Newtonsoft.Json.JsonSerializationException: Self referencing loop

;    PropertyInfo[] pi = obj.GetType().GetProperties();
                Json.Append("{");
                for (int j = 0; j < pi.Length; j++)
                {
                    Type type = pi[j].GetValue(list[i], null).GetType();
                    Json.Append("\"" + pi[j].Name.ToString() + "\":" + StringFormat(pi[j].GetValue(list[i], null).ToString(), type));

                    if (j < pi.Length - 1)
                    {
                        Json.Append(",");
                    }
                }
                Json.Append("}");
                if (i < list.Count - 1)
                {
                    Json.Append(",");
                }
            }
        }
        Json.Append("]}");
        return Json.ToString();
    }

    /// <summary> 
    /// List转成json  
    /// </summary> 
    /// <typeparam name="T"></typeparam> 
    /// <param name="list"></param> 
    /// <returns></returns> 
    public static string ListToJson<T>(IList<T> list)
    {
        object obj = list[0];
        return ListToJson<T>(list, obj.GetType().Name);
    }

    ///

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