C#缓存主要是为了提高数据的读取速度。因为服务器和应用客户端之间存在着流量的瓶颈，所以读取大容量数据时，使用缓存来直接为客户端服务，可以减少客户端与服务器端的数据交互，从而大大提高程序的性能。

以下为工作中经常用到的缓存操作公用类库整理：

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Caching;
using System.Web.Hosting;
namespace ECS.Utility
{
    /// <summary>
    /// Caching 的摘要说明
    /// </summary>
    public class Caching
    {

        /// <summary>
        /// 获取当前应用程序指定CacheKey的Cache值
        /// </summary>
        /// <param name="CacheKey"></param>
        /// <returns></returns>y
        public static object GetCache(string CacheKey)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            return objCache[CacheKey];
        }

        /// <summary>
        /// 设置当前应用程序指定CacheKey的Cache值
        /// </summary>
        /// <param name="CacheKey"></param>
        /// <param name="objObject"></param>
        public static void SetCache(string CacheKey, object objObject)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(CacheKey, objObject);
        }


        /// <summary>
        /// 设置当前应用程序指定CacheKey的Cache值
        /// </summary>
        /// <param name="CacheKey"></param>
        /// <param name="objObject"></param>
        public static void SetCache(string CacheKey, object objObject, DateTime absoluteExpiration, TimeSpan slidingExpiration)
        {
            System.Web.Caching.Cache objCache = HttpRuntime.Cache;
            objCache.Insert(CacheKey, objObject, null, absoluteExpiration, slidingExpiration);
        }

        /// <summary>
        /// 清除单一键缓存
        /// </summary>
        /// <param name="key"></param>
        public static void RemoveKeyCache(string CacheKey)
        {
            try
            {
                System.Web.Caching.Cache objCache = HttpRuntime.Cache;
                objCache.Remove(CacheKey);
            }
            catch { }
        }

        /// <summary>
        /// 清除所有缓存
        /// </summary>
        public static void RemoveAllCache()
        {
            System.Web.Caching.Cache _cache = HttpRuntime.Cache;
            IDictionaryEnumerator CacheEnum = _cache.GetEnumerator();
            if (_cache.Count > 0)
            {
                ArrayList al = new ArrayList();
                while (CacheEnum.MoveNext())
                {
                    al.Add(CacheEnum.Key);
                }
                foreach (string key in al)
                {
                    _cache.Remove(key);
                }
            }
        }

        /// <summary>
        /// 以列表形式返回已存在的所有缓存 
        /// </summary>
        /// <returns></returns> 
        public static ArrayList ShowAllCache()
        {
            ArrayList al = new ArrayList();
            System.Web.Caching.Cache _cache = HttpRuntime.Cache;
            if (_cache.Count > 0)
            {
                IDictionaryEnumerator CacheEnum = _cache.GetEnumerator();
                while (CacheEnum.MoveNext())
                {
                    al.Add(CacheEnum.Key);
                }
            }
            return al;
        }


    }
}

C#数据缓存介绍及Caching通用帮助类整理