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Asked: 2026-06-08T14:50:11+00:00

I want to write a simple expression language & LINQ to Entities translator for

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I want to write a simple expression language & LINQ to Entities translator for a small DB application. The translator should simply translate expressions to linq queries, e.g.

[Project Participants] > 50 AND [Project Duration in Months] < 4

should translate to a similar LINQ query as

from p in projects where p.Participants.Count > 50 && p.Duration < 4 select p;

dynamically at runtime.

My aim is to store user specific constraints in a database and use these constraints to generate a list of projects on demand using the entity framework. What is a good practice to do such a ‘translation’?

Thanks a lot,
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1 Answer

  1. Editorial Team

    My recommendation would be to use ScottGu’s dynamic LINQ libs, found here:

    http://weblogs.asp.net/scottgu/archive/2008/01/07/dynamic-linq-part-1-using-the-linq-dynamic-query-library.aspx

    Basically you can parse your simple expression language as a string and using some YACC-style code build the appropriate LINQ query parts at runtime.

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