Question

For instance, in this example Employee and Address has a many-to-many relationship, and an Employee class has a property

public virtual IList<Address> Addresses { get; set; }

In this example, how would I create a linq query to get all Employee that has X as one of its address (X is a Address variable)?

I can think of:

q => q.Where(employee => employee.Addresses.IndexOf(X)>=0);

But I think this will not be optimised and will be very costly.

Answer 1

Try this:

q => q.Where(e => e.Addresses.Any(<your condition goes here>))

for example

q => q.Where(e => e.Addresses.Any(a => a.City == "Moscow"))