Dynamic query in LINQ

Question

How do I write a dynamic query for Linq, if I have say Customer class which holds the fields:

string name
string address
int phoneno

I have to

Answer 1

Check out this http://www.albahari.com/nutshell/predicatebuilder.aspx, it allows for strongly typed predicate building, it can be really nice. If you want actually dynamic string built predicates than you can use the LINQ Dynamic Query Library provided by ScottGu.

Both will accomplish what you want although I would recommend the first option before the second.

Allowing you to do:

var predicate = PredicateBuilder.True();

if(!string.IsNullOrEmpty(name))
    predicate = predicate.And(p => p.name == name);


...

var myResults = Context.MyLinTypeQueryTable.Where(predicate);

And more.