C#实现利用Linq操作Xml文件

实践过程

效果

代码

public partial class Form1 : Form
{
   public Form1()
   {
       InitializeComponent();
   }

static string strPath = "Employee.xml";
   static string strID = "";

//窗体加载时加载XML文件
   private void Form1_Load(object sender, EventArgs e)
   {
       if (File.Exists(strPath))
       {
           groupBox1.Enabled = false;
           getXmlInfo();
       }
       else
           groupBox1.Enabled = true;
   }

//创建XML文件
   private void button1_Click(object sender, EventArgs e)
   {
       XDocument doc = new XDocument(
           new XDeclaration("1.0", "utf-8", "yes"),
           new XElement(textBox1.Text,
               new XElement(textBox2.Text, new XAttribute(textBox3.Text, textBox10.Text),
                   new XElement(textBox4.Text, textBox5.Text),
                   new XElement(textBox6.Text, textBox7.Text),
                   new XElement(textBox8.Text, textBox9.Text))
               )
           );
       doc.Save(strPath);
       groupBox1.Enabled = false;
       getXmlInfo();
   }

//添加XML元素
   private void button2_Click(object sender, EventArgs e)
   {
       XElement xe = XElement.Load(strPath);
       IEnumerable<XElement> elements1 = from element in xe.Elements("People")
                                         select element;
       //生成新的编号
       string str = (Convert.ToInt32(elements1.Max(element => element.Attribute("ID").Value)) + 1).ToString("000");
       XElement people = new XElement(
           "People", new XAttribute("ID", str),
           new XElement("Name", textBox11.Text),
           new XElement("Sex", comboBox1.Text),
           new XElement("Salary", textBox12.Text)
           );
       xe.Add(people);
       xe.Save(strPath);
       getXmlInfo();
   }

//修改XML元素
   private void button3_Click(object sender, EventArgs e)
   {
       if (strID != "")
       {
           XElement xe = XElement.Load(strPath);
           IEnumerable<XElement> elements = from element in xe.Elements("People")
                                            where element.Attribute("ID").Value == strID
                                            select element;
           if (elements.Count() > 0)
           {
               XElement newXE = elements.First();
               newXE.SetAttributeValue("ID", strID);
               newXE.ReplaceNodes(
                   new XElement("Name", textBox11.Text),
                   new XElement("Sex", comboBox1.Text),
                   new XElement("Salary", textBox12.Text)
                   );
           }
           xe.Save(strPath);
       }
       getXmlInfo();
   }

//删除XML元素
   private void button4_Click(object sender, EventArgs e)
   {
       if (strID != "")
       {
           XElement xe = XElement.Load(strPath);
           IEnumerable<XElement> elements = from element in xe.Elements("People")
                                            where element.Attribute("ID").Value == strID
                                            select element;
           if (elements.Count() > 0)
               elements.First().Remove();
           xe.Save(strPath);
       }
       getXmlInfo();
   }

//显示选中XML节点的详细信息
   private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
   {
       strID = dataGridView1.Rows[e.RowIndex].Cells[3].Value.ToString();
       XElement xe = XElement.Load(strPath);
       IEnumerable<XElement> elements = from PInfo in xe.Elements("People")
                                        where PInfo.Attribute("ID").Value == strID
                                        select PInfo;
       foreach (XElement element in elements)
       {
           textBox11.Text = element.Element("Name").Value;
           comboBox1.SelectedItem = element.Element("Sex").Value;
           textBox12.Text = element.Element("Salary").Value;
       }
   }

#region 将XML文件内容绑定到DataGridView控件
   /// <summary>
   /// 将XML文件内容绑定到DataGridView控件
   /// </summary>
   private void getXmlInfo()
   {
       DataSet myds = new DataSet();
       myds.ReadXml(strPath);
       dataGridView1.DataSource = myds.Tables[0];
   }
   #endregion
}

partial class Form1
{
   /// <summary>
   /// 必需的设计器变量。
   /// </summary>
   private System.ComponentModel.IContainer components = null;

/// <summary>
   /// 清理所有正在使用的资源。
   /// </summary>
   /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
   protected override void Dispose(bool disposing)
   {
       if (disposing && (components != null))
       {
           components.Dispose();
       }
       base.Dispose(disposing);
   }

