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Cache對象
對于每個應用程序都需要創(chuàng)建該類的一個實例，并且只要對用的應用程序域保持活動，該實例便保持有效，有關此類實例的所有信息都需要通過HttpContext對象的Cache屬性或Page對象的Cache屬性來提供。
新建一個網(wǎng)站，包括一個網(wǎng)頁，代碼如下：
1、Default.aspx代碼：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>無標題頁</title>
<script runat="server" language="C#">
static bool itemRemoved = false;
static CacheItemRemovedReason reason;
CacheItemRemovedCallback onRemove = null;
public void RemovedCallback(String k, Object v, CacheItemRemovedReason r)
{
itemRemoved = true;
reason = r;
}
public void AddItemToCache(Object sender, EventArgs e)
{
itemRemoved = false;
onRemove = new CacheItemRemovedCallback(this.RemovedCallback);
if (Cache["Key1"] == null)
Cache.Add("Key1", "Value1", null, DateTime.Now.AddSeconds(60), TimeSpan.Zero, CacheItemPriority.High, onRemove);
}
public void RemoveItemFromCache(Object sender, EventArgs e)
{
if (Cache["Key1"] != null)
Cache.Remove("Key1");
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input id="Submit1" type="submit" onserverclick="AddItemToCache" value="Add Item To Cache" runat="server" />
<input id="Submit2" type="submit" onserverclick="RemoveItemFromCache" value="Remove Item From Cache" runat="server"/></div>
</form>
<%if (itemRemoved)
{
Response.Write("RemovedCallback event raised.");
Response.Write("<BR>");
Response.Write("Reason:<B>" + reason.ToString() + "</B>");
}
else
{
Response.Write("Value of cache key:<B>" + Server.HtmlEncode(Cache["Key1"] as string) + "</B>");
}
%>
</body>
</html>
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