用C#语言遍历读取和操纵XML文档

Dear 丶 2022-05-29 01:16 166阅读 0赞

实验环境：visual studio2017

问题：

用C\#语言编写控制台应用（.NET Framework）程序，为“Students.xml（该文件在上两篇博客中均写到，由于篇幅所限，不在书写）”为文档增加“总分”与“平均”元素，两元素的文本内容分别是“数学”与“英语”成绩的总分与平均分。

建立控制台应用程序，代码如下所示：

using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using System.Xml;
 namespace work1
 {
 class Program
 {
 static void Main(string[] args)
 {
 string XMLFileName = "c:\\CSharpProg\\Students.xml";
 // XmlDouument doc = new XmlDouument();
 XmlDocument doc = new XmlDocument();
 doc.Load(XMLFileName);
 XmlNodeList nodes = doc.DocumentElement.GetElementsByTagName("总分");
 if(nodes.Count!=0){
 Console.WriteLine("文档中已有"+nodes.Count+"个“总分”节点，无需再添加了！");
 Console.WriteLine();
 return;
 }
 XmlNodeList students = doc.DocumentElement.ChildNodes;
 for (int i = 0; i < students.Count;i++ )
 {
 double sum = Double.Parse(students[i].ChildNodes[4].InnerText) + Double.Parse(students[i].ChildNodes[5].InnerText) ;
 double average = sum / 2;
 XmlElement total = doc.CreateElement("总分");
 
 total.InnerText = sum.ToString();
 students[i].AppendChild(total);
 XmlElement mean = doc.CreateElement("平均");
 mean.InnerText = average.ToString();
 students[i].AppendChild(mean);
 }
 XmlComment c = doc.CreateComment("201511010xxx-xxx实现");
 doc.InsertBefore(c,doc.DocumentElement);
 doc.Save(XMLFileName);
 Console.WriteLine("ok,成功添加！");
 Console.ReadLine();
 }
 }
 }

实验10\_2．用C\#语言编程实现以“Students.xml”为用户文件的Windows窗体登录与注册。

Step1. 创建Windows窗体应用（.NET Framework）程序

Step2. 在项目中添加Windows窗体：XMLBasedLoginRegister，并设置为启动窗体。

修改Program.cs里面 Main()函数的代码：

//Application.Run(newForm1()); //注释此行旧代码

Application.Run(new XMLBasedLoginRegister());  //新增代码，设置启动窗体。

Step3. 在XMLBasedLoginRegister窗体中添加控件并写入代码。

![Image 1][]

建立窗体应用程序，代码如下所示：

注册按钮：

using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows.Forms;
    using System.Xml;
    namespace work2
    {
        public partial class RegisterForm : Form
        {
            public RegisterForm()
            {
                InitializeComponent();
            }
    
            private void label7_Click(object sender, EventArgs e)
            {
    
            }
    
            private void button1_Click(object sender, EventArgs e)
            {
                if ((textBox1.Text == "") || (textBox2.Text == ""))
                {
                    label7.Text = "学号与姓名皆不能为空";
                    return;
                }
                string XMLFileName = "C:\\CSharpProg\\Students.xml";
                XmlDocument doc = new XmlDocument();
                doc.Load(XMLFileName);
                XmlElement student = doc.CreateElement("学生");
                doc.DocumentElement.AppendChild(student);
                XmlElement number = doc.CreateElement("学号");
                number.InnerText = textBox1.Text;
                student.AppendChild(number);
                XmlElement name = doc.CreateElement("姓名");
                name.InnerText = textBox2.Text;
                student.AppendChild(name);
                XmlElement sex = doc.CreateElement("性别");
                if (radioButton1.Checked)
                {
                    sex.InnerText = radioButton1.Text;
                }
                if (radioButton2.Checked)
                {
                    sex.InnerText = radioButton2.Text;
                }
                student.AppendChild(sex);
                XmlElement english = doc.CreateElement("英语");
                english.InnerText = textBox4.Text;
                student.AppendChild(english);
                doc.Save(XMLFileName);
                label7.Text = "OK,您已经注册成功！";
                MessageBox.Show("OK,您已经注册成功", "完成!");
                this.Close();
    
            }
        }
    }

注册按钮.Designer.cs

namespace work2
 {
 partial class RegisterForm
 {
 /// <summary>
 /// Required designer variable.
 /// </summary>
 private System.ComponentModel.IContainer components = null;
 
