/// <summary>
/// Begins executing this async request.
/// </summary>
/// <param name="callback">The AsyncCallback delegate.</param>
/// <param name="state">An object that contains state information for this request.</param>
/// <returns>An IAsyncResult that references the asynchronous request.</returns>
internal IAsyncResult BeginExecute(AsyncCallback callback, object state)
{
this.Validate();
IEwsHttpWebRequest request = this.BuildEwsHttpWebRequest();
WebAsyncCallStateAnchor wrappedState = new WebAsyncCallStateAnchor(this, request, callback /* user callback */, state /* user state */);
// BeginGetResponse() does not throw interesting exceptions
IAsyncResult webAsyncResult = request.BeginGetResponse(SimpleServiceRequestBase.WebRequestAsyncCallback, wrappedState);
return(new AsyncRequestResult(this, request, webAsyncResult, state /* user state */));
}
/// <summary>
/// Async callback method for HttpWebRequest async requests.
/// </summary>
/// <param name="webAsyncResult">An IAsyncResult that references the asynchronous request.</param>
private static void WebRequestAsyncCallback(IAsyncResult webAsyncResult)
{
WebAsyncCallStateAnchor wrappedState = webAsyncResult.AsyncState as WebAsyncCallStateAnchor;
if (wrappedState != null && wrappedState.AsyncCallback != null)
{
AsyncRequestResult asyncRequestResult = new AsyncRequestResult(
wrappedState.ServiceRequest,
wrappedState.WebRequest,
webAsyncResult, /* web async result */
wrappedState.AsyncState /* user state */);
// Call user's call back
wrappedState.AsyncCallback(asyncRequestResult);
}
}
