C# · 12月 21, 2021

C# 写入XML文档三种方法详细介绍

我在以前的博客中介绍了如何使用XmlDocument类对XML进行操作,以及如何使用LINQ to XML对XML进行操作。它们分别使用了XmlDocument类和XDocument类。在本文中,我再介绍一个类,XmlTextWriter。我们分别用这三个类将同样的xml内容写入文档,看一看哪种写法最直观、简便。
我们要写入的XML文档内容为
复制代码 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:
复制代码 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:
复制代码 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:
复制代码 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。