XML文件的一些操作

XML 是被设计用来传输和存储数据的,

XML 必须含有且仅有一个根节点元素(没有根节点会报错)

源码下载 http://pan.baidu.com/s/1ge2lpM7

好了,我们先看一个 XML 文件(Cartoon.xml)

<?xml version="1.0" encoding="utf-8"?>

<Cartoon>

  <Character Company="DC">

    <Name>超人</Name>

    <Age></Age>

  </Character>

  <Character Company="Marve">

    <Name>雷神</Name>

    <Age></Age>

  </Character>

</Cartoon>

第二个 XML 文件 (Attribute.xml)

<?xml version="1.0" encoding="utf-8"?>

<Cartoon>

  <Character Name="超人" Company="DC" Age="" />

  <Character Name="雷神" Company="Marve" Age="" />

</Cartoon>

既然是小型存储文件,就避免不了增删改查.

全部方法代码如下 (用了两种方法 增删改查).

using System;

using System.IO;

using System.Linq;

using System.Windows.Forms;

using System.Xml;

using System.Xml.Linq;

namespace XML_Demo

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        //创建XML

        private void btn_Create_XML_Click(object sender, EventArgs e)

        {

            XmlDocument doc = new XmlDocument();

            XmlDeclaration describe = doc.CreateXmlDeclaration("1.0", "utf-8", null); // 创建 描述信息

            doc.AppendChild(describe); // 写入描述

            XmlElement cartoon = doc.CreateElement("Cartoon"); //创建根节点

            doc.AppendChild(cartoon); // 写入根节点

            //子节点1

            XmlElement character1 = doc.CreateElement("Character");

            character1.SetAttribute("Company", "DC");

            XmlElement name1 = doc.CreateElement("Name");

            name1.InnerText = "超人";

            character1.AppendChild(name1);

            XmlElement age1 = doc.CreateElement("Age");

            age1.InnerText = "";

            character1.AppendChild(age1);

            cartoon.AppendChild(character1); //子节点写入根节点

            //子节点2

            XmlElement character2 = doc.CreateElement("Character");

            character2.SetAttribute("Company", "Marve");

            XmlElement name2 = doc.CreateElement("Name");

            name2.InnerText = "雷神";

            character2.AppendChild(name2);

            XmlElement age2 = doc.CreateElement("Age");

            age2.InnerText = "";

            character2.AppendChild(age2);

            cartoon.AppendChild(character2); //子节点写入根节点

            doc.Save(@"C:\Cartoon.xml");

            Console.WriteLine("写入成功!");

        }

        //查询XML

        private void btn_Search_Click(object sender, EventArgs e)

        {

            XmlDocument doc = new XmlDocument();

            doc.Load(@"C:\Cartoon.xml");

            //获取根节点

            XmlElement superHeroes = doc.DocumentElement;

            // 获取子节点的集合

            XmlNodeList heroes = superHeroes.ChildNodes;

            foreach (XmlNode hero in heroes)

            {

                Console.WriteLine(hero.SelectSingleNode("Name").InnerText + ":" +

                                  hero.SelectSingleNode("Age").InnerText);

            }

        }

        //修改XML

        private void btn_Edit_Click(object sender, EventArgs e)

        {

            XmlDocument doc = new XmlDocument();

            var file = @"C:\Cartoon.xml";

            if (File.Exists(file))

            {

                doc.Load(file);

                //获取根节点

                XmlNode root = doc.DocumentElement;

                //获取节点的所有子节点

                XmlNodeList characters = root.ChildNodes;

                foreach (XmlNode hero in characters)

                {

                    string node = hero.SelectSingleNode("Name").InnerText;

                    if (node == "超人")

                    {

                        XmlNode age = hero.SelectSingleNode("Age");

                        age.InnerText = "";

                        doc.Save(file);

                        Console.WriteLine("修改成功!");

