LINQ to XML提供了对所有LINQ功能(如标准查询运算符,编程接口等)的轻松访问。集成在.NET框架中的LINQ to XML还充分利用了.NET框架功能,如调试,编译时检查,强类型化还有更多要说的。
在使用LINQ to XML时,将XML文档加载到内存很容易,并且查询和文档修改也更加容易,也可以将内存中存在的XML文档保存到磁盘并进行序列化,它消除了开发人员学习稍微复杂的XML查询语言的需要。
LINQ to XML在System.Xml.Linq命名空间中具有强大的功能,它具有使用XML所需的全部19个必需类,这些类是以下类。
C#
链接:https://www.learnfk.comhttps://www.learnfk.com/linq/linq-xml.html
来源:LearnFk无涯教程网
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(); } } }
VB
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
编译并执行以上C#或VB的代码时,将产生以下输出-
Department Name - Account Department Name - Sales Department Name - Pre-Sales Department Name - Marketing Press any key to continue.
C#
链接:https://www.learnfk.comhttps://www.learnfk.com/linq/linq-xml.html
来源:LearnFk无涯教程网
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(); } } }
VB
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
编译并执行以上C#或VB的代码时,将产生以下输出-
Department Name - Support Department Name - Account Department Name - Sales Department Name - Pre-Sales Department Name - Marketing Department Name - Finance Press any key to continue.
C#
链接:https://www.learnfk.comhttps://www.learnfk.com/linq/linq-xml.html
来源:LearnFk无涯教程网
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(); } } }
VB
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
编译并执行以上C#或VB的代码时,将产生以下输出-
Department Name - Support Department Name - Account Department Name - Pre-Sales Department Name - Marketing Department Name - Finance Press any key to continue.
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