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XmlDocument doc = new XmlDocument();
//<?xml-stylesheet type="text/xsl" href="rss.xsl" version="1.0"?>
doc.AppendChild(doc.CreateXmlDeclaration("1.0", "utf-8", null)); //声明
//WriteProcessingInstruction("xml-stylesheet",""type='text/xsl' href='../csdn.xsl'");
XmlProcessingInstruction newPI;
String PItext = "type=\"text/xsl\" href=\"index.xsl\"";
newPI = doc.CreateProcessingInstruction("xml-stylesheet", PItext);
XmlElement root = doc.DocumentElement;
doc.InsertBefore(newPI, root);