How to get rank from full-text search query with Linq to SQL?

Posted by Stephen Jennings on Stack Overflow See other posts from Stack Overflow or by Stephen Jennings
Published on 2010-05-09T04:22:56Z Indexed on 2010/05/09 4:28 UTC
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LINQ

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linq-to-sql

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asp.net-mvc

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sql-server

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full-text-search

I am using Linq to SQL to call a stored procedure which runs a full-text search and returns the rank plus a few specific columns from the table Article. The rank column is the rank returned from the SQL function FREETEXTTABLE(). I've added this sproc to the data model designer with return type Article.

This is working to get the columns I need; however, it discards the ranking of each search result. I'd like to get this information so I can display it to the user.

So far, I've tried creating a new class RankedArticle which inherits from Article and adds the column Rank, then changing the return type of my sproc mapping to RankedArticle. When I try this, an InvalidOperationException gets thrown:

Data member 'Int32 ArticleID' of type 'Heap.Models.Article' is not part of the mapping for type 'RankedArticle'. Is the member above the root of an inheritance hierarchy?

I can't seem to find any other questions or Google results from people trying to get the rank column, so I'm probably missing something obvious here.

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