ASP.NET缓存全解析4：应用程序数据缓存

/// <summary>
/// 获取当前应用程序指定CacheKey的Cache对象值 
/// </summary>
/// <param name="CacheKey">索引键值</param>
/// <returns>返回缓存对象</returns> 
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对象值
/// </summary>
/// <param name="CacheKey">索引键值</param>
/// <param name="objObject">缓存对象</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对象值
/// </summary>
/// <param name="CacheKey">索引键值</param>
/// <param name="objObject">缓存对象</param>
/// <param name="absoluteExpiration">绝对过期时间</param>
/// <param name="slidingExpiration">最后一次访问所插入对象时与该对象过期时之间的时间间隔</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);
}       
protected void Page_Load(object sender, EventArgs e)
{
    string CacheKey = "cachetest";
    object objModel = GetCache(CacheKey);//从缓存中获取
    if (objModel == null)//缓存里没有
    {
        objModel = DateTime.Now;//把当前时间进行缓存
        if (objModel != null)
        {
            int CacheTime = 30;//缓存时间30秒
            SetCache(CacheKey, objModel, DateTime.Now.AddSeconds(CacheTime), TimeSpan.Zero);//写入缓存
        }
    }
    Label1.Text = objModel.ToString();
}