ElementAtOrDefault for Dictionaries

DictionaryElementAtOrDefault.cs

using System;
using System.Collections.Generic;

namespace Foo
{
    public static class DictionaryExtensions
    {
        public static TValue ElementAtOrDefault<TKey, TValue>(this IDictionary<TKey, TValue> dictionary, TKey key)
        {
            if (dictionary == null)
                throw new ArgumentNullException(nameof(dictionary));

            return (dictionary.ContainsKey(key) ? dictionary[key] : default(TValue));
        }
    }
}