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Web caching in ASP.NET 2.0 (C#)
Web caching technology in ASP.NET and C# is helpful for popular website reducing its server workload and improving access times. This tutorial will show you how to use web caching save data to RAM, and improve data access times therefore.
First, import the namespace of System.Web.Caching
Declare the variables
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static bool itemRemoved = false;
static CacheItemRemovedReason reason;
CacheItemRemovedCallback onRemove = null; |
Define the method of AddItemToCache, it will use Cache.Add to add items to cache
public void AddItemToCache(Object sender, EventArgs e)
{
itemRemoved = false; onRemove = new CacheItemRemovedCallback(this.RemovedCallback); if (Cache["Key1"] == null)
Cache.Add("Key1", "Caching", null, DateTime.Now.AddSeconds(60), TimeSpan.Zero, CacheItemPriority.High, onRemove); |
Define the method of RemoveItemFromCache, it will use Cache.Remove to remove items from cache
public void RemoveItemFromCache(Object sender, EventArgs e)
{
if (Cache["Key1"] != null)
Cache.Remove("Key1"); |
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When using the method of Cache.Remove , it will be leaded to invoke RemovedCallback method
public void RemovedCallback(String k, Object v, CacheItemRemovedReason r)
{
itemRemoved = true;
reason = r; } |
Page_Load
protected void Page_Load(object sender, EventArgs e)
{
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>"); } |
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The HTML of the web page
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<body>
<Form id="Form1" runat="server">
<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"/> </Form>
</body>
</html> |
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