Helper for inserting and getting entries from the HttpContext Cache

HttpContextCacheHelper

using System;
using System.Collections.Generic;

namespace PinnacleSports.DynamicLines.Helpers
{
	public class HttpContextCacheHelper
	{
		private readonly ICache _cache;

		public HttpContextCacheHelper()
		{
			_cache = new HttpContextCache();
		}
		public HttpContextCacheHelper(ICache cache)
		{
			_cache = cache;
		}

		public void Insert(string key, object value, DateTime absoluteExpiration, TimeSpan slidingExpiration)
		{
			_cache.Insert(key, value, absoluteExpiration, slidingExpiration);
		}

		public List<TOut> GetByKey<TOut>(IEnumerable<string> keys, out List<string> keysNotInCache)
		where TOut : class
		{
			var cachedEntries = new List<TOut>();
			keysNotInCache = new List<string>();

			foreach (var key in keys)
			{
				var cachedEntry = GetByKey<TOut>(key);

				if (cachedEntry == null)
				{
					keysNotInCache.Add(key);
				}
				else
				{
					cachedEntries.Add(cachedEntry);
				}
			}

			return cachedEntries;
		}

		public TOut GetByKey<TOut>(string key)
		where TOut : class
		{
			var obj = _cache.Get(key);

			return obj != null ? (TOut)obj : null;
		}
	}
}