很弱的问题，怎样往XML文件中添加新节点？

[cityeremite]

下面的代码是其中一段，我想实现的功能是在已经存在的test.xml文件中继续增加节点，可是每次执行，它都把原xml文件中已有的数据清空了，怎样实现类似文本文件APPEND操作的方法呢？

请高人指点！

XmlTextWriter txtWriter = new XmlTextWriter(@"..\..\test.xml",System.Text.Encoding.UTF8 );
txtWriter.Formatting = Formatting.Indented;
txtWriter.WriteStartDocument(true);
txtWriter.WriteDocType("Employees",null,null,null);
txtWriter.WriteComment("this is a test");
txtWriter.WriteStartElement("Employees");
txtWriter.WriteStartElement("employee",null);
txtWriter.WriteElementString("FirstName","John");
txtWriter.WriteElementString("LastName","Smith");
txtWriter.WriteElementString("DateOfBirth","08/09/1968");
txtWriter.WriteElementString("DateOfJoining","08/09/1998");
txtWriter.WriteEndElement();
txtWriter.WriteEndElement();
txtWriter.Flush();
txtWriter.Close();

[luyiping]

也有append之类的方法啊

[dldl]

严重同意楼上意见

[mableboy]

Root=doc.DoumentElement;
XmlNode node=root.CreateElement();
node.InnerXml="<name>mableboy</name";
root.AppendChild(node);

这个具体加到哪儿，你只要定位到她的父节点就可以了！

[cdyxh]

學習中,幫你頂一下

[xixigongzhu]

这样就可以了：
string filename = @"..\..\test.xml";
XmlDocument doc = new XmlDocument();
if (!File.Exists(filename)) {
doc.AppendChild(doc.CreateXmlDeclaration("1.0", "utf-8", "yes"));
doc.AppendChild(doc.CreateDocumentType("Employees",null,null,null));
doc.AppendChild(doc.CreateComment("this is a test"));
doc.AppendChild(doc.CreateElement("Employees"));
} else {
doc.Load(filename);
}
XmlElement ele = doc.DocumentElement;
XmlElement child = doc.CreateElement("employee");
XmlElement fname = doc.CreateElement("FirstName");
fname.InnerText = "John";
child.AppendChild(fname);
fname = doc.CreateElement("LastName");
fname.InnerText = "Smith";
child.AppendChild(fname);
fname = doc.CreateElement("DateOfBirth");
fname.InnerText = "08/09/1968";
child.AppendChild(fname);
fname = doc.CreateElement("DateOfJoining");
fname.InnerText = "08/09/1998";
child.AppendChild(fname);
ele.AppendChild(child);
XmlTextWriter txtWriter = new XmlTextWriter(filename,System.Text.Encoding.UTF8 );
txtWriter.Formatting = Formatting.Indented;
doc.WriteTo(txtWriter);
txtWriter.Close();

[巍巍清风]

用XmlTextWriter是会把原来的文件重写过的，先把它load进来，就不会了。

[jinzhijie]

支持mableboy() 的