Newtonsoft.Json.JsonSerializationException: Self referencing loop

nbsp;  {
                foreach (DataRow dr in dt.Rows)
                {
                    menu.Add(new Menu() {
                    ID=Int32.Parse(dr["ID"].ToString()),
                    ParentMenuID = Int32.Parse(dr["ParentMenuID"].ToString()),
                    MenuName = dr["MenuName"].ToString(),
                    MenuCode = dr["MenuCode"].ToString(),
                    MenuClickURL = dr["MenuClickURL"].ToString()
                    });
                }
            }

            if (menu.Count > 0)
            {
                Response.Write(FormatToJson.ListToJson<Menu>(menu));
            }
        }
 
    }
   
    //上级Menu的ID
    private Int32? ParentID
    {
        get
        {
            try
            {
                return Int32.Parse(Request.QueryString["parentID"]);
            }
            catch
            {
                return null;
            }
        }
    }
}

 

3、使用到的Menu实体类

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