CacheContainer

using System;
using System.Collections.Generic;
using System.Runtime.Caching;
using System.Linq;

namespace Caching
{

    public class CacheContainer
    {
        static readonly ObjectCache Cache = MemoryCache.Default;


        /// <summary>
        /// Retrieve cached item
        /// </summary>
        /// <typeparam name="T">Type of cached item</typeparam>
        /// <param name="key">Name of cached item</param>
        /// <returns>Cached item as type</returns>
        public static T Get<T>(string key) where T : class
        {
            if(GetAllKeys().Any(a => a == key))
                return (T)Cache[key];
            else
                return null;
        }

        /// <summary>
        /// Insert value into the cache using
        /// appropriate name/value pairs
        /// </summary>
        /// <typeparam name="T">Type of cached item</typeparam>
        /// <param name="objectToCache">Item to be cached</param>
        /// <param name="key">Name of item</param>
        public static void Add<T>(T objectToCache, string key) where T : class
        {
            Cache.Add(key, objectToCache, DateTime.Now.AddHours(1));
        }

        /// <summary>
        /// Insert value into the cache using
        /// appropriate name/value pairs
        /// </summary>
        /// <param name="objectToCache">Item to be cached</param>
        /// <param name="key">Name of item</param>
        public static void Add(object objectToCache, string key)
        {
            Cache.Add(key, objectToCache, DateTime.Now.AddHours(1));
        }

        /// <summary>
        /// Remove item from cache
        /// </summary>
        /// <param name="key">Name of cached item</param>
        public static void Clear(string key)
        {
            Cache.Remove(key);
        }

        public static void ClearAll()
        {
            foreach (var k in GetAllKeys())
                Cache.Remove(k);
        }

        /// <summary>
        /// Check for item in cache
        /// </summary>
        /// <param name="key">Name of cached item</param>
        /// <returns></returns>
        public static bool Exists(string key)
        {
            return Cache.Get(key) != null;
        }

        /// <summary>
        /// Gets all cached items as a list by their key.
        /// </summary>
        /// <returns></returns>
        public static IEnumerable<string> GetAllKeys()
        {
            return Cache.Select(keyValuePair => keyValuePair.Key);
        }

        public static TResult Load<TResult>(string key, Func<TResult> loadFunction) where TResult : class
        {
            key = typeof(TResult).FullName + "~" + key;
            var result = default(TResult);
            if (CacheContainer.Exists(key))
            {
                result = CacheContainer.Get<TResult>(key);
            }
            else
            {
                result = loadFunction();
                if(result != null)
                    CacheContainer.Add(result,key);
            }
            return result;
        }

        public static TResult Reload<TResult>(string key, TResult value) where TResult : class
        {
            key = typeof(TResult).FullName + "~" + key;
            if (GetAllKeys().Contains(key))
                Cache[key] = value;
            else
                Add<TResult>(value, key);
            return value;
        }
}