                    }

                }

            }

            else

            {

                Console.WriteLine("文件不存在!");

            }

        }

        //修改XML(追加)

        private void btn_Edit_Add_Click(object sender, EventArgs e)

        {

            XmlDocument doc = new XmlDocument();

            var file = @"C:\Cartoon.xml";

            if (File.Exists(file))

            {

                doc.Load(file);

                //获取根节点

                XmlElement cartoonNew = doc.DocumentElement;

                XmlElement characterNew = doc.CreateElement("Character");

                characterNew.SetAttribute("Company", "DC");

                XmlElement nameNew = doc.CreateElement("Name");

                nameNew.InnerText = "Doctor Manhattan";

                characterNew.AppendChild(nameNew);

                XmlElement ageNew = doc.CreateElement("Age");

                ageNew.InnerText = "";

                characterNew.AppendChild(ageNew);

                cartoonNew.AppendChild(characterNew); //子节点写入根节点

                doc.Save(file);

                Console.WriteLine("添加成功!");

            }

            else

            {

                Console.WriteLine("文件不存在!");

            }

        }

        //删除XML

        private void btn_Del_Click(object sender, EventArgs e)

        {

            XmlDocument doc = new XmlDocument();

            var file = @"C:\Cartoon.xml";

            doc.Load(file);

            XmlNode root = doc.SelectSingleNode("Cartoon");

            //root.RemoveAll(); //删除根节点下的 所有节点

            foreach (XmlNode xn in root.ChildNodes)

            {

                if (xn.FirstChild.InnerText == "超人")

                {

                    root.RemoveChild(xn);

                }

            }

            doc.Save(file);

            Console.WriteLine("删除成功");

        }

        //创建XML2

        private void btn_Create_XML2_Click(object sender, EventArgs e)

        {

            XElement xel = new XElement("Cartoon",

                new XElement("Character",

                    new XAttribute("Company", "DC"),

                    new XElement("Name", "超人"),

                    new XElement("Age", "")),

                new XElement("Character",

                    new XAttribute("Company", "Marve"),

                    new XElement("Name", "雷神"),

                    new XElement("Age", ""))

            );

            XDocument xdoc = new XDocument(xel);

            xdoc.Save(@"c:\Cartoon2.xml");

        }

        //查询XML2

        private void btn_Search2_Click(object sender, EventArgs e)

        {

            XmlDocument doc = new XmlDocument();

            doc.Load(@"C:\Cartoon2.xml");

            XmlNodeList characterList = doc.SelectNodes("/Character");

            foreach (XmlNode item in characterList)

            {

                Console.WriteLine(item.SelectSingleNode("Name").InnerText+":"+

                                  item.SelectSingleNode("Age").InnerText);

            }

        }

        //修改XML2

        private void btn_Edit2_Click(object sender, EventArgs e)

        {

            XElement doc = XElement.Load(@"C:\Cartoon2.xml");

            XElement heroes = (from p in doc.Elements() where p.Element("Name").Value == "超人" select p).FirstOrDefault();

            if (heroes != null)

            {

                heroes.Element("Age").Value = "";

                doc.Save(@"C:\Cartoon2.xml");

                Console.WriteLine("添加成功!");

            }

        }

        //删除XML2

        private void btn_Del2_Click(object sender, EventArgs e)

        {

            XElement doc = XElement.Load(@"C:\Cartoon2.xml");

            XElement xchild = doc.Descendants("Name").Single(p => p.Value.Equals("超人"));

            XElement nameNode = xchild.Parent;

            nameNode.Remove();

            doc.Save(@"C:\Cartoon2.xml");

        }

        //创建多属性XML

        private void btn_XML_Attribute_Click(object sender, EventArgs e)

        {

            XmlDocument doc = new XmlDocument();

            XmlDeclaration describe = doc.CreateXmlDeclaration("1.0", "utf-8", null);

            doc.AppendChild(describe);