 /// <summary>
 /// Clean up any resources being used.
 /// </summary>
 /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
 protected override void Dispose(bool disposing)
 {
 if (disposing && (components != null))
 {
 components.Dispose();
 }
 base.Dispose(disposing);
 }
 
 #region Windows Form Designer generated code
 
 /// <summary>
 /// Required method for Designer support - do not modify
 /// the contents of this method with the code editor.
 /// </summary>
 private void InitializeComponent()
 {
 this.label1 = new System.Windows.Forms.Label();
 this.label2 = new System.Windows.Forms.Label();
 this.label3 = new System.Windows.Forms.Label();
 this.label4 = new System.Windows.Forms.Label();
 this.label5 = new System.Windows.Forms.Label();
 this.radioButton1 = new System.Windows.Forms.RadioButton();
 this.radioButton2 = new System.Windows.Forms.RadioButton();
 this.label6 = new System.Windows.Forms.Label();
 this.label7 = new System.Windows.Forms.Label();
 this.textBox1 = new System.Windows.Forms.TextBox();
 this.textBox2 = new System.Windows.Forms.TextBox();
 this.textBox3 = new System.Windows.Forms.TextBox();
 this.textBox4 = new System.Windows.Forms.TextBox();
 this.textBox5 = new System.Windows.Forms.TextBox();
 this.button1 = new System.Windows.Forms.Button();
 this.button2 = new System.Windows.Forms.Button();
 this.SuspendLayout();
 // 
 // label1
 // 
 this.label1.AutoSize = true;
 this.label1.Location = new System.Drawing.Point(168, 52);
 this.label1.Name = "label1";
 this.label1.Size = new System.Drawing.Size(97, 15);
 this.label1.TabIndex = 0;
 this.label1.Text = "欢迎您来注册";
 // 
 // label2
 // 
 this.label2.AutoSize = true;
 this.label2.Location = new System.Drawing.Point(30, 98);
 this.label2.Name = "label2";
 this.label2.Size = new System.Drawing.Size(52, 15);
 this.label2.TabIndex = 1;
 this.label2.Text = "学号：";
 // 
 // label3
 // 
 this.label3.AutoSize = true;
 this.label3.Location = new System.Drawing.Point(30, 128);
 this.label3.Name = "label3";
 this.label3.Size = new System.Drawing.Size(52, 15);
 this.label3.TabIndex = 2;
 this.label3.Text = "姓名：";
 // 
 // label4
 // 
 this.label4.AutoSize = true;
 this.label4.Location = new System.Drawing.Point(30, 191);
 this.label4.Name = "label4";
 this.label4.Size = new System.Drawing.Size(52, 15);
 this.label4.TabIndex = 3;
 this.label4.Text = "专业：";
 // 
 // label5
 // 
 this.label5.AutoSize = true;
 this.label5.Location = new System.Drawing.Point(30, 160);
 this.label5.Name = "label5";
 this.label5.Size = new System.Drawing.Size(52, 15);
 this.label5.TabIndex = 4;
 this.label5.Text = "性别：";
 // 
 // radioButton1
 // 
 this.radioButton1.AutoSize = true;
 this.radioButton1.Location = new System.Drawing.Point(119, 160);
 this.radioButton1.Name = "radioButton1";
 this.radioButton1.Size = new System.Drawing.Size(43, 19);
 this.radioButton1.TabIndex = 5;
 this.radioButton1.TabStop = true;
 this.radioButton1.Text = "男";
 this.radioButton1.UseVisualStyleBackColor = true;
 // 
 // radioButton2
 // 
 this.radioButton2.AutoSize = true;
 this.radioButton2.Location = new System.Drawing.Point(207, 160);
 this.radioButton2.Name = "radioButton2";
 this.radioButton2.Size = new System.Drawing.Size(43, 19);
 this.radioButton2.TabIndex = 6;
 this.radioButton2.TabStop = true;
 this.radioButton2.Text = "女";
 this.radioButton2.UseVisualStyleBackColor = true;
 // 
 // label6
 // 
 this.label6.AutoSize = true;
 this.label6.Location = new System.Drawing.Point(30, 224);
 this.label6.Name = "label6";
 this.label6.Size = new System.Drawing.Size(52, 15);
 this.label6.TabIndex = 7;
 this.label6.Text = "数学：";
 // 
 // label7
 // 
 this.label7.AutoSize = true;
 this.label7.Location = new System.Drawing.Point(30, 254);
 this.label7.Name = "label7";
 this.label7.Size = new System.Drawing.Size(52, 15);
 this.label7.TabIndex = 8;
 this.label7.Text = "英语：";
 this.label7.Click += new System.EventHandler(this.label7_Click);
 // 
 // textBox1
 // 
 this.textBox1.Location = new System.Drawing.Point(119, 92);
 this.textBox1.Name = "textBox1";
 this.textBox1.Size = new System.Drawing.Size(157, 25);
 this.textBox1.TabIndex = 9;
 // 
 // textBox2
 // 
 this.textBox2.Location = new System.Drawing.Point(119, 129);
 this.textBox2.Name = "textBox2";
 this.textBox2.Size = new System.Drawing.Size(157, 25);
 this.textBox2.TabIndex = 10;
 // 
 // textBox3
 // 
 this.textBox3.Location = new System.Drawing.Point(120, 185);
 this.textBox3.Name = "textBox3";
 this.textBox3.Size = new System.Drawing.Size(157, 25);
 this.textBox3.TabIndex = 11;
 // 
 // textBox4
 // 
 this.textBox4.Location = new System.Drawing.Point(119, 214);
 this.textBox4.Name = "textBox4";
 this.textBox4.Size = new System.Drawing.Size(157, 25);
 this.textBox4.TabIndex = 12;
 // 
 // textBox5
 // 
 this.textBox5.Location = new System.Drawing.Point(120, 251);
 this.textBox5.Name = "textBox5";
 this.textBox5.Size = new System.Drawing.Size(157, 25);
 this.textBox5.TabIndex = 13;
 // 
 // button1
 // 
 this.button1.Location = new System.Drawing.Point(52, 315);
 this.button1.Name = "button1";
 this.button1.Size = new System.Drawing.Size(75, 23);
 this.button1.TabIndex = 14;
 this.button1.Text = "提交";
 this.button1.UseVisualStyleBackColor = true;
 this.button1.Click += new System.EventHandler(this.button1_Click);
 // 
 // button2
 // 
 this.button2.Location = new System.Drawing.Point(189, 315);
 this.button2.Name = "button2";
 this.button2.Size = new System.Drawing.Size(75, 23);
 this.button2.TabIndex = 15;
 this.button2.Text = "重置";
 this.button2.UseVisualStyleBackColor = true;
 // 
 // RegisterForm
 // 
 this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 15F);
 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
 this.ClientSize = new System.Drawing.Size(482, 365);
 this.Controls.Add(this.button2);
 this.Controls.Add(this.button1);
 this.Controls.Add(this.textBox5);
 this.Controls.Add(this.textBox4);
 this.Controls.Add(this.textBox3);
 this.Controls.Add(this.textBox2);
 this.Controls.Add(this.textBox1);
 this.Controls.Add(this.label7);
 this.Controls.Add(this.label6);
 this.Controls.Add(this.radioButton2);
 this.Controls.Add(this.radioButton1);
 this.Controls.Add(this.label5);
 this.Controls.Add(this.label4);
 this.Controls.Add(this.label3);
 this.Controls.Add(this.label2);
 this.Controls.Add(this.label1);
 this.Name = "RegisterForm";
 this.Text = "RegisterForm";
 this.ResumeLayout(false);
 this.PerformLayout();
 
