Newtonsoft.Json.JsonSerializationException: Self referencing loop

<summary>  
    /// 对象转换为Json字符串  
    /// </summary>  
    /// <param name="jsonObject">对象</param>  
    /// <returns>Json字符串</returns>  
    public static string ToJson(object jsonObject)
    {
        string jsonString = "{";
        PropertyInfo[] propertyInfo = jsonObject.GetType().GetProperties();
        for (int i = 0; i < propertyInfo.Length; i++)
        {
            object objectValue = propertyInfo[i].GetGetMethod().Invoke(jsonObject, null);
            string value = string.Empty;
            if (objectValue is DateTime || objectValue is Guid || objectValue is TimeSpan)
            {
                value = "'" + objectValue.ToString() + 毕业论文 "'";
            }
            else if (objectValue is string)
            {
                value = "'" + ToJson(objectValue.ToString()) + "'";
            }
            else if (objectValue is IEnumerable)
            {
                value = ToJson((IEnumerable)objectValue);
            }
            else
            {
                value = ToJson(objectValue.ToString());
            }
            jsonString += "\"" + ToJson(propertyInfo[i].Name) + "\":" + value + ",";
        }
        jsonString.Remove(jsonString.Length - 1, jsonString.Length);
        return jsonString + "}";
    }

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