/// <summary>
/// worker method for the query case
/// </summary>
/// <param name="data"></param>
/// <param name="asyncOp"></param>
/// <param name="completionMethodDelegate"></param>
/// <returns></returns>
private void AsyncQueryWorker(AsyncQueryData data, AsyncOperation asyncOp, SendOrPostCallback completionMethodDelegate)
{
try
{
long contentLength;
using (var responseStream = Query(data.UriToUse, data.Modified, null, out contentLength))
{
HandleResponseStream(data, responseStream, contentLength);
}
}
catch (Exception e)
{
data.Exception = e;
}
completionMethodDelegate(data);
}
/// <summary>
/// the basic interface as an async version. This call will return directly
/// and you need to rely on the events fired to figure out what happened.
/// </summary>
/// <param name="queryUri">the Uri to Query</param>
/// <param name="ifModifiedSince">The ifmodifiedsince date, use DateTime.MinValue if you want everything</param>
/// <param name="doParse">if true, returns a feed, else a stream</param>
/// <param name="userData">The userData token. this must be unique if you make several async requests at once</param>
/// <returns>nothing</returns>
private void QueryAsync(Uri queryUri, DateTime ifModifiedSince, bool doParse, Object userData)
{
AsyncOperation asyncOp = AsyncOperationManager.CreateOperation(userData);
AsyncQueryData data = new AsyncQueryData(queryUri, ifModifiedSince, doParse, asyncOp, userData, this.ProgressReportDelegate);
AddUserDataToDictionary(userData, asyncOp);
// Start the asynchronous operation.
WorkerQueryEventHandler workerDelegate = new WorkerQueryEventHandler(AsyncQueryWorker);
workerDelegate.BeginInvoke(
data,
asyncOp,
this.CompletionMethodDelegate,
null,
null);
}