Linq实现对XML的简单增删查改
一、传统DOM创建XML方法
private static void CreateXmlDocWithDom() { XmlDocument doc =new XmlDocument(); XmlElement inventory = doc.CreateElement("Inventory"); XmlElement car = doc.CreateElement("Car"); car.SetAttribute("ID", "1000"); XmlElement name = doc.CreateElement("PetName"); name.InnerText = "Jimbo"; XmlElement color = doc.CreateElement("Color"); color.InnerText = "Red"; XmlElement make = doc.CreateElement("Make"); make.InnerText = "Xuhang"; car.AppendChild(name); car.AppendChild(color); car.AppendChild(make); inventory.AppendChild(car); doc.AppendChild(inventory); string savePath = @"E:\LinqToXML\Sample\InventoryWithDom.xml"; doc.Save(savePath); }
二、用LinqToXML创建
精简模式：
public static void CreateXmlDocWithLinqToXml() { XElement doc = new XElement("Inventory", new XElement("Car", new XAttribute("ID", "1000"), new XElement("PetName", "Jimbo"), new XElement("Color", "green"), new XElement("Make", "Xuhang"))); string savePath = @"E:\LinqToXML\Sample\InventoryWithLinq.xml"; doc.Save(savePath); }
完整模式（包含版本号，字符集以及样式表）：
public static void CreateFullXDocument() { XDocument doc = new XDocument(new XDeclaration("1.0", "utf-8", "yes"), new XComment("Current Inventory of Cars"), new XProcessingInstruction("xml-stylesheet", "href='MyStyles.css' title='Compact' type='text/css'"), new XElement("Inventory", new XElement("Car", new XAttribute("ID", "1"), new XElement("PetName", "Jimbo"), new XElement("Color", "Green"), new XElement("Make", "Xuhang")), new XElement("Car", new XAttribute("ID", "2"), new XElement("PetName", "MeLvin"), new XElement("Color", "Red"), new XElement("Make", "Guizhu")))); string savePath = @"E:\LinqToXML\Sample\FullInventory.xml"; doc.Save(savePath); }
三、将数组或其它存储集合里的数据导入XML
public static void MakeXElementFromArray() { var people = new[] { new {FristName="Mandy",age=32}, new {FristName="Andrew",age=40}, new {FristName="Dave",age=41}, new {FristName="Sara",age=31}, }; //XElement peopleDoc=new XElement("People",from c in people select new XElement("Person",new XAttribute("Age",c.age), // new XElement("FirstName",c.FristName))); var m =people.Select(p => new XElement("Person", new XAttribute("Age", p.age), new XElement("FirstName", p.FristName))); XElement peopleDoc = new XElement("People", m); Console.WriteLine(peopleDoc); }
四、读取XML文件
public static void ParseAndLoadExistingXml() { string myElement = @"<Car ID='2'> <PetName>MeLvin</PetName> <Color>Red</Color> <Make>Guizhu</Make> </Car>"; XElement newElement = XElement.Parse(myElement); Console.WriteLine(newElement); Console.WriteLine(); XDocument myDocument = XDocument.Load(@"E:\LinqToXML\Sample\InsertInventory.xml"); Console.WriteLine(myDocument); }
五、插入新的节点
public static void InsertNewElement() { XDocument myDocument = XDocument.Load(@"E:\LinqToXML\Sample\InsertInventory.xml"); Random r=new Random(); XElement newElement = new XElement("Car", new XAttribute("ID",r.Next(100)), new XElement("PetName", "Baoma"), new XElement("Color", "yellow"), new XElement("Make", "Mrxu")); myDocument.Descendants("Inventory").First().Add(newElement); string savePath = @"E:\LinqToXML\Sample\InsertInventory.xml"; myDocument.Save(savePath); }
六、删除某组节点
public static void DeleteNodeFromDoc() { XElement doc = new XElement("Inventory", new XElement("Car", new XAttribute("ID", "1000"), new XElement("PetName", "Jimbo"), new XElement("Color", "green"), new XElement("Make", "Xuhang"))); doc.Descendants("PetName").Remove(); Console.WriteLine(doc); }
七、查询某条记录
public static void LookUpColorFromMake(string make) { XDocument myDocument = XDocument.Load(@"E:\LinqToXML\Sample\InsertInventory.xml"); var makefor = from car in myDocument.Descendants("Car") where (string)car.Element("Make") == make select car.Attribute("ID").Value; //select car.Element("Color").Value; //var makefor = myDocument.Descendants("Car").Where(p => ((string)p.Element("Make")).Equals("Mrxu")).Select(p => p.Attribute("ID").Value); string data = String.Empty; foreach (var item in makefor) { data += String.Format("-{0}",item); } Console.WriteLine(data); }
八、更新数据信息
public static void UpdateXmlDate() { XDocument myDocument = XDocument.Load(@"E:\LinqToXML\Sample\InsertInventory.xml"); var makefor = myDocument.Descendants("Car").Where(p => ((string) p.Element("Make")).Equals("Mrxu")); foreach (var xElement in makefor) { xElement.Element("Make").Value = "Xuhang"; } Console.WriteLine(myDocument); }
九、示例
static void Main(string[] args) { //CreateXmlDocWithDom(); //CreateXmlDocWithLinqToXml(); //CreateFullXDocument(); //DeleteNodeFromDoc(); //InsertNewElement(); //ParseAndLoadExistingXml(); //MakeXElementFromArray(); //LookUpColorFromMake("Mrxu"); //UpdateXmlDate(); MakeXElementFromArray(); Console.ReadKey(); }
源码下载地址：链接：http://pan.baidu.com/s/1mg5MRJa 密码：lyn5