XhtmlTextWriter中的表格边框

Question

我正在使用XhtmlTextWriter创建一些XHTML代码。

我想创建一个带边框的表。

private string NewTable()
{
    string str = "ROWS";
    StringWriter stringWriter = new StringWriter();
    using (XhtmlTextWriter writer = new XhtmlTextWriter(stringWriter))
    {
        writer.AddAttribute(HtmlTextWriterAttribute.Width, "500");
        writer.AddAttribute(HtmlTextWriterAttribute.Border, "2");
        writer.RenderBeginTag(HtmlTextWriterTag.Table);               
        writer.Write(str);
        writer.RenderEndTag();
    }
    return stringWriter.ToString();
}

输出：

<table width="500">
        ROWS
</table>

缺少border属性。