e.Cancelled, e.UserState, result));
}
};
}
