Newtonsoft.Json.JsonSerializationException: Self referencing loop

bsp;                   sb.Append("\\n"); break;
                case '\r':
                    sb.Append("\\r"); break;
                case '\t':
                    sb.Append("\\t"); break;
                default:
                    sb.Append(c); break;
            }
        }
        return sb.ToString();
    }

    /// <summary> 
    /// 格式化字符型、日期型、布尔型 
    /// </summary> 
    /// <param name="str"></param> 
    /// <param name="type"></param> 
    /// <returns></returns> 
    private static string StringFormat(string str, Type type)
    {
        if (type == typeof(string))
        {
            str = String2Json(str);
            str = "\"" + str + "\"";
        }
        else if (type == typeof(DateTime))
        {
            str = "\"" + str + "\"";
        }毕业论文 
        else if (type == typeof(bool))
        {
            str = str.ToLower();
        }
        return str;
    }
}

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