Dynamic where clause in Linq to Entities

Question

I\'m using linq to entities(EF). I have a constructor which takes 4 string parameters. Depending on what parameter is not null I have to build the linq query. I can do with

Answer 1

You can chain the methods as needed:

 YourType(string p1, string p2, string p3, string p4)
 {
      var prod = ctxt.Products.Expand("items\details");

      if (!p1.IsNullOrWhiteSpace())
          prod = prod.Where(p => p.x == p1);
      if (!p2.IsNullOrWhiteSpace())
          prod = prod.Where(p => p.xx == p2);

      // ....

      // use "prod"
 }

The resulting SQL should be the same as if you put them all in a single statement.