using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace CitiVelocity.Web.Models
{
public class Extension
{
}
public class CommonEqualityComparer<T, V> : IEqualityComparer<T>
{
private Func<T, V> keySelector;
public CommonEqualityComparer(Func<T, V> keySelector)
{
this.keySelector = keySelector;
}
public bool Equals(T x, T y)
{
return EqualityComparer<V>.Default.Equals(keySelector(x), keySelector(y));
}
public int GetHashCode(T obj)
{
return EqualityComparer<V>.Default.GetHashCode(keySelector(obj));
}
}
public static class DistinctExtensions
{
public static IEnumerable<T> Distinct<T, V>(this IEnumerable<T> source, Func<T, V> keySelector)
{
return source.Distinct(new CommonEqualityComparer<T, V>(keySelector));
}
}
}