 }
 
 #endregion
 
 private System.Windows.Forms.Label label1;
 private System.Windows.Forms.Label label2;
 private System.Windows.Forms.Label label3;
 private System.Windows.Forms.Label label4;
 private System.Windows.Forms.Label label5;
 private System.Windows.Forms.RadioButton radioButton1;
 private System.Windows.Forms.RadioButton radioButton2;
 private System.Windows.Forms.Label label6;
 private System.Windows.Forms.Label label7;
 private System.Windows.Forms.TextBox textBox1;
 private System.Windows.Forms.TextBox textBox2;
 private System.Windows.Forms.TextBox textBox3;
 private System.Windows.Forms.TextBox textBox4;
 private System.Windows.Forms.TextBox textBox5;
 private System.Windows.Forms.Button button1;
 private System.Windows.Forms.Button button2;
 }
 }

登陆按钮.cs

using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows.Forms;
    using System.Xml;
    namespace work2
    {
        public partial class XMLBasedLoginRegister : Form
        {
            public XMLBasedLoginRegister()
            {
                InitializeComponent();
            }
    
            private void label1_Click(object sender, EventArgs e)
            {
    
            }
    
            private void button2_Click(object sender, EventArgs e)
            {
                RegisterForm rf = new RegisterForm();
                rf.Show();
    
