asp.net web api json 循环引用问题

Loop Reference handling in Web API

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Http;
using System.Web.Mvc;
using System.Web.Optimization;
using System.Web.Routing;

namespace CircularReferenceSample
{
    // Note: For instructions on enabling IIS6 or IIS7 classic mode 
    // visit http://go.microsoft.com/?linkId=9394801

    public class WebApiApplication : System.Web.HttpApplication
    {
        protected void Application_Start（）
        {
            AreaRegistration.RegisterAllAreas（）;

            WebApiConfig.Register（GlobalConfiguration.Configuration）;
            FilterConfig.RegisterGlobalFilters（GlobalFilters.Filters）;
            RouteConfig.RegisterRoutes（RouteTable.Routes）;
            BundleConfig.RegisterBundles（BundleTable.Bun

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     文件       17869  2014-06-06 07:55  description.html
     文件        1670  2014-06-06 07:55  description\offline.js
     文件           0  2014-06-06 07:55  description\Combined.css
     文件           0  2014-06-06 07:55  description\0aac1760-b513-488a-ba57-e31d9413a075Combined.css
     文件       10457  2014-06-06 07:55  description\Galleries.css
     文件        1727  2014-06-06 07:55  description\Layout.css
     文件       71647  2014-06-06 07:55  description\Brand.css
     文件        3369  2014-06-06 07:55  description\iframedescription.css
     文件       14808  2014-06-06 07:55  license.rtf
     目录           0  2014-06-06 07:55  C#\.nuget\
     文件         169  2014-06-06 07:55  C#\.nuget\NuGet.Config
     文件      630784  2014-06-06 07:55  C#\.nuget\NuGet.exe
     文件        7053  2014-06-06 07:55  C#\.nuget\NuGet.targets
     文件        1297  2014-06-06 07:55  C#\CircularReferenceSample.sln
     文件       37376  2014-06-06 07:55  C#\CircularReferenceSample.v11.suo
     目录           0  2014-06-06 07:55  C#\CircularReferenceSample\
     目录           0  2014-06-06 07:55  C#\CircularReferenceSample\App_Data\
     文件     3211264  2014-06-06 07:55  C#\CircularReferenceSample\App_Data\CircularReferenceSampleContext-20120902014237.mdf
     文件     1048576  2014-06-06 07:55  C#\CircularReferenceSample\App_Data\CircularReferenceSampleContext-20120902014237_log.ldf
     文件     3211264  2014-06-06 07:55  C#\CircularReferenceSample\App_Data\CircularReferenceSampleContext-20120902021029.mdf
     文件     1048576  2014-06-06 07:55  C#\CircularReferenceSample\App_Data\CircularReferenceSampleContext-20120902021029_log.ldf
     目录           0  2014-06-06 07:55  C#\CircularReferenceSample\App_Start\
     文件        2186  2014-06-06 07:55  C#\CircularReferenceSample\App_Start\BundleConfig.cs
     文件         289  2014-06-06 07:55  C#\CircularReferenceSample\App_Start\FilterConfig.cs
     文件         614  2014-06-06 07:55  C#\CircularReferenceSample\App_Start\RouteConfig.cs
     文件        1020  2014-06-06 07:55  C#\CircularReferenceSample\App_Start\WebApiConfig.cs
     目录           0  2014-06-06 07:55  C#\CircularReferenceSample\bin\
     文件       16640  2014-06-06 07:55  C#\CircularReferenceSample\CircularReferenceSample.csproj
     文件        1087  2014-06-06 07:55  C#\CircularReferenceSample\CircularReferenceSample.csproj.user
     目录           0  2014-06-06 07:55  C#\CircularReferenceSample\Content\
     文件       13944  2014-06-06 07:55  C#\CircularReferenceSample\Content\Site.css
............此处省略123个文件信息