数据缓存依赖、图片防盗链 url重写

数据库缓存依赖
1、数据库缓存依赖
-S服务器名称  -E集成身份验证  -ed启动 -d数据库名称  -et指定缓冲依赖的表名 -t表名
在vs2010的命令提示符中运行（切换到aspnet_regsql.exe所在的目录）
aspnet_regsql.exe -S 127.0.0.1 -E -ed -d myphotos -et -t photos

缓存依赖禁用该数据库
aspnet_regsql -S . -E -dd -d myphotos

2、依赖于数据库的web.config配置
<system.web>
    <caching>
      <sqlCacheDependency enabled="true">
        <databases>
          <add name="myphotos" connectionStringName="connectionString" pollTime="500"/>
        </databases>
      </sqlCacheDependency>
    </caching>

3、 System.Web.Caching.SqlCacheDependency dep = new System.Web.Caching.SqlCacheDependency("myphotos", "photos");
                Cache.Insert("list", list, dep);


进程外session
    StateServer  对象必须可序列化
        1.开始 ASP.NET 状态服务  services.msc
        2.配置webconfig
            <sessionState mode="StateServer" stateConnectionString="tcpip=localhost:42424"></sessionState>
        //





        3.如果是远程的stateserver配置注册表  regedit
            HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aspnet_state\Parameters\AllowRemoteConnection
            设置成1
    




图片防止盗链

 void Application_BeginRequest(object sender, EventArgs e)
    {
        if (Request.RawUrl.Contains("images/"))
        {
            if (Request.UrlReferrer == null || !IsSameDomain(Request.UrlReferrer, Request.Url))
            {
                ////
                Response.ContentType = "image/jpeg";
                string path = Request.MapPath("~/daolian.jpg");
                Response.WriteFile(path);
                //结束请求
                Response.End();
            }
        }
    }
    //判断两个域名是否相等
    bool IsSameDomain(Uri u1,Uri u2)
    {
        return Uri.Compare(u1, u2, UriComponents.HostAndPort, UriFormat.SafeUnescaped, StringComparison.CurrentCultureIgnoreCase) == 0 ? true : false;
    }










url重写


一、原理
void Application_BeginRequest(object sender, EventArgs e)
    {
     //url重写
        HttpApplication app = sender as HttpApplication;
        string url = app.Request.RawUrl;
        Regex r = new Regex("/(\\d+)/details\\.htm",RegexOptions.IgnoreCase);
        Match m = r.Match(url);
        if (m.Success)
        {
            string id = m.Groups[1].Value;
            app.Context.RewritePath("~/PhotoDetails.aspx?id=" + id);
        }
    }

 二、urlRewriter
1、在<configSections>节点加入
 <section name="RewriterConfig" type="URLRewriter.Config.RewriterConfigSerializerSectionHandler, URLRewriter" />
2、在</configSections>之后加入
    
  <RewriterConfig>
    <Rules>
      <RewriterRule>
        <LookFor>~/(\d{4})/(\d{2})/Default\.aspx</LookFor>
        <SendTo>~/Default.aspx?ID=$1</SendTo>
      </RewriterRule>
    </Rules>
  </RewriterConfig>
3、<httpHandlers>中加入
<add verb="*" path="*.aspx" type="URLRewriter.RewriterFactoryHandler, URLRewriter" />
或者 <httpModules>加入
<add type="URLRewriter.ModuleRewriter, URLRewriter" name="ModuleRewriter" />