LINQ to Entities - where..in clause with multiple columns

Question

I\'m trying to query data of the form with LINQ-to-EF:

class Location {
    string Country;
    string City;
    string Address;
    …
}

by

Answer 1

I'd replace Contains (which is a method specific to lists and arrays) with the wider IEnumerable's Any extension method:

var result = Location
    .Where(l => keys.Any(k => l.Country == k.Country && l.City = k.City && l.Address == k.Address);

This can also be written:

var result = from l in Location
             join k in keys
             on l.Country == k.Country && l.City == k.City && l.Address == k.Address
             select l;