实现自己的配置读取器

    [HostProtection(SecurityAction.LinkDemand, MayLeakOnAbort = true)]
    }

配置文件：
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
 <configSections>
  <section name="Assemblys"
     type="Dcms.Common.AddinSectionHandler,Dcms.Common"/>
 </configSections>
 <Assemblys>
  <Assembly dllFile="a.dll" addinClass="a" />
  <Assembly dllFile="b.dll" addinClass="b" />
 </Assemblys>
</configuration>
参考文章：http://www.codeproject.com/aspnet/ConfigSections.asp