cache 助手

using System;
using System.Web;
using System.Web.Caching;

namespace net91com.Common
{
 /// <summary>
 /// CacheHelper 的摘要说明。
 /// </summary>
 public class CacheHelper
 {
  private CacheHelper()
  {
  }

  /// <summary>
  /// AddCache 添加Cache,缓存存在则添加失败
  /// </summary>
  /// <param name="keyValue">键</param>
  /// <param name="objValue">值</param>
  /// <param name="tsNum">tsNum 秒</param>
        public static void Add(string keyValue, object objValue, double seconds)
  {
            System.Web.HttpRuntime.Cache.Add(keyValue, objValue, null, DateTime.Now.AddSeconds(seconds), TimeSpan.Zero, CacheItemPriority.Default, null);
  }

        /// <summary>
        /// InsertCache 添加Cache,缓存如果存在则会替换
        /// </summary>
        /// <param name="keyValue">键</param>
        /// <param name="objValue">值</param>
        /// <param name="tsNum">tsNum 秒</param>
        public static void Insert(string keyValue, object objValue, double seconds)
        {
            System.Web.HttpRuntime.Cache.Insert(keyValue, objValue, null, DateTime.Now.AddSeconds(seconds), TimeSpan.Zero, CacheItemPriority.Default, null);
        }

        /// <summary>
        /// 删除缓存
        /// </summary>
        /// <param name="keyValue">缓存键</param>
  public static void Remove(string keyValue)
  {
   System.Web.HttpRuntime.Cache.Remove(keyValue);
  }

        /// <summary>
        /// 判断是否存在缓存
        /// </summary>
        /// <param name="keyValue">缓存键</param>
        /// <returns></returns>
        public static bool Exist(string keyValue)
  {
            return System.Web.HttpRuntime.Cache[keyValue] != null;
  }

        /// <summary>
        /// 获取缓存
        /// </summary>
        /// <param name="keyValue">keyValue</param>
        /// <returns></returns>
        public static object Get(string keyValue)
  {
            return System.Web.HttpRuntime.Cache[keyValue];
  }
  
        #region 获取缓存内容
        /// <summary>
        /// 获取缓存内容
        /// </summary>
        /// <param name="cacheKey">缓存标识</param>
        /// <returns></returns>
        public static T Get<T>(string cacheKey)
        {

            return (T)HttpRuntime.Cache[cacheKey];
        }
        #endregion

        #region 添加缓存
        /// <summary>
        /// 添加缓存
        /// </summary>
        /// <param name="cacheKey">缓存标识</param>
        /// <param name="cacheObj">缓存对象</param>
        /// <param name="milliseconds">缓存的时间（以秒位单位）</param>
        /// <returns></returns>
        public static bool Add<T>(string cacheKey, T cacheObj, double seconds)
        {
            try
            {
                HttpRuntime.Cache.Add(
                    cacheKey,
                    cacheObj,
                    null,
                    DateTime.Now.AddSeconds(seconds),
                    TimeSpan.Zero,
                    CacheItemPriority.Normal,
                    null
                    );

                return true;
            }
            catch//(Exception ex)
            {
                return false;
            }
        }

        public static bool Add<T>(string cacheKey, T cacheObj, DateTime expireTime)
        {
            try
            {
                HttpRuntime.Cache.Add(
                    cacheKey,
                    cacheObj,
                    null,
                    expireTime,
                    TimeSpan.Zero,
                    CacheItemPriority.Normal,
                    null
                    );

                return true;
            }
            catch//(Exception ex)
            {
                return false;
            }
        }

        #endregion
    }
}