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 could always build the query in pieces and take advantage of delayed query execution:

public Constructor(int? p1, int? p2, int? p3, int? p4)
{
    var prod = ctxt.products.expand("items\details");

    if(p1 != null)
        prod = prod.Where(p.x == p1);

    if(p2 != null)
        prod = prod.Where(p.xx == p2);

    if(p3 != null)
        prod = prod.Where(p.xxx == p3);

    if(p4 != null)
        prod = prod.Where(p.xxxx == p4);
}