C#操作xml文档增删改查(Linq to XML)

Posted 2022-02-06 zed-h

1.创建xml

 1         public static void CreateXmlDoc()
 2         
 3             XElement myDoc =
 4                 new XElement("Customers",
 5                     new XElement("Customer", new XAttribute("ID", "1"),
 6                         new XElement("Usename", "Rock  Zed"),
 7                         new XElement("FirstName", "Rock"),
 8                         new XElement("LastName", "Zed"),
 9                         new XElement("PhoneNo", "35481254")
10                     )
11                );
12             myDoc.Save("Customer.xml");
13         

  创建的xml文档内容如下：

<?xml version="1.0" encoding="utf-8"?>
<Customers>
  <Customer ID="1">
    <Usename>Rock  Zed</Usename>
    <FirstName>Rock</FirstName>
    <LastName>Zed</LastName>
    <PhoneNo>35481254</PhoneNo>
  </Customer>
</Customers>

2.获取XML文档内容

 1         #region Load XML doc
 2         public static XDocument GetXmlDoc()
 3         
 4             try
 5             
 6                 XDocument myDoc = XDocument.Load(System.Web.HttpContext.Current.Server.MapPath("~/Customer.xml"));
 7                 return myDoc;
 8             
 9             catch (System.IO.FileNotFoundException ex)
10             
11                 return null;
12             
13         
14         #endregion
15         //将xml内容与自定义类相对应 获取到对应类的集合
16         public static List<Customer> GetXmlData()
17         
18             List<Customer> listCs = new List<Customer>();
19             XDocument myDoc = XmlHelper.GetXmlDoc();
20             if (myDoc != null)
21             
22                 var query = from c in myDoc.Descendants("Customer")
23                             select new Customer
24                             
25                                 ID=c.FirstAttribute.Value,
26                                 UseName = c.Element("Usename").Value,
27                                 FirstName = c.Element("FirstName").Value,
28                                 LastName = c.Element("LastName").Value,
29                                 Phone = c.Element("PhoneNo").Value
30                             ;
31                 foreach (var item in query)
32                 
33                     listCs.Add(item);
34                 
35             
36             return listCs;
37         

以上的Customer类的属性和xml文档节点内容相对应 Customer类如下

    public class Customer
    
        public string ID  get; set; 
        public string UseName  get; set; 
        public string FirstName  get; set; 
        public string LastName  get; set; 
        public string Phone  get; set; 
    

3.向XML文档添加内容

        #region Insert new item
        public static void InsertNewElement(Customer cs)
        
            try
            
                // Load current document. 
                XDocument myDoc = XDocument.Load(System.Web.HttpContext.Current.Server.MapPath("~/Customer.xml"));
                Random r = new Random();
                // add new element 
                XElement newElement = new XElement("Customer",new XAttribute("ID", r.Next(5000)),
                          new XElement("Usename", cs.UseName),
                          new XElement("FirstName", cs.FirstName),
                          new XElement("LastName", cs.LastName),
                          new XElement("PhoneNo", cs.Phone));
                myDoc.Descendants("Customers").First().Add(newElement);
                // Save changes.
                myDoc.Save(System.Web.HttpContext.Current.Server.MapPath("~/Customer.xml"));
            
            catch (Exception ex)
            
                throw ex;
            
        
        #endregion

4.修改XML文档内容

 1         public static void EditElement(Customer cs)
 2         
 3             try
 4             
 5                 // Load current document. 
 6                 XDocument myDoc = XDocument.Load(System.Web.HttpContext.Current.Server.MapPath("~/Customer.xml"));
 7                 //by ID load xml 
 8                 IEnumerable<XElement> products = from c in myDoc.Descendants("Customer") where c.FirstAttribute.Value == cs.ID select c;
 9                 if (products.Count() > 0)
10                 
11                     XElement product = products.First();
12                     //replace xml element
13                     product.ReplaceNodes( new XElement("Usename", cs.UseName), new XElement("FirstName", cs.FirstName), new XElement("LastName", cs.LastName), new XElement("PhoneNo", cs.Phone));
14                 
15                 myDoc.Save(HttpContext.Current.Server.MapPath("~/Customer.xml"));
16             
17             catch (Exception ex)
18             
19                 throw ex;
20             
21         

5.删除XML文档节点

 1         public static void DeleteElement(string id)
 2         
 3             try
 4             
 5                 XDocument myDoc = XDocument.Load(System.Web.HttpContext.Current.Server.MapPath("~/Customer.xml"));
 6                 IEnumerable<XElement> customer = from c in myDoc.Descendants("Customer") where c.FirstAttribute.Value == id select c;
 7                 if (customer.Count() > 0)
 8                 
 9                     customer.First().Remove();
10                 
11                 myDoc.Save(HttpContext.Current.Server.MapPath("~/Customer.xml"));
12             
13             catch (Exception ex)
14             
15                 throw ex;
16             
17         

6.通过指定值查询特定XML节点内容

 1         #region Query customer
 2         public static Customer FindCustomerByID(string id)
 3         
 4             try
 5             
 6                 Customer cs = new Customer();
 7                 // Load current document. 
 8                 XDocument myDoc = XDocument.Load(System.Web.HttpContext.Current.Server.MapPath("~/Customer.xml"));
 9                 var query = from c in myDoc.Root.Elements("Customer")
10                             where (string)c.FirstAttribute.Value == id
11                             select new Customer
12                             
13                                 ID = c.FirstAttribute.Value,
14                                 UseName = c.Element("Usename").Value,
15                                 FirstName = c.Element("FirstName").Value,
16                                 LastName = c.Element("LastName").Value,
17                                 Phone = c.Element("PhoneNo").Value
18                             ;
19 
20                 foreach (var item in query)
21                 
22                     cs.ID = item.ID;
23                     cs.UseName = item.UseName;
24                     cs.FirstName = item.FirstName;
25                     cs.LastName = item.LastName;
26                     cs.Phone = item.Phone;
27                 
28                 return cs;
29             
30             catch (Exception ex)
31             
32                 return null;
33             
34         
35         #endregion

7.结合以上方法做了一个MVC操作XML文档的增删改查的Demo 源码地址如下

https://github.com/ZedH/XmlTest