            }
    
            private void button1_Click(object sender, EventArgs e)
            {
                bool isstudent = false;
                string file = "C:\\CSharpProg\\Students.xml";
                XmlDocument doc = new XmlDocument();
                doc.Load(file);
                XmlElement roster = doc.DocumentElement;
                XmlNode studentToSelect = roster.SelectSingleNode("学生/学号[text()='" + textBox1.Text + "']");
                if(studentToSelect!=null){
                    XmlNode pn = studentToSelect.ParentNode;
                    if(textBox2.Text==pn.ChildNodes[1].InnerText){
                        isstudent = true;
                    }
                }
                if (isstudent)
                {
                    label1.Text = "欢迎您，" + textBox2.Text + "同学！";
                    MessageBox.Show("欢迎您，" + textBox2.Text + "同学", "欢迎");
                }
                else {
                    label1.Text = "登陆失败，学号或姓名不正确！";
                }
            }
        }
    }

登陆按钮Designer.cs

namespace work2
 {
 partial class XMLBasedLoginRegister
 {
 /// <summary>
 /// Required designer variable.
 /// </summary>
 private System.ComponentModel.IContainer components = null;
 
 /// <summary>
 /// Clean up any resources being used.
 /// </summary>
 /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
 protected override void Dispose(bool disposing)
 {
 if (disposing && (components != null))
 {
 components.Dispose();
 }
 base.Dispose(disposing);
 }
 
 #region Windows Form Designer generated code
 
 /// <summary>
 /// Required method for Designer support - do not modify
 /// the contents of this method with the code editor.
 /// </summary>
 private void InitializeComponent()
 {
 this.label1 = new System.Windows.Forms.Label();
 this.label2 = new System.Windows.Forms.Label();
 this.label3 = new System.Windows.Forms.Label();
 this.textBox1 = new System.Windows.Forms.TextBox();
 this.textBox2 = new System.Windows.Forms.TextBox();
 this.button1 = new System.Windows.Forms.Button();
 this.button2 = new System.Windows.Forms.Button();
 this.SuspendLayout();
 // 
 // label1
 // 
 this.label1.AutoSize = true;
 this.label1.Location = new System.Drawing.Point(145, 73);
 this.label1.Name = "label1";
 this.label1.Size = new System.Drawing.Size(181, 15);
 this.label1.TabIndex = 0;
 this.label1.Text = "基于XML文档的登陆与注册";
 this.label1.Click += new System.EventHandler(this.label1_Click);
 // 
 // label2
 // 
 this.label2.AutoSize = true;
 this.label2.Location = new System.Drawing.Point(37, 135);
 this.label2.Name = "label2";
 this.label2.Size = new System.Drawing.Size(52, 15);
 this.label2.TabIndex = 1;
 this.label2.Text = "学号：";
 // 
 // label3
 // 
 this.label3.AutoSize = true;
 this.label3.Location = new System.Drawing.Point(40, 216);
 this.label3.Name = "label3";
 this.label3.Size = new System.Drawing.Size(52, 15);
 this.label3.TabIndex = 2;
 this.label3.Text = "姓名：";
 // 
 // textBox1
 // 
 this.textBox1.Location = new System.Drawing.Point(123, 130);
 this.textBox1.Name = "textBox1";
 this.textBox1.Size = new System.Drawing.Size(182, 25);
 this.textBox1.TabIndex = 3;
 // 
 // textBox2
 // 
 this.textBox2.Location = new System.Drawing.Point(123, 211);
 this.textBox2.Name = "textBox2";
 this.textBox2.Size = new System.Drawing.Size(182, 25);
 this.textBox2.TabIndex = 4;
 // 
 // button1
 // 
 this.button1.Location = new System.Drawing.Point(67, 301);
 this.button1.Name = "button1";
 this.button1.Size = new System.Drawing.Size(75, 23);
 this.button1.TabIndex = 5;
 this.button1.Text = "登陆";
 this.button1.UseVisualStyleBackColor = true;
 this.button1.Click += new System.EventHandler(this.button1_Click);
 // 
 // button2
 // 
 this.button2.Location = new System.Drawing.Point(251, 301);
 this.button2.Name = "button2";
 this.button2.Size = new System.Drawing.Size(75, 23);
 this.button2.TabIndex = 6;
 this.button2.Text = "注册";
 this.button2.UseVisualStyleBackColor = true;
 this.button2.Click += new System.EventHandler(this.button2_Click);
 // 
 // XMLBasedLoginRegister
 // 
 this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 15F);
 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
 this.ClientSize = new System.Drawing.Size(481, 380);
 this.Controls.Add(this.button2);
 this.Controls.Add(this.button1);
 this.Controls.Add(this.textBox2);
 this.Controls.Add(this.textBox1);
 this.Controls.Add(this.label3);
 this.Controls.Add(this.label2);
 this.Controls.Add(this.label1);
 this.Name = "XMLBasedLoginRegister";
 this.Text = "XMLBasedLoginRegister";
 this.ResumeLayout(false);
 this.PerformLayout();
 