#region Windows 窗体设计器生成的代码

/// <summary>
   /// 设计器支持所需的方法 - 不要
   /// 使用代码编辑器修改此方法的内容。
   /// </summary>
   private void InitializeComponent()
   {
       this.groupBox1 = new System.Windows.Forms.GroupBox();
       this.textBox10 = new System.Windows.Forms.TextBox();
       this.label10 = new System.Windows.Forms.Label();
       this.button1 = new System.Windows.Forms.Button();
       this.textBox9 = new System.Windows.Forms.TextBox();
       this.label8 = new System.Windows.Forms.Label();
       this.textBox8 = new System.Windows.Forms.TextBox();
       this.label9 = new System.Windows.Forms.Label();
       this.textBox7 = new System.Windows.Forms.TextBox();
       this.label2 = new System.Windows.Forms.Label();
       this.textBox6 = new System.Windows.Forms.TextBox();
       this.label7 = new System.Windows.Forms.Label();
       this.textBox5 = new System.Windows.Forms.TextBox();
       this.label5 = new System.Windows.Forms.Label();
       this.textBox4 = new System.Windows.Forms.TextBox();
       this.label6 = new System.Windows.Forms.Label();
       this.textBox3 = new System.Windows.Forms.TextBox();
       this.label3 = new System.Windows.Forms.Label();
       this.textBox2 = new System.Windows.Forms.TextBox();
       this.label4 = new System.Windows.Forms.Label();
       this.textBox1 = new System.Windows.Forms.TextBox();
       this.label1 = new System.Windows.Forms.Label();
       this.groupBox2 = new System.Windows.Forms.GroupBox();
       this.button4 = new System.Windows.Forms.Button();
       this.button3 = new System.Windows.Forms.Button();
       this.button2 = new System.Windows.Forms.Button();
       this.comboBox1 = new System.Windows.Forms.ComboBox();
       this.textBox12 = new System.Windows.Forms.TextBox();
       this.label12 = new System.Windows.Forms.Label();
       this.label13 = new System.Windows.Forms.Label();
       this.textBox11 = new System.Windows.Forms.TextBox();
       this.label14 = new System.Windows.Forms.Label();
       this.dataGridView1 = new System.Windows.Forms.DataGridView();
       this.groupBox1.SuspendLayout();
       this.groupBox2.SuspendLayout();
       ((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).BeginInit();
       this.SuspendLayout();
       //
       // groupBox1
       //
       this.groupBox1.Controls.Add(this.textBox10);
       this.groupBox1.Controls.Add(this.label10);
       this.groupBox1.Controls.Add(this.button1);
       this.groupBox1.Controls.Add(this.textBox9);
       this.groupBox1.Controls.Add(this.label8);
       this.groupBox1.Controls.Add(this.textBox8);
       this.groupBox1.Controls.Add(this.label9);
       this.groupBox1.Controls.Add(this.textBox7);
       this.groupBox1.Controls.Add(this.label2);
       this.groupBox1.Controls.Add(this.textBox6);
       this.groupBox1.Controls.Add(this.label7);
       this.groupBox1.Controls.Add(this.textBox5);
       this.groupBox1.Controls.Add(this.label5);
       this.groupBox1.Controls.Add(this.textBox4);
       this.groupBox1.Controls.Add(this.label6);
       this.groupBox1.Controls.Add(this.textBox3);
       this.groupBox1.Controls.Add(this.label3);
       this.groupBox1.Controls.Add(this.textBox2);
       this.groupBox1.Controls.Add(this.label4);
       this.groupBox1.Controls.Add(this.textBox1);
       this.groupBox1.Controls.Add(this.label1);
       this.groupBox1.Location = new System.Drawing.Point(6, 3);
       this.groupBox1.Name = "groupBox1";
       this.groupBox1.Size = new System.Drawing.Size(451, 190);
       this.groupBox1.TabIndex = 18;
       this.groupBox1.TabStop = false;
       this.groupBox1.Text = "创建XML文件";
       //
       // textBox10
       //
       this.textBox10.Location = new System.Drawing.Point(319, 47);
       this.textBox10.Name = "textBox10";
       this.textBox10.ReadOnly = true;
       this.textBox10.Size = new System.Drawing.Size(119, 21);
       this.textBox10.TabIndex = 3;
       this.textBox10.Text = "001";
       //
       // label10
       //
       this.label10.AutoSize = true;
       this.label10.Location = new System.Drawing.Point(236, 50);
       this.label10.Name = "label10";
       this.label10.Size = new System.Drawing.Size(89, 12);
       this.label10.TabIndex = 21;
       this.label10.Text = "子节点属性值：";
       //
       // button1
       //
       this.button1.Location = new System.Drawing.Point(363, 158);
       this.button1.Name = "button1";
       this.button1.Size = new System.Drawing.Size(75, 23);
       this.button1.TabIndex = 10;
       this.button1.Text = "创建";
       this.button1.UseVisualStyleBackColor = true;
       this.button1.Click += new System.EventHandler(this.button1_Click);
       //
       // textBox9
       //
       this.textBox9.Location = new System.Drawing.Point(319, 131);
       this.textBox9.Name = "textBox9";
       this.textBox9.Size = new System.Drawing.Size(119, 21);
       this.textBox9.TabIndex = 9;
       //
       // label8
       //
       this.label8.AutoSize = true;
       this.label8.Location = new System.Drawing.Point(236, 134);
       this.label8.Name = "label8";
