C#缓存主要是为了提高数据的读取速度。由于server和应用client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client服务，能够降低client与server端的数据交互。从而大大提高程序的性能。

下面为工作中经经常使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{    /// 
    /// Caching 的摘要说明    /// 
    public class Caching    {        /// 
        /// 获取当前应用程序指定CacheKey的Cache值        /// 
        ///         /// 
     y        public static object GetCache(string CacheKey)        {            System.Web.Caching.Cache objCache = HttpRuntime.Cache;            return objCache[CacheKey];        }        /// 
        /// 设置当前应用程序指定CacheKey的Cache值        /// 
        ///         ///         public static void SetCache(string CacheKey, object objObject)        {            System.Web.Caching.Cache objCache = HttpRuntime.Cache;            objCache.Insert(CacheKey, objObject);        }        /// 
        /// 设置当前应用程序指定CacheKey的Cache值        /// 
        ///         ///         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);        }        /// 
        /// 清除单一键缓存        /// 
        ///         public static void RemoveKeyCache(string CacheKey)        {            try            {                System.Web.Caching.Cache objCache = HttpRuntime.Cache;                objCache.Remove(CacheKey);            }            catch { }        }        /// 
        /// 清除全部缓存        /// 
        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);                }            }        }        /// 
        /// 以列表形式返回已存在的全部缓存         /// 
        /// 
              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;        }    }}