c.CacheHelper

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

namespace Common
{
    public static class CacheHelper
    {
        public static void AddOrUpdate(string key, object value, int expiresinhours)
        {
            if (HttpContext.Current != null)
            {
                if (HttpContext.Current.Cache[key] != null)
                {
                    HttpContext.Current.Cache[key] = value;
                }
                else
                {
                    HttpContext.Current.Cache.Add(key, value, null, DateTime.Now.AddHours(expiresinhours), System.Web.Caching.Cache.NoSlidingExpiration, System.Web.Caching.CacheItemPriority.Normal, null);
                }
            }
            else if (MemoryCache.Default != null)
            {
                if (MemoryCache.Default[key] != null)
                {
                    MemoryCache.Default[key] = value;
                }
                else
                {
                    CacheItemPolicy policy = new CacheItemPolicy();
                    policy.AbsoluteExpiration = DateTime.Now.AddHours(expiresinhours);
                    MemoryCache.Default.Set(key, value, policy);
                }
            }
        }

        public static object Get(string key)
        {
            ObjectCache cache = MemoryCache.Default;
    
            if (HttpContext.Current!= null && HttpContext.Current.Cache[key] != null)
            {
                return HttpContext.Current.Cache[key];
            }
            else if (MemoryCache.Default != null && MemoryCache.Default[key] != null)
            {
                return MemoryCache.Default[key];
            }

            return null;
        }

        public static void DeleteCacheThatContains(string value)
        {
            if (HttpContext.Current != null)
            {
                List<string> keys = new List<string>();

                // retrieve application Cache enumerator
                IDictionaryEnumerator enumerator = HttpContext.Current.Cache.GetEnumerator();

                // copy all keys that currently exist in Cache
                while (enumerator.MoveNext())
                {
                    if (enumerator.Key.ToString().Contains(value))
                        keys.Add(enumerator.Key.ToString());
                }

                // delete every key from cache
                for (int i = 0; i < keys.Count; i++)
                {
                    HttpContext.Current.Cache.Remove(keys[i]);
                }
            }
        }


        public static void ClearAllCache()
        {
            if (HttpContext.Current != null)
            {
                List<string> keys = new List<string>();

                // retrieve application Cache enumerator
                IDictionaryEnumerator enumerator = HttpContext.Current.Cache.GetEnumerator();

                // copy all keys that currently exist in Cache
                while (enumerator.MoveNext())
                {
                    keys.Add(enumerator.Key.ToString());
                }

                // delete every key from cache
                for (int i = 0; i < keys.Count; i++)
                {
                    HttpContext.Current.Cache.Remove(keys[i]);
                }
            }
        }
    }
}