Newtonsoft.Json.JsonSerializationException: Self referencing loop

nbsp;   /// <returns>Json字符串</returns>  
    public static string ToJson(DataSet dataSet)
    {
        string jsonString = "{";
        foreach (DataTable table in dataSet.Tables)
        {
            jsonString += "\"" + table.TableName + "\":" + ToJson(table) + ",";
        }
        jsonString = jsonString.TrimEnd(',');
        return jsonString + "}";
    }

    /// <summary> 
    /// 过滤特殊字符 
    /// </summary> 
    /// <param name="s"></param> 
    /// <returns></returns> 
    private static string String2Json(String s)
    {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < s.Length; i++)
        {
            char c = s.ToCharArray()[i];
            switch (c)
            {
                case '\"':
                    sb.Append("\\\""); break;
                case '\\':
                    sb.Append("\\\\"); break;
                case '/':
                    sb.Append("\\/"); break;
                case '\b':
                    sb.Append("\\b"); break;
                case '\f':
                    sb.Append("\\f"); break;
                case '\n':
&n

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