Enterprise Library 4.1 Caching Block 图文笔记

一，下载并安装好Enterprise Library 4.1

二，新建一个Web应用程序

三，右键点击Web.Config 文件 使用 Edit Enterprise Library Configuration 可以编辑Web.Config，建立一个缓存程序块

1.可以在Cache Managers 中建立多个缓存管理器，然后设置默认使用哪个管理器

2.可以右键为管理器添加一种存储方式，如果不加就是默认的内存存储。

3.管理器的名字用来做Key，获取存储区对象

4.保存后，打开Web.config 会看到

<cachingConfiguration defaultCacheManager="Cache Manager">
<cacheManagers>
<add expirationPollFrequencyInSeconds="60" maximumElementsInCacheBeforeScavenging="1000"
numberToRemoveWhenScavenging="10" backingStoreName="Null Storage"
type="Microsoft.Practices.EnterpriseLibrary.Caching.CacheManager, Microsoft.Practices.EnterpriseLibrary.Caching, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
name="Cache Manager" />
<add expirationPollFrequencyInSeconds="60" maximumElementsInCacheBeforeScavenging="1000"
numberToRemoveWhenScavenging="10" backingStoreName="Isolated Storage"
type="Microsoft.Practices.EnterpriseLibrary.Caching.CacheManager, Microsoft.Practices.EnterpriseLibrary.Caching, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
name="Cache Manager1" />
</cacheManagers>
<backingStores>
<add partitionName="IsolatedCache" encryptionProviderName=""
type="Microsoft.Practices.EnterpriseLibrary.Caching.BackingStoreImplementations.IsolatedStorageBackingStore, Microsoft.Practices.EnterpriseLibrary.Caching, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
name="Isolated Storage" />
<add encryptionProviderName="" type="Microsoft.Practices.EnterpriseLibrary.Caching.BackingStoreImplementations.NullBackingStore, Microsoft.Practices.EnterpriseLibrary.Caching, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
name="Null Storage" />
</backingStores>
</cachingConfiguration>

四，添加引用

using Microsoft.Practices.EnterpriseLibrary.Caching;

using Microsoft.Practices.EnterpriseLibrary.Caching.Expirations;

五.写代码（例子我是复制菩提树下的杨过的代码）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Microsoft.Practices.EnterpriseLibrary.Caching;
using Microsoft.Practices.EnterpriseLibrary.Caching.Expirations;
namespace CachingBlock
{
public class MyData
{
public string Name { set; get; }
public int Age { set; get; }
public string Color { set; get; }
}
public partial class WebForm1 : System.Web.UI.Page
{
const string KEYNAME = "myDateCache";//缓存的键值
ICacheManager cacheManager;
protected void Page_Load(object sender, EventArgs e)
{
cacheManager = CacheFactory.GetCacheManager();//实例化ICachemanager
}
protected void btnWrite_Click(object sender, EventArgs e)
{
//生成要缓存的数据(实际开发中可以是从数据库查询出来的数据)
List<MyData> _list = new List<MyData>{
new MyData(){ Age=1, Color="Yellow", Name="China"},
new MyData{ Age=2,Color="Black",Name="USA"}
};
AbsoluteTime _ExpireTime = new AbsoluteTime(DateTime.Now.AddSeconds(30));//指定30秒后过期
cacheManager.Add(KEYNAME, _list, CacheItemPriority.Normal, null, _ExpireTime);//加入缓存
Response.Write("Cache写入完成," + DateTime.Now.ToString());
}
protected void btnRead_Click(object sender, EventArgs e)
{
this.R1.DataSource = GetCacheData();
this.R1.DataBind();
Response.Write("Cache加载完成," + DateTime.Now.ToString());
}
/// <summary>
/// 获取缓存数据
/// </summary>
/// <returns></returns>
public List<MyData> GetCacheData()
{
List<MyData> _cacheData = cacheManager.GetData(KEYNAME) as List<MyData>;
if (null == _cacheData)//记得一定要加此判断(因为缓存可能过期)
{
//如果缓存数据为空，则重新生成数据，并加入缓存(为检测效果，特地把Color与Name前加了一个"New")
_cacheData = new List<MyData>
{
new MyData(){ Age=1, Color="New Yellow", Name="New China"},
new MyData{ Age=2,Color="New Black",Name="New USA"}
};
AbsoluteTime _ExpireTime = new AbsoluteTime(DateTime.Now.AddSeconds(30));//指定30秒后过期
cacheManager.Add(KEYNAME, _cacheData, CacheItemPriority.Normal, null, _ExpireTime);
}
return _cacheData;
}
protected void btnRemove_Click(object sender, EventArgs e)
{
cacheManager.Remove(KEYNAME);
Response.Write("Cache清空完成," + DateTime.Now.ToString());
}
}
}

示例源码下载：EL41Sample.rar