http://memcachedproviders.codeplex.com/提供的Memcached客户端支持Asp.net站点中的Session同步，其原理是接管Asp.net的Session处理，同时在后台使用数据库支持完成WEB集群的Session的同步。具体实现步骤如下：
1：数据库准备
下载完毕Memcached providers之后，在解压目录下有：
一个用于创建数据库表，一个用于创建这个provider的需要用到的存储过程。
2：配置sessionState
sessionState的配置如下，为了完整性期间，这里给出Web.config的全部配置部分，包括分布式缓存的Memcached的配置：
<?xml version=
"1.0"
?>
<!--
For more information
on
how to configure your ASP.NET application, please visit
http:
//go.microsoft.com/fwlink/?LinkId=169433
-->
<configuration>
<configSections>
<section name=
"cacheProvider"
type=
"MemcachedProviders.Cache.CacheProviderSection, MemcachedProviders"
allowDefinition=
"MachineToApplication"
restartOnExternalChanges=
"true"
/>
<sectionGroup name=
"enyim.com"
>
<section name=
"memcached"
type=
"Enyim.Caching.Configuration.MemcachedClientSection, Enyim.Caching"
/>
</sectionGroup>
<section name=
"log4net"
type=
"log4net.Config.Log4NetConfigurationSectionHandler,log4net"
/>
</configSections>
<log4net>
<!-- Define some output appenders -->
<appender name=
"ConsoleAppender"
type=
"log4net.Appender.ConsoleAppender"
>
<layout type=
"log4net.Layout.PatternLayout"
>
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}]
- %message%newline" />
</layout>
</appender>
<!--<threshold value=
"OFF"
/>-->
<!-- Setup the root category, add the appenders and
set
the
default
priority -->
<root>
<priority value=
"WARN"
/>
<appender-
ref
ref
=
"ConsoleAppender"
>
<filter type=
"log4net.Filter.LevelRangeFilter"
>
<levelMin value=
"WARN"
/>
<levelMax value=
"FATAL"
/>
</filter>
</appender-
ref
>
</root>
</log4net>
<enyim.com>
<memcached>
<servers>
<!-- put your own server(s) here-->
<add address=
"192.168.0.96"
port=
"11211"
/>
<!--<add address=
"192.168.0.101"
port=
"11211"
/>-->
</servers>
<socketPool minPoolSize=
"10"
maxPoolSize=
"100"
connectionTimeout=
"00:00:10"
deadTimeout=
"00:02:00"
/>
</memcached>
</enyim.com>
<cacheProvider defaultProvider=
"MemcachedCacheProvider"
>
<providers>
<add name=
"MemcachedCacheProvider"
type=
"MemcachedProviders.Cache.MemcachedCacheProvider, MemcachedProviders"
keySuffix=
"_MySuffix_"
defaultExpireTime=
"2000"
/>
</providers>
</cacheProvider>
<connectionStrings>
<add name=
"ApplicationServices"
connectionString=
"Data Source=192.168.0.96;Initial Catalog=ForestFire;User Id=sa;Password=sa;"
providerName=
"System.Data.SqlClient"
/>
</connectionStrings>
<system.web>
<sessionState cookieless=
"false"
regenerateExpiredSessionId=
"true"
mode=
"Custom"
customProvider=
"MemcachedSessionProvider"
>
<providers>
<add name=
"MemcachedSessionProvider"
type=
"MemcachedProviders.Session.SessionStateProvider,MemcachedProviders"
connectionStringName=
"ApplicationServices"
dbType=
"SQL"
writeExceptionsToEventLog=
"false"
/>
</providers>
</sessionState>
<compilation debug=
"true"
targetFramework=
"4.0"
/>
<authentication mode=
"Forms"
>
<forms loginUrl=
"~/Account/Login.aspx"
timeout=
"2880"
/>
</authentication>
<membership>
<providers>
<clear/>
<add name=
"AspNetSqlMembershipProvider"
type=
"System.Web.Security.SqlMembershipProvider"
connectionStringName=
"ApplicationServices"
enablePasswordRetrieval=
"false"
enablePasswordReset=
"true"
requiresQuestionAndAnswer=
"false"
requiresUniqueEmail=
"false"
maxInvalidPasswordAttempts=
"5"
minRequiredPasswordLength=
"6"
minRequiredNonalphanumericCharacters=
"0"
passwordAttemptWindow=
"10"
applicationName=
"/"
/>
</providers>
</membership>
<profile>
<providers>
<clear/>
<add name=
"AspNetSqlProfileProvider"
type=
"System.Web.Profile.SqlProfileProvider"
connectionStringName=
"ApplicationServices"
applicationName=
"/"
/>
</providers>
</profile>
<roleManager enabled=
"false"
>
<providers>
<clear/>
<add name=
"AspNetSqlRoleProvider"
type=
"System.Web.Security.SqlRoleProvider"
connectionStringName=
"ApplicationServices"
applicationName=
"/"
/>
<add name=
"AspNetWindowsTokenRoleProvider"
type=
"System.Web.Security.WindowsTokenRoleProvider"
applicationName=
"/"
/>
</providers>
</roleManager>
</system.web>
<system.webServer>
<modules runAllManagedModulesForAllRequests=
"true"
/>
</system.webServer>
</configuration>
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3：代码
代码没有任何稀奇的，和传统的Session操作一样，如下：
protected void Page_Load(object sender, EventArgs e)
{
try
{
Session["name"] = "豆腐";
}
catch (Exception err)
{
Response.Write(err.Message);
}
}
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = Session["name"].ToString();
}
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