MaxBy extension

gistfile1.cs

		public static TItem MaxBy<TItem, TValue>(this IEnumerable<TItem> items, Func<TItem, TValue> selector)
			where TValue : IComparable
		{
			if (items == null)
				throw new ArgumentNullException("items");

			if (selector == null)
				throw new ArgumentNullException("selector");

			TItem maxItem = items.FirstOrDefault();
			TValue maxValue = selector(maxItem);
			foreach (var item in items)
			{
				var value = selector(item);
				if (value.CompareTo(maxValue) > 0)
				{
					maxValue = value;
					maxItem = item;
				}
			}

			return maxItem;
		}