Comparing the Traditional Begin/End approach to Rx.Net
We have asserted that the Rx example shown in Listing 4-7 is easier to maintain than a more traditional (non-Rx) approach. Let's dive a bit deeper into the differences between classic Begin/End asynchronous programming and Rx.
Were it not for Rx, the searchBingImageApi method would take a second parameter: a delegate for a callback method.
private void searchBingImageApi(string query, Action<string[]> callback)
The body of the method would set up the search...
SearchRequest searchRequest = new SearchRequest();
searchRequest.AppId = App.BingSearchKey;
searchRequest.Query = query;
searchRequest.Sources = new SourceType[1];
searchRequest.Sources[0] = SourceType.Image;
...and then would call ...
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