Question

I’d like to search in a Collection (which inherit an another Collection) for a property value.

private ObservableCollection<User> userCollection = someData;

public class User
{
    public string Username { get; set; }
    public ObservableCollection<Department> Memberships { get; set; }
}

public class Department
{
    public string Name { get; set; }
}

//I can't use "Contains", because it requires an object of type "Department", but I don't have the object, just the string "Name" (in this case "MyDepartment")
var result = from usr in userCollection where (usr.Memberships.Contains("MyDepartment")) select usr;

Do you have any suggestions?

Answer 1

use IEnumerable.Any to achieve what you want.

For example :

(from usr in userCollection select usr).
               Any(x=>x.Username.Contains("MyDepartment"))