System.Web.Caching

System.Web.Caching简单封装类：

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

 namespace APP.HttpCache
 {
     public class CacheHelper
     {
         private static Cache cacheObj = HttpRuntime.Cache;

         /// <summary>
         /// 简单key，vlaue写入
         /// </summary>
         /// <param name="key"></param>
         /// <param name="value"></param>
         public static void Insert(string key, object value)
         {
             cacheObj.Insert(key, value);
         }

         /// <summary>
         /// 设置绝对过期时间
         /// </summary>
         /// <param name="key"></param>
         /// <param name="value"></param>
         /// <param name="absoluteExpiration"></param>
         /// <param name="slidingExpiration"></param>
         public static void Insert(string key, object value, DateTime absoluteExpiration)
         {
             cacheObj.Insert(key, value, null, absoluteExpiration, Cache.NoSlidingExpiration);
         }

         /// <summary>
         /// 设置平滑过期
         /// </summary>
         /// <param name="key"></param>
         /// <param name="value"></param>
         /// <param name="slidingExpiration"></param>
         public static void Insert(string key, object value, TimeSpan slidingExpiration)
         {
             cacheObj.Insert(key, value, null, Cache.NoAbsoluteExpiration, slidingExpiration);
         }

         /// <summary>
         /// 得到vlaue
         /// </summary>
         /// <param name="key"></param>
         /// <returns></returns>
         public static object Get(string key)
         {
             return cacheObj.Get(key);
         }

         /// <summary>
         /// 得到vlaue
         /// </summary>
         /// <param name="key"></param>
         /// <returns></returns>
         public static T Get<T>(string key)
         {
             var v = cacheObj.Get(key);
             return v == null ? default(T) : (T)Convert.ChangeType(v, typeof(T));
         }

         /// <summary>
         /// 移除key
         /// </summary>
         /// <param name="key"></param>
         /// <returns></returns>
         public static void Delete(string key)
         {
             cacheObj.Remove(key);
         }

         /// <summary>
         /// 移除key
         /// </summary>
         /// <param name="key"></param>
         /// <returns></returns>
         public static object Remove(string key)
         {
             return cacheObj.Remove(key);
         }

         /// <summary>
         /// 移除key
         /// </summary>
         /// <param name="key"></param>
         /// <returns></returns>
         public static T Remove<T>(string key)
         {
             var v = cacheObj.Remove(key);
             return v == null ? default(T) : (T)Convert.ChangeType(v, typeof(T));
         }

         /// <summary>
         /// 缓存key数量
         /// </summary>
         public static int KeyCount
         {
             get
             {
                 return cacheObj.Count;
             }
         }

         /// <summary>
         /// 所有key
         /// </summary>
         public static ArrayList KeyAll()
         {
             var arr = new ArrayList();
             var item = cacheObj.GetEnumerator();
             while (item.MoveNext())
             {
                 arr.Add(item.Key);
             }
             return arr;
         }

         /// <summary>
         /// 清空所有缓存
         /// </summary>
         public static void DeleteAll()
         {
             var item = cacheObj.GetEnumerator();
             while (item.MoveNext())
             {
                 cacheObj.Remove(item.Key.ToString());
             }
         }
     }
 }