 }
 
 #endregion
 
 private System.Windows.Forms.Label label1;
 private System.Windows.Forms.Label label2;
 private System.Windows.Forms.Label label3;
 private System.Windows.Forms.TextBox textBox1;
 private System.Windows.Forms.TextBox textBox2;
 private System.Windows.Forms.Button button1;
 private System.Windows.Forms.Button button2;
 }
 }

实验10\_3．用C\#语言编写ASP.NET Web窗体页面，完成实验8中用JavaScript所实现的Web页面功能。如下图所示：

![Image 1][]

代码如下：

.aspx文件

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
 
 <asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
 <!DOCTYPE html>
 
 <html>
 <head >
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
 <title></title>
 </head>
 <body>
 
 <div>
 
 <asp:Label ID="Label1" runat="server" Text="实验10_ASP.NET中C#操作XML显示查询添加删除"></asp:Label>
 
 </div>
 
  
 <asp:Button ID="Button1" runat="server" Text="全部显示" OnClick="Button1_Click" />
 <asp:Button ID="Button2" runat="server" Text="显示姓名" OnClick="Button2_Click" />
 <asp:Button ID="Button3" runat="server" Text="显示属性" OnClick="Button3_Click" />
 
 <asp:Label ID="Label2" runat="server" Text="请输入学号："></asp:Label>
 <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
 
 
 <asp:Label ID="Label3" runat="server" Text="姓名："></asp:Label>
 <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
 
 <asp:Label ID="Label4" runat="server" Text="性别："></asp:Label>
 <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
 
 <asp:Label ID="Label5" runat="server" Text="专业："></asp:Label>
 <asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>
 
 <asp:Label ID="Label6" runat="server" Text="数学："></asp:Label>
 <asp:TextBox ID="TextBox5" runat="server"></asp:TextBox>
 
 <asp:Label ID="Label7" runat="server" Text="英语："></asp:Label>
 <asp:TextBox ID="TextBox6" runat="server"></asp:TextBox>
 
 <asp:Button ID="Button4" runat="server" Text="查询" OnClick="Button4_Click" />
 <asp:Button ID="Button5" runat="server" Text="添加" OnClick="Button5_Click" />
 <asp:Button ID="Button6" runat="server" Text="删除" OnClick="Button6_Click" />
 
 
 <div id="div1" runat="server" style="float:left;margin-left:400px;background-color:#ccc;margin-top:-200px;height:500px;">
 
 </div>
 </body>
 </html>
 
 </asp:Content>

aspx.cs文件

using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Web.UI;
 using System.Web.UI.WebControls;
 using System.Xml;
 
 public partial class _Default : Page
 {
 protected void Page_Load(object sender, EventArgs e)
 {
 
 }
 protected void Button1_Click(object sender, EventArgs e)
 {
 string content = "";
 string file = Server.MapPath("App_Data\\Students.xml");
 XmlDocument doc = new XmlDocument();
 doc.Load(file);
 XmlNodeList nodes = doc.DocumentElement.ChildNodes;
 for (int i = 0; i < nodes.Count; i++)
 {
 content += nodes[i].InnerText + " \r\n";
 }
 div1.InnerHtml = content;
 
