Answer by jason for This code returns distinct values. However, what I want is to return a strongly typed collection as opposed to an anonymous type

You need to override Equals and GetHashCode for BarObject because the EqualityComparer.Default<BarObject> is reference equality unless you have provided overrides of Equals and GetHashCode (this is what Enumerable.Distinct<BarObject>(this IEnumerable<BarObject> source) uses). Alternatively, you can pass in an IEqualityComparer<BarObject> to Enumerable.Distinct<BarObject>(this IEnumerable<BarObject>, IEqualityComparer<BarObject>).