LINQ to XML提供了对所有LINQ功能的轻松访问,例如标准查询运算符,编程接口等.在.NET框架中集成,LINQ to XML还充分利用.NET框架功能,如调试,编译时检查,强大的打字等等.
使用LINQ to XML时,将XML文档加载到内存中很容易,查询和文档修改更容易.还可以将存储在内存中的XML文档保存到磁盘并对其进行序列化.它使开发人员无需学习有点复杂的XML查询语言.
LINQ to XML在System.Xml.Linq命名空间中具有强大的功能.这包含了使用XML的所有必需的19个类.这些类是以下类.
XAttribute
XCData
XComment
XContainer
XDeclaration
XDocument
XDocumentType
XElement
XName
XNamespace
XNode
XNodeDocumentOrderComparer
XNodeEqualityComparer
XObject
XObjectChange
XObjectChangeEventArgs
XObjectEventHandler
XProcessingInstruction
XText
using System; using System.Collections.Generic; using System.Linq; using System.Xml.Linq; namespace LINQtoXML { class ExampleOfXML { static void Main(string[] args) { string myXML = @"<Departments> <Department>Account</Department> <Department>Sales</Department> <Department>Pre-Sales</Department> <Department>Marketing</Department> </Departments>"; XDocument xdoc = new XDocument(); xdoc = XDocument.Parse(myXML); var result = xdoc.Element("Departments").Descendants(); foreach (XElement item in result) { Console.WriteLine("Department Name - " + item.Value); } Console.WriteLine("\nPress any key to continue."); Console.ReadKey(); } } }
Imports System.Collections.Generic Imports System.Linq Imports System.Xml.Linq Module Module1 Sub Main(ByVal args As String()) Dim myXML As String = "<Departments>" & vbCr & vbLf & "<Department>Account</Department>" & vbCr & vbLf & "<Department>Sales</Department>" & vbCr & vbLf & "<Department>Pre-Sales</Department>" & vbCr & vbLf & "<Department>Marketing</Department>" & vbCr & vbLf & "</Departments>" Dim xdoc As New XDocument() xdoc = XDocument.Parse(myXML) Dim result = xdoc.Element("Departments").Descendants() For Each item As XElement In result Console.WriteLine("Department Name - " + item.Value) Next Console.WriteLine(vbLf & "Press any key to continue.") Console.ReadKey() End Sub End Module
当编译并执行上述C#或VB代码时,它会产生以下结果 :
Department Name - Account Department Name - Sales Department Name - Pre-Sales Department Name - Marketing Press any key to continue.
using System; using System.Collections.Generic; using System.Linq; using System.Xml.Linq; namespace LINQtoXML { class ExampleOfXML { static void Main(string[] args) { string myXML = @"<Departments> <Department>Account</Department> <Department>Sales</Department> <Department>Pre-Sales</Department> <Department>Marketing</Department> </Departments>"; XDocument xdoc = new XDocument(); xdoc = XDocument.Parse(myXML); //Add new Element xdoc.Element("Departments").Add(new XElement("Department", "Finance")); //Add new Element at First xdoc.Element("Departments").AddFirst(new XElement("Department", "Support")); var result = xdoc.Element("Departments").Descendants(); foreach (XElement item in result) { Console.WriteLine("Department Name - " + item.Value); } Console.WriteLine("\nPress any key to continue."); Console.ReadKey(); } } }
Imports System.Collections.Generic Imports System.Linq Imports System.Xml.Linq Module Module1 Sub Main(ByVal args As String()) Dim myXML As String = "<Departments>" & vbCr & vbLf & "<Department>Account</Department>" & vbCr & vbLf & "<Department>Sales</Department>" & vbCr & vbLf & "<Department>Pre-Sales</Department>" & vbCr & vbLf & "<Department>Marketing</Department>" & vbCr & vbLf & "</Departments>" Dim xdoc As New XDocument() xdoc = XDocument.Parse(myXML) xdoc.Element("Departments").Add(New XElement("Department", "Finance")) xdoc.Element("Departments").AddFirst(New XElement("Department", "Support")) Dim result = xdoc.Element("Departments").Descendants() For Each item As XElement In result Console.WriteLine("Department Name - " + item.Value) Next Console.WriteLine(vbLf & "Press any key to continue.") Console.ReadKey() End Sub End Module
当编译并执行上述C#或VB代码时,它会产生以下结果 :
Department Name - Support Department Name - Account Department Name - Sales Department Name - Pre-Sales Department Name - Marketing Department Name - Finance Press any key to continue.
using System; using System.Collections.Generic; using System.Linq; using System.Xml.Linq; namespace LINQtoXML { class ExampleOfXML { static void Main(string[] args) { string myXML = @"<Departments> <Department>Support</Department> <Department>Account</Department> <Department>Sales</Department> <Department>Pre-Sales</Department> <Department>Marketing</Department> <Department>Finance</Department> </Departments>"; XDocument xdoc = new XDocument(); xdoc = XDocument.Parse(myXML); //Remove Sales Department xdoc.Descendants().Where(s =>s.Value == "Sales").Remove(); var result = xdoc.Element("Departments").Descendants(); foreach (XElement item in result) { Console.WriteLine("Department Name - " + item.Value); } Console.WriteLine("\nPress any key to continue."); Console.ReadKey(); } } }
Imports System.Collections.Generic Imports System.Linq Imports System.Xml.Linq Module Module1 Sub Main(args As String()) Dim myXML As String = "<Departments>" & vbCr & vbLf & "<Department>Support</Department>" & vbCr & vbLf & "<Department>Account</Department>" & vbCr & vbLf & "<Department>Sales</Department>" & vbCr & vbLf & "<Department>Pre-Sales</Department>" & vbCr & vbLf & "<Department>Marketing</Department>" & vbCr & vbLf & "<Department>Finance</Department>" & vbCr & vbLf & "</Departments>" Dim xdoc As New XDocument() xdoc = XDocument.Parse(myXML) xdoc.Descendants().Where(Function(s) s.Value = "Sales").Remove() Dim result = xdoc.Element("Departments").Descendants() For Each item As XElement In result Console.WriteLine("Department Name - " + item.Value) Next Console.WriteLine(vbLf & "Press any key to continue.") Console.ReadKey() End Sub End Module
当上面的C#或VB代码是编译并执行,它产生以下结果 :
Department Name - Support Department Name - Account Department Name - Pre-Sales Department Name - Marketing Department Name - Finance Press any key to continue.