linq to xml(增删改查)

xml文件

<?xml version="1.0" encoding="utf-8"?><book Type="必修课" ISBN="7-111-19149-2">数据结构严蔚敏30.00<book Type="必修课" ISBN="7-111-19149-3">路由型与交换型互联网基础程庆梅27.00<book Type="选修课" ISBN="7-111-19149-1">计算机操作系统张文明28

加载本地xml

 string path = @"C:\Users\asus\Desktop\test.xml";
        XElement xe;        public MainWindow()
        {
            InitializeComponent();
           xe= XElement.Load(path);
        }

自定义一个类

 public class BookModel
        {            public BookModel()
            { }            /// /// 所对应的课程类型            /// private string bookType;            public string BookType
            {                get { return bookType; }                set { bookType = value; }
            }            /// /// 书所对应的ISBN号            /// private string bookISBN;            public string BookISBN
            {                get { return bookISBN; }                set { bookISBN = value; }
            }            /// /// 书名            /// private string bookName;            public string BookName
            {                get { return bookName; }                set { bookName = value; }
            }            /// /// 作者            /// private string bookAuthor;            public string BookAuthor
            {                get { return bookAuthor; }                set { bookAuthor = value; }
            }            /// /// 价格            /// private double bookPrice;            public double BookPrice
            {                get { return bookPrice; }                set { bookPrice = value; }
            }
        
    }

增

  private void Button_Click(object sender, RoutedEventArgs e)
        {
            
            XElement record = new XElement(               new XElement("book",               new XAttribute("Type", "选修课"),              new XAttribute("ISBN", "7-111-19149-1"),               new XElement("title", "计算机操作系统"),               new XElement("author", "张文明"),              new XElement("price", 28.00)));
                         xe.Add(record);
                         xe.Save(path);
        }

删

  private void Button_Click_1(object sender, RoutedEventArgs e)
        {            foreach (var item in xe.Elements("book").Where(x => x.Attribute("ISBN").Value== "7-111-19149-1").ToList())
            {
                item.Remove();
            }
            xe.Save(path);
        }

改

 private void Button_Click_2(object sender, RoutedEventArgs e)
        {            foreach (var item in xe.Elements("book").Where(x => x.Attribute("ISBN").Value == "7-111-19149-1").ToList())
            {
                item.Element("title").Value = "test";
            }
            xe.Save(path);
        }

 

 

查

   private void Button_Click_3(object sender, RoutedEventArgs e)
        {
            ListbookModelList = new List();            foreach (var item in xe.Elements("book").Where(x => x.Attribute("ISBN").Value == "7-111-19149-1").ToList())
            {
                
                BookModel bookModel = new BookModel();
                bookModel.BookType = item.Attribute("Type").Value;
                bookModel.BookISBN = item.Attribute("ISBN").Value;
                bookModel.BookName = item.Element("title").Value;
                bookModel.BookPrice =Convert.ToDouble( item.Element("price").Value);
                bookModel.BookAuthor = item.Element("author").Value;
                bookModelList.Add(bookModel);
            }
            dg1.ItemsSource = bookModelList;
        }

 参考博客：https://www.cnblogs.com/yuer20180726/p/10984234.html