Using Distinct with LINQ and Objects

Question

Until recently, I was using a Distinct in LINQ to select a distinct category (an enum) from a table. This was working fine.

I now need to have it distinct on a class

Answer 1

try an IQualityComparer

public class MyObjEqualityComparer : IEqualityComparer
{
    public bool Equals(MyObj x, MyObj y)
    {
        return x.Category.Equals(y.Category) &&
               x.Country.Equals(y.Country);
    }

    public int GetHashCode(MyObj obj)
    {
        return obj.GetHashCode();
    }
}

then use here

var comparer = new MyObjEqualityComparer();
myObjs.Where(m => m.SomeProperty == "whatever").Distinct(comparer);