LINQ to XML操作XML文件的方法，如創(chuàng)建XML文件、添加新的元素到XML文件中、修改XML文件中的元素、刪除XML文件中的元素等。

1. 創(chuàng)建XML文件

string xmlFilePath = Server.MapPath("Data/Product.xml");XDocument doc = new XDocument (new XDeclaration("1.0", "utf-8", "yes"),new XElement("Products",new XElement("Product",new XAttribute("ID", 1),new XElement("ProductName", "LINQ to XML"),new XElement("UnitPrice", 10),new XElement("Remark", "LINQ to XML操作"))) );// 保存為XML文件 doc.Save(xmlFilePath);// 顯示XML文件內(nèi)容 Response.Write(doc); // 設置網(wǎng)頁顯示的形式為XML文件 Response.ContentType = "text/xml"; Response.End(); <?xml version="1.0" encoding="utf-8" standalone="yes"?> <Products><Product ID="1"><ProductName>LINQ to XML</ProductName><UnitPrice>10</UnitPrice><Remark>LINQ to XML操作</Remark></Product> </Products> XElement xml = new XElement ("Root",new XElement("Product",new XAttribute("ID", 1)) );xml.Save(Environment.CurrentDirectory + @"\" + "Product.xml"); <?xml version="1.0" encoding="utf-8"?> <Root><Product ID="1" /> </Root>

　　根據(jù)從數(shù)據(jù)庫中查詢的數(shù)據(jù)結構生成一個XML文件：

using (NorthwindContext context = new NorthwindContext()) {var products = from p in context.Productsselect new{p.ProductID,p.ProductName,p.UnitPrice};var xml = new XElement("Products",from p in products.ToList()select new XElement("Product",new XElement("ProductID", p.ProductID),new XElement("ProductName", p.ProductName),new XElement("UnitPrice", p.UnitPrice)));xml.Save(Environment.CurrentDirectory + @"\" + "Products.xml"); }

2. 加載XML文件

XDocument doc = XDocument.Load(Environment.CurrentDirectory + @"\Product.xml");foreach (XNode node in doc.Nodes()) {Console.WriteLine(node.ToString()); }

　　運行輸出：

<!--Created by LINQ to XML--> <Products><Product><ProductID>1</ProductID><ProductName>LINQ to XML</ProductName><UnitPrice>10</UnitPrice></Product><Product><ProductID>2</ProductID><ProductName>LINQ to SQL</ProductName><UnitPrice>20</UnitPrice></Product> </Products> XDocument doc = XDocument.Load(Environment.CurrentDirectory + @"\Product.xml");foreach (XNode node in doc.Nodes().OfType<XElement>()) {Console.WriteLine(node.ToString()); } <Products><Product><ProductID>1</ProductID><ProductName>LINQ to XML</ProductName><UnitPrice>10</UnitPrice></Product><Product><ProductID>2</ProductID><ProductName>LINQ to SQL</ProductName><UnitPrice>20</UnitPrice></Product> </Products> XDocument doc = XDocument.Load(Environment.CurrentDirectory + @"\Product.xml");foreach (XElement element in doc.Elements()) {Console.WriteLine(element.ToString()); } XElement el = XElement.Load(Environment.CurrentDirectory + @"\Product.xml");foreach (XElement e in el.Elements("Product")) {Console.WriteLine(e.Element("ProductName").Value); } XDocument doc = XDocument.Load(Environment.CurrentDirectory + @"\" + "Product.xml");var query = from p in doc.Descendants("Product")where p.Attribute("ID").Value == "1"select p;foreach (var item in query) {Console.WriteLine(item.Element("ProductName").Value); } XDocument doc = XDocument.Load(Environment.CurrentDirectory + @"\" + "Product.xml");var query = from p in doc.Root.Elements("Product")select new{ProductID = p.Element("ProductID").Value,ProductName = p.Element("ProductName").Value,UnitPrice = p.Element("UnitPrice").Value}; foreach (var item in query) {Console.WriteLine("{0}-{1}-{2}", item.ProductID, item.ProductName, item.UnitPrice); }

