在网上找了很多次XmlWriter格式化（自动缩进）输出的写法，每次用完就忘了，在此备忘：
System.Xml.XmlDocument doc = new XmlDocument(); //Your Code...中间对XmlDocument的一些加载、操作 //开始格式化代码 System.Xml.XmlWriterSettings set = new XmlWriterSettings(); set.Indent = true; set.IndentChars = "\t"; set.Encoding = System.Text.Encoding.UTF8; System.IO.MemoryStream stream = new System.IO.MemoryStream(); System.Xml.XmlWriter writer = XmlWriter.Create(stream, set); //此处也可以用一个StringBuilder代替stream, 但容易遇到编码问题 doc.Save(writer); //输出，完结 string html = System.Text.Encoding.UTF8.GetString(stream.ToArray()); Response.Write(html);