Filter Linq EXCEPT on properties

Question

This may seem silly, but all the examples I\'ve found for using Except in linq use two lists or arrays of only strings or integers and filters them based on the

Answer 1

This is what LINQ needs

public static IEnumerable Except(this IEnumerable items, IEnumerable other, Func getKey) 
{
    return from item in items
            join otherItem in other on getKey(item)
            equals getKey(otherItem) into tempItems
            from temp in tempItems.DefaultIfEmpty()
            where ReferenceEquals(null, temp) || temp.Equals(default(T))
            select item; 
}