Newtonsoft.Json.JsonSerializationException: Self referencing loop

nbsp;      if (dt.Rows.Count > 0)
        {
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                Json.Append("{");
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    Type type = dt.Rows[i][j].GetType();
                    Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + StringFormat(dt.Rows[i][j].ToString(), type));
                    if (j < dt.Columns.Count - 1)
                    {
                        Json.Append(",");
                    }
                }
                Json.Append("}");
                if (i < dt.Rows.Count - 1)
                {
                    Json.Append(",");
                }
            }
        }
        Json.Append("]}");
        return Json.ToString();
    }

    /// <summary>  
    /// DataReader转换为Json  
    /// </summary>  
    /// <param name="dataReader">DataReader对象</param>  
    /// <returns>Json字符串</returns>  
    public static string ToJson(DbDataReader dataReader)
    {
     &n

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