       this.label8.Size = new System.Drawing.Size(89, 12);
       this.label8.TabIndex = 18;
       this.label8.Text = "第三个元素值：";
       //
       // textBox8
       //
       this.textBox8.Location = new System.Drawing.Point(111, 131);
       this.textBox8.Name = "textBox8";
       this.textBox8.ReadOnly = true;
       this.textBox8.Size = new System.Drawing.Size(119, 21);
       this.textBox8.TabIndex = 8;
       this.textBox8.Text = "Salary";
       //
       // label9
       //
       this.label9.AutoSize = true;
       this.label9.Location = new System.Drawing.Point(12, 134);
       this.label9.Name = "label9";
       this.label9.Size = new System.Drawing.Size(101, 12);
       this.label9.TabIndex = 16;
       this.label9.Text = "第三个元素名称：";
       //
       // textBox7
       //
       this.textBox7.Location = new System.Drawing.Point(319, 103);
       this.textBox7.Name = "textBox7";
       this.textBox7.Size = new System.Drawing.Size(119, 21);
       this.textBox7.TabIndex = 7;
       //
       // label2
       //
       this.label2.AutoSize = true;
       this.label2.Location = new System.Drawing.Point(236, 106);
       this.label2.Name = "label2";
       this.label2.Size = new System.Drawing.Size(89, 12);
       this.label2.TabIndex = 14;
       this.label2.Text = "第二个元素值：";
       //
       // textBox6
       //
       this.textBox6.Location = new System.Drawing.Point(111, 103);
       this.textBox6.Name = "textBox6";
       this.textBox6.ReadOnly = true;
       this.textBox6.Size = new System.Drawing.Size(119, 21);
       this.textBox6.TabIndex = 6;
       this.textBox6.Text = "Sex";
       //
       // label7
       //
       this.label7.AutoSize = true;
       this.label7.Location = new System.Drawing.Point(12, 106);
       this.label7.Name = "label7";
       this.label7.Size = new System.Drawing.Size(101, 12);
       this.label7.TabIndex = 12;
       this.label7.Text = "第二个元素名称：";
       //
       // textBox5
       //
       this.textBox5.Location = new System.Drawing.Point(319, 75);
       this.textBox5.Name = "textBox5";
       this.textBox5.Size = new System.Drawing.Size(119, 21);
       this.textBox5.TabIndex = 5;
       //
       // label5
       //
       this.label5.AutoSize = true;
       this.label5.Location = new System.Drawing.Point(236, 78);
       this.label5.Name = "label5";
       this.label5.Size = new System.Drawing.Size(89, 12);
       this.label5.TabIndex = 10;
       this.label5.Text = "第一个元素值：";
       //
       // textBox4
       //
       this.textBox4.Location = new System.Drawing.Point(111, 75);
       this.textBox4.Name = "textBox4";
       this.textBox4.ReadOnly = true;
       this.textBox4.Size = new System.Drawing.Size(119, 21);
       this.textBox4.TabIndex = 4;
       this.textBox4.Text = "Name";
       //
       // label6
       //
       this.label6.AutoSize = true;
       this.label6.Location = new System.Drawing.Point(12, 78);
       this.label6.Name = "label6";
       this.label6.Size = new System.Drawing.Size(101, 12);
       this.label6.TabIndex = 8;
       this.label6.Text = "第一个元素名称：";
       //
       // textBox3
       //
       this.textBox3.Location = new System.Drawing.Point(111, 47);
       this.textBox3.Name = "textBox3";
       this.textBox3.ReadOnly = true;
       this.textBox3.Size = new System.Drawing.Size(119, 21);
       this.textBox3.TabIndex = 2;
       this.textBox3.Text = "ID";
       //
       // label3
       //
       this.label3.AutoSize = true;
       this.label3.Location = new System.Drawing.Point(28, 50);
       this.label3.Name = "label3";
       this.label3.Size = new System.Drawing.Size(77, 12);
       this.label3.TabIndex = 6;
       this.label3.Text = "子节点属性：";
       //
       // textBox2
       //
       this.textBox2.Location = new System.Drawing.Point(319, 20);
       this.textBox2.Name = "textBox2";
       this.textBox2.ReadOnly = true;
       this.textBox2.Size = new System.Drawing.Size(119, 21);
       this.textBox2.TabIndex = 1;
       this.textBox2.Text = "People";
       //
       // label4
       //
       this.label4.AutoSize = true;
       this.label4.Location = new System.Drawing.Point(248, 23);
       this.label4.Name = "label4";
       this.label4.Size = new System.Drawing.Size(77, 12);
       this.label4.TabIndex = 4;
       this.label4.Text = "子节点名称：";
       //
       // textBox1
       //
       this.textBox1.Location = new System.Drawing.Point(111, 20);
       this.textBox1.Name = "textBox1";
       this.textBox1.ReadOnly = true;
       this.textBox1.Size = new System.Drawing.Size(119, 21);
       this.textBox1.TabIndex = 0;
       this.textBox1.Text = "Peoples";
       //
       // label1
       //
       this.label1.AutoSize = true;
       this.label1.Location = new System.Drawing.Point(19, 23);
       this.label1.Name = "label1";
       this.label1.Size = new System.Drawing.Size(89, 12);
       this.label1.TabIndex = 0;
       this.label1.Text = "顶级节点名称：";
       //
       // groupBox2
       //
       this.groupBox2.Controls.Add(this.button4);
       this.groupBox2.Controls.Add(this.button3);
