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I am trying to build a web application in ASP.NET MVC and need build a pretty complex search feature. When a user enters a search term I want to search a variety of data sources which include documents, tables in the database, webpage urls and some APIs like facebook. Any tips, tutorials and hints would be greatly appreciated.
Your question suggests that you’re probably not planing to implement the whole feature from scratch, so here are some links that you may find useful.
One (the easiest) option would be to use a third-party search engine (e.g. Google Custom Search, but Bing probably has a similar API). This allows you to search (only) your page using Google and display the results in a customized way. The limiation is that it searches only data displayed on some (linked) pages.
A more sophisticated approach is to use some .NET library that implements indexing for you (based on the data you give it). A popular library is for example Lucene.Net. In this case, you give it the data you want to search explicitly (relevant content from web pages, database content, etc.), so you have more control of what is being searched (but it is a bit more work).