How to get a distinct list from a List of objects?

Question

I have a List someList.

class MyClass
{
    public int Prop1...
    public int Prop2...
    public int Prop3...
}

Answer 1

Create a class that implements the IEqualityComparer Interface that only checks for your Prop2-Property. You can then pass an instance of this class to the Distinct extension method.