Using my own method with LINQ to Entities

Question

I have a project with LINQ and I want to use my own method in it. This NoWhiteSpaces method should return upper string with no spaces.

public static class Li         


        

Answer 1

LINQ to Entities tries to translate every called method into a part of the database query that is executed. When trying to translate your method, it fails because it doesn't know how to represent it in SQL.

You can get around it by either

• Executing the query and filter it after materializing the results (bad idea though if you are handling large datasets), or
• Use only supported methods (better approach IMO). You can find a list of supported methods here:
  CLR Method to Canonical Function Mapping
  As the methods String.Replace() and String.ToUpper() are supported, it should be easy to replace your custom method with it.