Adding tags to textwriter?

How do I add an <abc> tag in a start and </abc> 开发者_运维问答tag in end tag in textwriter?

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Use an XmlWriter. Write your starting root element. Then pass the XmlWriter to the XSL transform. It will continue writing. When that's done, write your end root element:

public static void WrapTransform(
    Stream outputStream, 
    string styleSheetUri, 
    string documentUri)
{
    var transform = new XslCompiledTransform();
    using (var styleSheetReader = XmlReader.Create(styleSheetUri))
    {
        transform.Load(styleSheetReader);
    }

    using (var wrapper = XmlWriter.Create(outputStream))
    {
        wrapper.WriteStartElement("Root");
        transform.Transform(documentUri, wrapper);
        wrapper.WriteEndElement();
    }
}