xml创建问题，着急，在线等！！

System.IO.FileStream xmlFileStream = new System.IO.FileStream(mXmlFileName, System.IO.FileMode.Create);
////创建Writer文本流
System.Xml.XmlTextWriter xmlWriter = new System.Xml.XmlTextWriter(xmlFileStream, System.Text.Encoding.Default);
//////写出xml标题头

xmlWriter.WriteStartDocument(true);

xmlWriter.WriteStartAttribute( "xmlns ", null, "http://www.w3.org/2000/10/XMLSchema ");
xmlWriter.WriteEndAttribute();
xmlWriter.WriteAttributeString( "xmlns ", "po ", null, "http://contoso.com/po ");
xmlWriter.WriteEndAttribute();
xmlWriter.WriteStartElement( "DataSetProjects ", "11 ", "http://passport.kubao.com ");
MessageBox.Show( "ok ");
string fileName=mXmlFileName;


看看是哪错了？老出错报错为：处于状态 Prolog 的标记 StartAttribute 将导致无效的 XML 文档。

[解决办法]
这样创建头要好些吧

//Generate Xml Document
System.Xml.XmlDocument xmldoc;
System.Xml.XmlNode nRoot, nNode;


xmldoc = new XmlDocument();
//xml头
xmldoc.AppendChild(xmldoc.CreateXmlDeclaration( "1.0 ", "utf-8 ", " "));
//Root根节点
nRoot = xmldoc.CreateNode(XmlNodeType.Element, "Records ", " ");
// .........往nRoot中加入其它子节点
xmldoc.AppendChild(nRoot);
[解决办法]
常用创建xml文件的两种方法：

1、XmlDocument ：
XmlDocument doc = new XmlDocument();
............
doc.Save( "data.xml ");

2、XmlWriter:
XmlWriter writer = XmlWriter.Create( "output.xml ");
writer.WriteStartElement( "book ");
writer.WriteElementString( "price ", "19.95 ");
writer.WriteEndElement();
writer.Flush();