public IEnumerable <SearchResult> EndQuery(IAsyncResult result)
{
if (!result.IsCompleted)
{
result.AsyncWaitHandle.WaitOne();
}
BingResult bingResult = result as BingResult;
if (bingResult == null)
{
throw new ArgumentException(InvalidAsyncResult, "result");
}
WebRequest req = bingResult.InnerResult.AsyncState as WebRequest;
if (req == null)
{
throw new ArgumentException(InvalidAsyncResult, "result");
}
XElement root;
XmlNamespaceManager nsmgr;
using (WebResponse resp = req.EndGetResponse(bingResult.InnerResult))
using (Stream stream = resp.GetResponseStream())
{
XmlReader reader = XmlReader.Create(stream);
root = XElement.Load(reader);
nsmgr = new XmlNamespaceManager(reader.NameTable);
}
// Extend the namespace manager with some prefixes needed for processing results.
nsmgr.AddNamespace(SearchApiPrefix, SearchApiNS);
nsmgr.AddNamespace(SearchWebPrefix, SearchWebNS);
var errors = root.XPathSelectElements(SearchErrorXPath, nsmgr);
if (errors.Count() > 0)
{
// TODO: Probably want to report these somewhere.
throw new ApplicationException("Search service errors were returned.");
}
var webResults = root.XPathSelectElements(SearchWebResultXPath, nsmgr);
foreach (var webResult in webResults)
{
var title = webResult.XPathSelectElement(SearchWebResultTitle, nsmgr);
var url = webResult.XPathSelectElement(SearchWebResultUrl, nsmgr);
var description = webResult.XPathSelectElement(SearchWebResultDescription, nsmgr);
yield return(new WebResult()
{
Title = title == null ? null : title.Value,
Url = url == null ? null : url.Value,
Description = description == null ? null : description.Value
});
}
}
public IAsyncResult BeginQuery(string query, SourceType sources, AsyncCallback callback, object state)
{
string uri = ConstructQueryUri(query, sources);
WebRequest req = WebRequest.Create(uri);
BingResult bingResult = new BingResult(state);
bingResult.InnerResult = req.BeginGetResponse(
(result) =>
{
if (callback != null)
{
callback(bingResult);
}
},
req);
return(bingResult);
}
public IAsyncResult BeginQuery(string query, SourceType sources, AsyncCallback callback, object state)
{
string uri = ConstructQueryUri(query, sources);
WebRequest req = WebRequest.Create(uri);
BingResult bingResult = new BingResult(state);
bingResult.InnerResult = req.BeginGetResponse(
(result) =>
{
if (callback != null)
callback(bingResult);
},
req);
return bingResult;
}