3. 添加元素到XML文件

XElement el = XElement.Load(Server.MapPath("Data/Product.xml"));XElement product = new XElement ("Product",new XAttribute("ID", 2),new XElement("ProductName", "LINQ to Object"),new XElement("UnitPrice", 20m),new XElement("Remark", "") );el.Add(product); el.Save(Server.MapPath("Data/Product.xml")); <?xml version="1.0" encoding="utf-8"?> <Products><Product ID="1"><ProductName>LINQ to XML</ProductName><UnitPrice>10</UnitPrice><Remark>LINQ to XML操作</Remark></Product><Product ID="2"><ProductName>LINQ to Object</ProductName><UnitPrice>20</UnitPrice><Remark></Remark></Product> </Products>

4. 修改XML文件中元素

XElement el = XElement.Load(Server.MapPath("Data/Product.xml"));IEnumerable<XElement> products = from e in el.Elements("Product")where e.Attribute("ID").Value == "1"select e; if (products.Count() > 0) {XElement product = products.First();product.SetAttributeValue("ID", 3);product.ReplaceNodes(new XElement("ProductName", "LINQ to XML Version 2"),new XElement("UnitPrice", 30)); }el.Save(Server.MapPath("Data/Product.xml")); <?xml version="1.0" encoding="utf-8"?> <Products><Product ID="3"><ProductName>LINQ to XML Version 2</ProductName><UnitPrice>30</UnitPrice></Product><Product ID="2"><ProductName>LINQ to Object</ProductName><UnitPrice>20</UnitPrice><Remark></Remark></Product> </Products>

5. 刪除XML文件中的元素

XElement el = XElement.Load(Server.MapPath("Data/Product.xml"));IEnumerable<XElement> products = from e in el.Elements("Product")where e.Attribute("ID").Value == "2"select e; if (products.Count() > 0) {products.First().Remove(); }el.Save(Server.MapPath("Data/Product.xml")); XElement xml = XElement.Load(Environment.CurrentDirectory + @"\" + "Product.xml"); xml.Element("Product").Remove(); // 刪除第一個Product子元素 xml.Elements("Product").Remove(); // 刪除全部Product子元素 xml.Save(Environment.CurrentDirectory + @"\" + "Product.xml"); xml.SetElementValue("Product", null); // 刪除第一個Product子元素 XElement xml = XElement.Load(Environment.CurrentDirectory + @"\" + "Product.xml"); xml.Element("Product").SetElementValue("ProductID", 1); // 修改ProductID子元素 xml.Element("Product").SetElementValue("ProductID", null); // 刪除ProductID子元素

6. 將XML文件中屬性轉(zhuǎn)換為元素

XElement el = XElement.Load(Server.MapPath("Data/Product.xml"));IEnumerable<XElement> products = from e in el.Elements("Product")where e.Attribute("ID").Value == "1"select e; if (products.Count() > 0) {XAttribute attr = products.First().FirstAttribute;products.First().AddFirst(new XElement(attr.Name, attr.Value));attr.Remove(); }el.Save(Server.MapPath("Data/Product.xml")); <?xml version="1.0" encoding="utf-8"?> <Products><Product><ID>1</ID><ProductName>LINQ to XML</ProductName><UnitPrice>30</UnitPrice></Product> </Products>

7.XML節(jié)點屬性

　　1> 添加屬性

XElement xml = XElement.Load(Environment.CurrentDirectory + @"\" + "Product.xml");XElement product=(from p in xml.Elements("Product")select p).First(); product.Add(new XAttribute("ID", 1));xml.Save(Environment.CurrentDirectory + @"\" + "Product.xml");

　　2> 修改屬性

XElement xml = XElement.Load(Environment.CurrentDirectory + @"\" + "Product.xml");XElement product = (from p in xml.Elements("Product")select p).First(); product.SetAttributeValue("ID", 2);xml.Save(Environment.CurrentDirectory + @"\" + "Product.xml");

　　3> 刪除屬性

XElement xml = XElement.Load(Environment.CurrentDirectory + @"\" + "Product.xml");XElement product = (from p in xml.Elements("Product")select p).First(); product.Attribute("ID").Remove();xml.Save(Environment.CurrentDirectory + @"\" + "Product.xml"); 創(chuàng)作挑戰(zhàn)賽新人創(chuàng)作獎勵來咯，堅持創(chuàng)作打卡瓜分現(xiàn)金大獎

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