用C#创建XML， XML格式化输出

demo:

XmlDocument doc = new XmlDocument();

XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", "GB2312", null);

doc.AppendChild(dec);

//创建一个根节点（一级）

XmlElement root = doc.CreateElement("First");

doc.AppendChild(root);

//创建节点（二级）

XmlNode node = doc.CreateElement("Seconde");

//创建节点（三级）

XmlElement element1 = doc.CreateElement("Third1");

element1.SetAttribute("Name", "Sam");

element1.SetAttribute("ID", "");

element1.InnerText = "Sam Comment";

node.AppendChild(element1);

XmlElement element2 = doc.CreateElement("Third2");

element2.SetAttribute("Name", "Round");

element2.SetAttribute("ID", "");

element2.InnerText = "Round Comment";

node.AppendChild(element2);

root.AppendChild(node);

doc.Save(@"d:\bb.xml");

Console.Write(doc.OuterXml);

格式化输出函数：

private static string formatXml(object xml){

    XmlDocument xd;

    if(xml is XmlDocument) {

        xd=xml as XmlDocument;

    }else{

        xd = new XmlDocument();

        xd.LoadXml(xml as string);

    }

    StringBuilder sb = new StringBuilder();

    StringWriter sw = new StringWriter(sb);

    XmlTextWriter xtw = null;

    try{

        xtw = new XmlTextWriter(sw);

        xtw.Formatting = Formatting.Indented;

        xtw.Indentation = ;

        xtw.IndentChar = '\t';

        xd.WriteTo(xtw);

    }finally{

        if (xtw != null)

            xtw.Close();

    }

    return sb.ToString();

}