C# 写入XML文档三种方法详细介绍

我们要写入的XML文档内容为 

代码如下:

<?xml version="1.0" encoding="UTF-8"?>
<Contacts>
<Contact id="01">
<Name>Daisy Abbey</Name>
<Gender>female</Gender>
</Contact>
</Contacts>

（1）使用XmlDocument类：

代码如下:

var xmlDoc = new XmlDocument();
//Create the xml declaration first
xmlDoc.AppendChild(xmlDoc.CreateXmlDeclaration("1.0", "utf-8", null));
//Create the root node and append into doc
var el = xmlDoc.CreateElement("Contacts");
xmlDoc.AppendChild(el);
// Contact
XmlElement elementContact = xmlDoc.CreateElement("Contact");
XmlAttribute attrID = xmlDoc.CreateAttribute("id");
attrID.Value = "01";
elementContact.Attributes.Append(attrID);
el.AppendChild(elementContact);
// Contact Name
XmlElement elementName = xmlDoc.CreateElement("Name");
elementName.InnerText = "Daisy Abbey";
elementContact.AppendChild(elementName);
// Contact Gender
XmlElement elementGender = xmlDoc.CreateElement("Gender");
elementGender.InnerText = "female";
elementContact.AppendChild(elementGender);
xmlDoc.Save("test1.xml");

（2）使用LINQ to XML 的XDocument类：

代码如下:

var doc = new XDocument(
new XElement("Contacts", new XElement("Contact", new XAttribute("id", "01"), new XElement("Name", "Daisy Abbey"), new XElement("Gender", "female") ) ));
doc.Save("test2.xml");

（3） 使用XmlTextWriter类：

代码如下:

String filename = String.Concat("test3.xml");
using (StreamWriter sw = new StreamWriter(filename))
{
// Create Xml Writer.
XmlTextWriter xmlWriter = new XmlTextWriter(sw);
// 也可以使用public XmlTextWriter(string filename, Encoding encoding)来构造
// encoding默认为 UTF-8.
//XmlTextWriter writer = new XmlTextWriter("test3.xml", null);
// Set indenting so that its easier to read XML when open in Notepad and such apps.
xmlWriter.Formatting = Formatting.Indented;
// This will output the XML declaration
xmlWriter.WriteStartDocument();
xmlWriter.WriteStartElement("Contacts");
xmlWriter.WriteStartElement("Contact");
xmlWriter.WriteAttributeString("id", "01");
xmlWriter.WriteElementString("Name", "Daisy Abbey");
xmlWriter.WriteElementString("Gender", "female");
// close contact </contact>
xmlWriter.WriteEndElement();
// close contacts </contact>
xmlWriter.WriteEndElement();
xmlWriter.WriteEndDocument();
xmlWriter.Close();
}

从上面的代码基本上还是可以看出来，使用LINQ to XML是最简便的。