private Task <ContentProviderResult> ExtractContent(ContentProviderHttpRequest request)
{
var validProviders = _contentProviders.Where(c => c.IsValidContent(request.RequestUri))
.ToList();
if (validProviders.Count == 0)
{
return(TaskAsyncHelper.FromResult <ContentProviderResult>(null));
}
var tasks = validProviders.Select(c => c.GetContent(request)).ToArray();
var tcs = new TaskCompletionSource <ContentProviderResult>();
Task.Factory.ContinueWhenAll(tasks, completedTasks =>
{
var faulted = completedTasks.FirstOrDefault(t => t.IsFaulted);
if (faulted != null)
{
tcs.SetException(faulted.Exception);
}
else if (completedTasks.Any(t => t.IsCanceled))
{
tcs.SetCanceled();
}
else
{
ContentProviderResult result = completedTasks.Select(t => t.Result)
.FirstOrDefault(content => content != null);
tcs.SetResult(result);
}
});
return(tcs.Task);
}
protected ContentProviderResult ProcessResult(ContentProviderResult result)
{
if (IsCollapsible && result != null)
{
string contentTitle = String.Format(LanguageResources.Content_HeaderAndToggle, Encoder.HtmlEncode(result.Title));
result.Content = String.Format(ContentFormat, contentTitle, string.Join(" ", BoxClasses), result.Content);
}
return result;
}