 
 }
 protected void Button2_Click(object sender, EventArgs e)
 {
 string content = "";
 string file = Server.MapPath("App_Data\\Students.xml");
 XmlDocument doc = new XmlDocument();
 doc.Load(file);
 XmlNodeList nodes = doc.DocumentElement.GetElementsByTagName("姓名");
 for (int i = 0; i < nodes.Count;i++ )
 {
 content += nodes[i].InnerText + " \r\n";
 }
 div1.InnerHtml = content;
 }
 protected void Button3_Click(object sender, EventArgs e)
 {
 string content = "";
 string file = Server.MapPath("App_Data\\Students.xml");
 XmlDocument doc = new XmlDocument();
 doc.Load(file);
 var root = doc.DocumentElement;
 var studentList = root.GetElementsByTagName("姓名");
 for (int i = 0; i < studentList.Count; i++)
 {
 //content += nodes[i].InnerText + " \r\n";
 if(studentList[i].Attributes.Count==1){
 content += studentList[i].InnerText + "爱好是：" + studentList[i].Attributes[0].InnerText + " "; 
 }
 }
 if (content != "")
 {
 div1.InnerHtml = content;
 }
 else {
 div1.InnerHtml = "未找到爱好信息";
 }
 //div1.InnerHtml = content;
 }
 protected void Button4_Click(object sender, EventArgs e)
 {
 //以下是查询的代码
 div1.InnerHtml = "";
 string file = Server.MapPath("App_Data\\Students.xml");
 XmlDocument doc = new XmlDocument();
 doc.Load(file);
 XmlElement root = doc.DocumentElement;
 XmlNode studentToSelect = root.SelectSingleNode("学生/学号[text()='"+TextBox1.Text+"']");
 if(studentToSelect!=null){
 XmlNode pn = studentToSelect.ParentNode;
 try {
 TextBox1.Text = pn.ChildNodes[0].InnerText;
 TextBox2.Text = pn.ChildNodes[1].InnerText;
 TextBox3.Text = pn.ChildNodes[2].InnerText;
 TextBox4.Text = pn.ChildNodes[3].InnerText;
 TextBox5.Text = pn.ChildNodes[4].InnerText;
 TextBox6.Text = pn.ChildNodes[5].InnerText;
 foreach(XmlNode xn in pn.ChildNodes){
 div1.InnerHtml += xn.InnerText + "";
 Label1.Text = "查询完毕，找到了！";
 }
 }catch{
 Label1.Text="该同学数据不完整";
 }
 }
 else{
 Label1.Text="未找到符合条件的记录";
 }
 }
 protected void Button5_Click(object sender, EventArgs e)
 {
 if((TextBox1.Text=="")||(TextBox2.Text=="")){
 Label1.Text = "学号姓名不能未空！";
 return;
 }
 string XMLFileName = Server.MapPath("App_Data\\Students.xml");
 XmlDocument doc = new XmlDocument();
 doc.Load(XMLFileName);
 XmlElement root = doc.DocumentElement;
 XmlNode studentToSelect = root.SelectSingleNode("学生/学号[text()='" + TextBox1.Text + "']");
 if(studentToSelect!=null){
 Label1.Text = "学号已存在，学生之间学号不能相同，未执行添加！";
 return;
 }
 XmlElement student = doc.CreateElement("学生");
 doc.DocumentElement.AppendChild(student);
 XmlElement number = doc.CreateElement("学号");
 number.InnerText = TextBox1.Text;
 student.AppendChild(number);
 XmlElement name = doc.CreateElement("姓名");
 name.InnerText = TextBox2.Text;
 student.AppendChild(name);
 XmlElement sex = doc.CreateElement("性别");
 sex.InnerText = TextBox3.Text;
 student.AppendChild(sex);
 XmlElement major = doc.CreateElement("专业");
 major.InnerText = TextBox4.Text;
 student.AppendChild(major);
 
 XmlElement math = doc.CreateElement("数学");
 math.InnerText = TextBox5.Text;
 student.AppendChild(math);
 
 XmlElement English = doc.CreateElement("英语");
 English.InnerText = TextBox6.Text;
 student.AppendChild(English);
 
 
 doc.Save(XMLFileName);
 Label1.Text = "成功添加！";
 }
 protected void Button6_Click(object sender, EventArgs e)
 {
 string file = Server.MapPath("App_Data\\Students.xml");
 XmlDocument doc = new XmlDocument();
 doc.Load(file);
 XmlElement roster = doc.DocumentElement;
 XmlNode studentToSelect = roster.SelectSingleNode("学生/学号[text()='" + TextBox1.Text + "']");
 if (studentToSelect != null)
 {
 XmlNode pn = studentToSelect.ParentNode;
 roster.RemoveChild(pn);
 doc.Save(file);
 Label1.Text = "成功删除!";
 TextBox2.Text = "";
 TextBox3.Text = "";
 TextBox4.Text = "";
 TextBox5.Text = "";
 TextBox6.Text = "";
 }
 else {
 Label1.Text = "不能删除，无此记录!";
 }
 }
 }

程序结果如图：

显示姓名：

![Image 1][]

显示爱好属性

![Image 1][]

全部显示

![Image 1][]

登陆成功

![Image 1][]

成功查询：

![Image 1][]

没有此记录，不能删除