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