void wc_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
if (e.Cancelled)
{
return;
}
if (e.Error != null)
{
bool redownloadAttempted = WebClientFactory.RedownloadAttempted.Contains(wc);
if (Utility.IsMessageLimitExceededException(e.Error) && !redownloadAttempted)
{
// Re-issue the request which should serve it out of cache
// and helps us avoid the error which is caused by setting AllowReadStreamBuffering=false
// which was used to workaround the problem of SL4 and gzipped content
WebClientFactory.RedownloadStringAsync(wc, new Uri(File.Path, UriKind.RelativeOrAbsolute), e.UserState);
}
else
{
if (redownloadAttempted)
{
WebClientFactory.RedownloadAttempted.Remove(wc);
}
OnGetFileAsTextFailed(new ExceptionEventArgs(e.Error, e.UserState));
}
return;
}
OnGetFileAsTextCompleted(new GetFileAsTextCompletedEventArgs()
{
FileContents = e.Result, UserState = e.UserState
});
}
public override void GetLayout(object userState, EventHandler <LayoutEventArgs> onCompleted, EventHandler <ExceptionEventArgs> onFailed)
{
if (!string.IsNullOrEmpty(LayoutFileContents))
{
try
{
LayoutEventArgs args = ParseXamlFileContents(LayoutFileContents);
if (args != null)
{
if (onCompleted != null)
{
onCompleted(this, args);
}
}
else
{
if (onFailed != null)
{
onFailed(this, new ExceptionEventArgs(Resources.Strings.ExceptionUnableToParseFile, userState));
}
}
}
catch (Exception ex)
{
if (onFailed != null)
{
onFailed(this, new ExceptionEventArgs(ex, userState));
}
}
return;
}
if (string.IsNullOrEmpty(FileUrl))
{
throw new InvalidOperationException(Resources.Strings.ExceptionMustSpecifyFileUrl);
}
Uri uri = null;
if (!Uri.TryCreate(FileUrl, UriKind.RelativeOrAbsolute, out uri))
{
throw new InvalidOperationException(Resources.Strings.ExceptionMustSpecifyValidFileUrl);
}
WebClient webClient = WebClientFactory.CreateWebClient();
webClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(layoutFileDownloadCompleted);
webClient.DownloadStringAsync(uri, new object[] { onCompleted, onFailed, userState });
}
public void GetFileAsTextAsync(object userState)
{
if (File == null)
{
throw new InvalidOperationException(Resources.Strings.ExceptionMustSpecifyFile);
}
if (File.IsUrl)
{
wc = WebClientFactory.CreateWebClient();
wc.DownloadStringCompleted += new DownloadStringCompletedEventHandler(wc_DownloadStringCompleted);
wc.DownloadStringAsync(new Uri(File.Path, UriKind.RelativeOrAbsolute), userState);
}
else
{
OnGetFileAsTextFailed(new ExceptionEventArgs(new Exception(Resources.Strings.ExceptionInvalidFileMustBeUrlForSilverlightApplication), userState));
}
}
public WebClient BackgroundOpenReadAsync(Uri address, object userToken)
{
WebClient webClient = WebClientFactory.CreateWebClient();
// Create a background worker thread to execute the async read without buffering which can only be done on a
// background thread.
BackgroundWorker worker = new BackgroundWorker()
{
WorkerReportsProgress = false,
WorkerSupportsCancellation = false,
};
worker.DoWork += (sender, args) =>
{
webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
webClient.OpenReadAsync(address, userToken);
};
worker.RunWorkerAsync();
return(webClient);
}
