Newtonsoft.Json.JsonSerializationException: Self referencing loop

>    /// <summary>  
    /// 对象集合转换Json  
    /// </summary>  
    /// <param name="array">集合对象</param>  
    /// <returns>Json字符串</returns>  
    public static string ToJson(IEnumerable array)
    {
        string jsonString = "[";
        foreach (object item in array)
        {
            jsonString += ToJson(item) + ",";
        }
        jsonString.Remove(jsonString.Length - 1, jsonString.Length);
        return jsonString + "]";
    }

    /// <summary>  
    /// 普通集合转换Json  
    /// </summary>  
    /// <param name="array">集合对象</param>  
    /// <returns>Json字符串</returns>  
    public static string ToArrayString(IEnumerable array)
    {
        string jsonString = "[";
        foreach (object item in array)
        {
            jsonString = ToJson(item.ToString()) + ",";
        }
        jsonString.Remove(jsonString.Length - 1, jsonString.Length);
        return jsonString + "]";
    }

    /// <summary>  
    /// Datatable转换为Json  
    /// </summary>  
    /// <param name="table">Datatable对象</param>  
    /// <returns>Json字符串</returns>  
    public static string ToJson(DataTable dt)
    {
        StringBuilder jsonString = new StringBuilder();
        jsonString.Append("[");
        DataRowCollection drc = dt.Rows;
        for (int i = 0; i < drc.Count; i++)
        {
            jsonString.Append("{");
            for (int j = 0; j < dt.Columns.Count; j++)
     

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