       this.groupBox2.Controls.Add(this.button2);
       this.groupBox2.Controls.Add(this.comboBox1);
       this.groupBox2.Controls.Add(this.textBox12);
       this.groupBox2.Controls.Add(this.label12);
       this.groupBox2.Controls.Add(this.label13);
       this.groupBox2.Controls.Add(this.textBox11);
       this.groupBox2.Controls.Add(this.label14);
       this.groupBox2.Location = new System.Drawing.Point(6, 198);
       this.groupBox2.Name = "groupBox2";
       this.groupBox2.Size = new System.Drawing.Size(451, 80);
       this.groupBox2.TabIndex = 19;
       this.groupBox2.TabStop = false;
       this.groupBox2.Text = "操作XML文件";
       //
       // button4
       //
       this.button4.Location = new System.Drawing.Point(360, 47);
       this.button4.Name = "button4";
       this.button4.Size = new System.Drawing.Size(63, 23);
       this.button4.TabIndex = 16;
       this.button4.Text = "删除";
       this.button4.UseVisualStyleBackColor = true;
       this.button4.Click += new System.EventHandler(this.button4_Click);
       //
       // button3
       //
       this.button3.Location = new System.Drawing.Point(291, 47);
       this.button3.Name = "button3";
       this.button3.Size = new System.Drawing.Size(63, 23);
       this.button3.TabIndex = 15;
       this.button3.Text = "修改";
       this.button3.UseVisualStyleBackColor = true;
       this.button3.Click += new System.EventHandler(this.button3_Click);
       //
       // button2
       //
       this.button2.Location = new System.Drawing.Point(222, 47);
       this.button2.Name = "button2";
       this.button2.Size = new System.Drawing.Size(63, 23);
       this.button2.TabIndex = 14;
       this.button2.Text = "添加";
       this.button2.UseVisualStyleBackColor = true;
       this.button2.Click += new System.EventHandler(this.button2_Click);
       //
       // comboBox1
       //
       this.comboBox1.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
       this.comboBox1.FormattingEnabled = true;
       this.comboBox1.Items.AddRange(new object[] {
       "男",
       "女"});
       this.comboBox1.Location = new System.Drawing.Point(286, 20);
       this.comboBox1.Name = "comboBox1";
       this.comboBox1.Size = new System.Drawing.Size(121, 20);
       this.comboBox1.TabIndex = 12;
       //
       // textBox12
       //
       this.textBox12.Location = new System.Drawing.Point(85, 49);
       this.textBox12.Name = "textBox12";
       this.textBox12.Size = new System.Drawing.Size(119, 21);
       this.textBox12.TabIndex = 13;
       //
       // label12
       //
       this.label12.AutoSize = true;
       this.label12.Location = new System.Drawing.Point(19, 52);
       this.label12.Name = "label12";
       this.label12.Size = new System.Drawing.Size(65, 12);
       this.label12.TabIndex = 27;
       this.label12.Text = "职工薪水：";
       //
       // label13
       //
       this.label13.AutoSize = true;
       this.label13.Location = new System.Drawing.Point(220, 23);
       this.label13.Name = "label13";
       this.label13.Size = new System.Drawing.Size(65, 12);
       this.label13.TabIndex = 25;
       this.label13.Text = "职工性别：";
       //
       // textBox11
       //
       this.textBox11.Location = new System.Drawing.Point(85, 20);
       this.textBox11.Name = "textBox11";
       this.textBox11.Size = new System.Drawing.Size(119, 21);
       this.textBox11.TabIndex = 11;
       //
       // label14
       //
       this.label14.AutoSize = true;
       this.label14.Location = new System.Drawing.Point(19, 23);
       this.label14.Name = "label14";
       this.label14.Size = new System.Drawing.Size(65, 12);
       this.label14.TabIndex = 23;
       this.label14.Text = "职工姓名：";
       //
       // dataGridView1
       //
       this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
       this.dataGridView1.Location = new System.Drawing.Point(6, 284);
       this.dataGridView1.Name = "dataGridView1";
       this.dataGridView1.RowTemplate.Height = 23;
       this.dataGridView1.Size = new System.Drawing.Size(451, 171);
       this.dataGridView1.TabIndex = 17;
       this.dataGridView1.CellClick += new System.Windows.Forms.DataGridViewCellEventHandler(this.dataGridView1_CellClick);
       //
       // Form1
       //
       this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
       this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
       this.ClientSize = new System.Drawing.Size(462, 460);
       this.Controls.Add(this.dataGridView1);
       this.Controls.Add(this.groupBox2);
       this.Controls.Add(this.groupBox1);
       this.Name = "Form1";
       this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
       this.Text = "使用Linq To XML操作XML文件";
       this.Load += new System.EventHandler(this.Form1_Load);
       this.groupBox1.ResumeLayout(false);
       this.groupBox1.PerformLayout();
       this.groupBox2.ResumeLayout(false);
       this.groupBox2.PerformLayout();
       ((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).EndInit();
       this.ResumeLayout(false);

