Distinct() with lambda?

Question

Right, so I have an enumerable and wish to get distinct values from it.

Using System.Linq, there\'s of course an extension method called Distinct<

Answer 1

Here's a simple extension method that does what I need...

public static class EnumerableExtensions
{
    public static IEnumerable Distinct(this IEnumerable source, Func selector)
    {
        return source.GroupBy(selector).Select(x => x.Key);
    }
}

It's a shame they didn't bake a distinct method like this into the framework, but hey ho.