Newtonsoft.Json.JsonSerializationException: Self referencing loop

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

/// <summary>
/// Summary description for Menu
/// </summary>
public class Menu
{
    public Menu()
    {
        //
        // TODO: Add constructor logic here
        //
    }

    public int ID { get; set; }

    public int ParentMenuID { get; set; }

    public string MenuName { get; set; }

    public string MenuCode { get; set; }

    public string MenuClickURL { get; set; }

}

 4、使用的构造JSON数据格式的类（此类不是本人写的，来源于互联网）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Text;
using System.Reflection;
using System.Collections;
using System.Data;
using System.Data.Common;

/// <summary>
/// Summary description for FormatToJson
/// </summary>
public class FormatToJson
{
    public FormatToJson()
    {
        //
        // TODO: Add constructor logic here
        //
    }
    /// <summary> 
    /// List转成json  
    /// </summary> 
    /// <typeparam name="T"></typeparam> 
    /// <param name="jsonName"></param> 
    /// <param name="list"></param> 
    /// <returns></returns> 
    public static string ListToJson<T>(IList<T> list, string jsonName)
    {
        StringBuilder Json = new StringBuilder();
        if (string.IsNullOrEmpty(jsonName))
            jsonName = list[0].GetType().Name;
        Json.Append("{\"" + jsonName + "\":[");
        if (list.Count > 0)
        {
            for (int i = 0; i < list.Count; i++)
            {
                T obj = Activator.CreateInstance<T>();
            

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