}

#endregion

private System.Windows.Forms.GroupBox groupBox1;
   private System.Windows.Forms.Label label1;
   private System.Windows.Forms.TextBox textBox5;
   private System.Windows.Forms.Label label5;
   private System.Windows.Forms.TextBox textBox4;
   private System.Windows.Forms.Label label6;
   private System.Windows.Forms.TextBox textBox3;
   private System.Windows.Forms.Label label3;
   private System.Windows.Forms.TextBox textBox2;
   private System.Windows.Forms.Label label4;
   private System.Windows.Forms.TextBox textBox1;
   private System.Windows.Forms.TextBox textBox7;
   private System.Windows.Forms.Label label2;
   private System.Windows.Forms.TextBox textBox6;
   private System.Windows.Forms.Label label7;
   private System.Windows.Forms.TextBox textBox9;
   private System.Windows.Forms.Label label8;
   private System.Windows.Forms.TextBox textBox8;
   private System.Windows.Forms.Label label9;
   private System.Windows.Forms.Button button1;
   private System.Windows.Forms.TextBox textBox10;
   private System.Windows.Forms.Label label10;
   private System.Windows.Forms.GroupBox groupBox2;
   private System.Windows.Forms.DataGridView dataGridView1;
   private System.Windows.Forms.TextBox textBox12;
   private System.Windows.Forms.Label label12;
   private System.Windows.Forms.Label label13;
   private System.Windows.Forms.TextBox textBox11;
   private System.Windows.Forms.Label label14;
   private System.Windows.Forms.ComboBox comboBox1;
   private System.Windows.Forms.Button button4;
   private System.Windows.Forms.Button button3;
   private System.Windows.Forms.Button button2;
}

来源：https://blog.csdn.net/qq_27489007/article/details/128365644