C# 寫入XML文檔三種方法詳細介紹

2020-01-24 03:37:52

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我在以前的博客中介紹了如何使用XmlDocument類對XML進行操作，以及如何使用LINQ to XML對XML進行操作。它們分別使用了XmlDocument類和XDocument類。在本文中，我再介紹一個類，XmlTextWriter。我們分別用這三個類將同樣的xml內容寫入文檔，看一看哪種寫法最直觀、簡便。
我們要寫入的XML文檔內容為

復制代碼代碼如下:

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

（1）使用XmlDocument類：

復制代碼代碼如下:

 
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類：

復制代碼代碼如下:

 
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類：

復制代碼代碼如下:

 
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)來構造 
// encoding默認為 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(); 
} 