Cache对象
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对于每个应用程序都需要创建该类的一个实例，并且只要对用的应用程序域保持活动，该实例便保持有效，有关此类实例的所有信息都需要通过HttpContext对象的Cache属性或Page对象的Cache属性来提供。
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新建一个网站，包括一个网页，代码如下：
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1、Default.aspx代码：
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<%@ Page Language=”C#” AutoEventWireup=”true” CodeFile=”Default.aspx.cs” Inherits=”_Default” %>
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<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
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<html xmlns=”http://www.w3.org/1999/xhtml” >
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<head runat=”server”>
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<title>无标题页</title>
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<script runat=”server” language=”C#”>
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static bool itemRemoved = false;
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static CacheItemRemovedReason reason;
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CacheItemRemovedCallback onRemove = null;
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public void RemovedCallback(String k, Object v, CacheItemRemovedReason r)
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{
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itemRemoved = true;
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reason = r;
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}
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public void AddItemToCache(Object sender, EventArgs e)
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{
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itemRemoved = false;
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onRemove = new CacheItemRemovedCallback(this.RemovedCallback);
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if (Cache["Key1"] == null)
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Cache.Add(“Key1″, “Value1″, null, DateTime.Now.AddSeconds(60), TimeSpan.Zero, CacheItemPriority.High, onRemove);
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}
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public void RemoveItemFromCache(Object sender, EventArgs e)
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{
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if (Cache["Key1"] != null)
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Cache.Remove(“Key1″);
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}
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</script>
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</head>
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<body>
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<form id=”form1″ runat=”server”>
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<div>
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<input id=”Submit1″ type=”submit” onserverclick=”AddItemToCache” value=”Add Item To Cache” runat=”server” />
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<input id=”Submit2″ type=”submit” onserverclick=”RemoveItemFromCache” value=”Remove Item From Cache” runat=”server”/></div>
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</form>
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<%if (itemRemoved)
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{
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Response.Write(“RemovedCallback event raised.”);
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Response.Write(“<BR>”);
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Response.Write(“Reason:<B>” + reason.ToString() + “</B>”);
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}
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else
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{
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Response.Write(“Value of cache key:<B>” + Server.HtmlEncode(Cache["Key1"] as string) + “</B>”);
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}
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%>
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</body>
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</html>
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来源:csdn