App_Code/CacheManage.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Web.Caching;

/// <summary>
/// CacheManage 的摘要说明
/// </summary>
public class CacheManage
{
    static DateTime exp = DateTime.Now.AddMinutes(30);

    public CacheManage()
    {

    }

    public static object GetCache(string key)
    {
        if (HttpContext.Current.Cache[key] == null)
            return null;
        else
            return HttpContext.Current.Cache.Get(key);
    }

    public static void SetCache(string key, object value)
    {
        if (HttpContext.Current.Cache[key] == null)
            //HttpContext.Current.Cache.Insert(key, value, null, System.Web.Caching.Cache.NoAbsoluteExpiration, exp);
            HttpContext.Current.Cache.Insert(key, value, null, exp, System.Web.Caching.Cache.NoSlidingExpiration);
        else
            HttpContext.Current.Cache[key] = value;
    }

    public static void RemoveCache(string key)
    {
        if (HttpContext.Current.Cache[key] != null)
            HttpContext.Current.Cache.Remove(key);
    }
}