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public class StaticCacheTest { private static IDictionary<string, object> _dic; private static object locker = new object(); private static IDictionary<string, object> CachedDic { get { if (_dic == null) { lock (locker) { if (_dic == null) { _dic = new Dictionary<string, object>(); } } } return _dic; } } public static object GetObject(string key) { return CachedDic[key]; } public static void SetObject(string key, object obj) { lock (locker) { CachedDic[key] = obj; } } } public partial class _Default : System.Web.UI.Page { private const string KEY = "CurrentTime"; protected void Page_Load(object sender, EventArgs e) { String curTime = System.DateTime.Now.ToString(); if (HttpContext.Current.Application[KEY] == null) { HttpContext.Current.Application.Lock(); HttpContext.Current.Application[KEY] = curTime; HttpContext.Current.Application.UnLock(); } if (HttpContext.Current.Cache[KEY] == null) { HttpContext.Current.Cache.Insert(KEY, curTime); } if (StaticCacheTest.GetObject(KEY) == null) //本质上就是HttpRuntime.Cache的实现方式 { StaticCacheTest.SetObject(KEY, curTime); } if (HttpRuntime.Cache[KEY] == null) { HttpRuntime.Cache.Insert(KEY, curTime); //HttpRuntime.Cache与HttpContext.Current.Cache是同一对象,建议使用HttpRuntime.Cache } TextBox1.Text = HttpContext.Current.Application[KEY].ToString(); TextBox2.Text=HttpContext.Current.Cache[KEY].ToString(); TextBox3.Text=StaticCacheTest.GetObject(KEY).ToString(); } }
第1与第3只适合存储少量数据（小于1M），否则性能上会有损失。而HttpRuntime.Cache则在内存的使用效率上和功能上（例如缓存依赖、过期策略等）都有所增强，所以应该在实际应用中尽量使用它。
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原文地址：http://www.cnblogs.com/lonlywaiting/p/4185998.html
