Dynamic LINQ - Is There A .NET 4 Version?

c# linq dynamic-linq linq-expressions
David Hoerster picture David Hoerster · Mar 2, 2011 · Viewed 21.7k times · Source

I'm looking to use LINQ for some searching routines and wanted to have some dynamic where clauses. So, for example, if a user wants to search by city or search by state, I would have a dynamic LINQ Where<> call instead of creating two strongly typed LINQ expressions and then using the appropriate one based on how the user wants to search.

So I would like to do this:

String criteria="p.City='Pittsburgh'";  //or "p.State='PA'"
personData.Where(criteria)

instead of

personData.Where(p => p.City=="Pittsburgh");

or

personData.Where(p => p.State=="PA");

I came across a blog post by Scott Guthrie talking about Dynamic LINQ in the Visual Studio 2008 samples. This seems to do what I want, but my questions are:

  1. Is this sample library supported by Microsoft?
  2. Scott Guthrie's article is in regards to VS2008 (.NET 3.5). Is there a better option for .NET 4? Maybe something that was released with .NET 4 that accomplishes the same thing (or something very close)?

Thanks in advance!

Answer

Pero P. picture Pero P. · Mar 2, 2011

You may want to take a look at PredicateBuilder

Related questions

LINQ : Dynamic select

Consider we have this class : public class Data { public string Field1 { get; set; } public string Field2 { get; set; } public string Field3 { get; set; } public string Field4 { get; set; } public string Field5 { get; set; } } How do I dynamically select for specify …

Read More
using variables in a dynamic linq query

I am using Linq to Entities and have added the using stmt of using System.Linq.Dynamic; My goal is to pass in the whereClause variable into the emailList query (see screen shot). Any thoughts? ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ After using @Michael suggestion I …

Read More
Dynamic LINQ GroupBy Multiple Columns

I need to translate the following LINQ query to Dynamic LINQ that accepts several grouping columns based on user input. Basically I have a bunch of dropdownlists that apply groupings and I don't want to enumerate every combination of groupings. …

Read More