public static IAsyncResult BeginSearch <T>(GoogleSearchRequest request, int resultCount, AsyncCallback callback, object state)
{
var searchAsyncResult = new SearchAsyncResult <T>(state);
RunSearch(searchAsyncResult, request, 0, resultCount, callback);
return(searchAsyncResult);
}
private static void RunSearch <T>(SearchAsyncResult <T> searchAsyncResult, GoogleSearchRequest request, int start, int restCount, AsyncCallback callback)
{
if (restCount > 0)
{
var resultSize = restCount > 4 ? ResultSize.Large : ResultSize.Small;
BeginGetResponseData(
request,
start,
resultSize,
ar =>
{
try
{
ISearchData <T> searchData;
try
{
searchData = EndGetResponseData <T>(ar);
}
catch (GoogleServiceException ex)
{
if (ex.ResponseStatus == ResponseStatusConstant.OutOfRangeStatus)
{
FinishSearch(searchAsyncResult, callback);
return;
}
throw;
}
var count = Math.Min(searchData.Results.Length, restCount);
if (count == 0)
{
FinishSearch(searchAsyncResult, callback);
}
else
{
searchAsyncResult.Result.AddRange(searchData.Results.Take(count));
RunSearch(searchAsyncResult, request, start + count, restCount - count, callback);
}
}
catch (Exception ex)
{
searchAsyncResult.Exception = ex;
FinishSearch(searchAsyncResult, callback);
}
},
null);
}
else
{
FinishSearch(searchAsyncResult, callback);
}
}
private static void FinishSearch <T>(SearchAsyncResult <T> searchAsyncResult, AsyncCallback callback)
{
try
{
callback(searchAsyncResult);
}
finally
{
searchAsyncResult.Complete();
}
}