            XmlElement cartoon = doc.CreateElement("Cartoon");

            doc.AppendChild(cartoon);

            XmlElement character1 = doc.CreateElement("Character");

            character1.SetAttribute("Name", "超人");

            character1.SetAttribute("Company","DC");

            character1.SetAttribute("Age", "");

            cartoon.AppendChild(character1);

            XmlElement character2 = doc.CreateElement("Character");

            character2.SetAttribute("Name", "雷神");

            character2.SetAttribute("Company", "Marve");

            character2.SetAttribute("Age", "");

            cartoon.AppendChild(character2);

            doc.Save(@"C:\Attribute.xml");

            Console.WriteLine("写入成功!");

        }

        //查询多属性XML

        private void btn_Search_Attribute_Click(object sender, EventArgs e)

        {

            var file = @"C:\Attribute.xml";

            XmlDocument doc = new XmlDocument();

            doc.Load(file);

            XmlNodeList xnl = doc.SelectNodes("/Cartoon/Character");

            foreach (XmlNode item in xnl)

            {

                Console.WriteLine(item.Attributes["Name"].Value );

            }

        }

        //修改多属性XML

        private void btn_Edit_Attribute_Click(object sender, EventArgs e)

        {

            var file = @"C:\Attribute.xml";

            XElement doc = XElement.Load(file);

            XElement heroes = (from p in doc.Elements() where p.Attribute("Name").Value == "超人" select p).FirstOrDefault();

            if (heroes != null)

            {

                heroes.Attribute("Age").Value = "";

                doc.Save(file);

                Console.WriteLine("修改成功!");

            }

        }

        //删除多属性XML

        private void btn_Del_Attribute_Click(object sender, EventArgs e)

        {

            var file = @"C:\Attribute.xml";

            XElement xl = XDocument.Load(file).Root;

            xl.Elements("Character").Where(el => el.Attribute("Name").Value.Equals("超人")).Remove();

            xl.Save(file);

            Console.WriteLine("修改成功!");

        }

        //删除多属性XML2

        private void btn_Del_Attribute2_Click(object sender, EventArgs e)

        {

            var file = @"C:\Attribute.xml";

            XmlDocument doc = new XmlDocument();

            doc.Load(file);

            XmlElement root = doc.DocumentElement;

            XmlNodeList element = doc.SelectNodes("/Cartoon/Character");

            foreach (XmlNode item in element)

            {

                Console.WriteLine(item.Attributes["Name"].Value);

                if (item.Attributes["Name"].Value == "超人")

                {

                    root.RemoveChild(item);

                }

            }

            doc.Save(file);

        }

    }

}

窗体设计代码 (如果不想拖控件,可以复制过去)

 namespace XML_Demo

 {

     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 - 不要修改

         /// 使用代码编辑器修改此方法的内容。

         /// </summary>

         private void InitializeComponent()

         {

             this.btn_Create_XML = new System.Windows.Forms.Button();

             this.btn_Create_XML2 = new System.Windows.Forms.Button();

             this.btn_Search = new System.Windows.Forms.Button();

             this.btn_Edit_Add = new System.Windows.Forms.Button();

             this.btn_Edit = new System.Windows.Forms.Button();

             this.btn_Del = new System.Windows.Forms.Button();

             this.btn_Search2 = new System.Windows.Forms.Button();

             this.btn_Edit2 = new System.Windows.Forms.Button();

             this.btn_Del2 = new System.Windows.Forms.Button();

             this.btn_XML_Attribute = new System.Windows.Forms.Button();

             this.btn_Search_Attribute = new System.Windows.Forms.Button();

             this.btn_Edit_Attribute = new System.Windows.Forms.Button();

             this.btn_Del_Attribute = new System.Windows.Forms.Button();

             this.btn_Del_Attribute2 = new System.Windows.Forms.Button();

             this.SuspendLayout();

             //

             // btn_Create_XML

             //

             this.btn_Create_XML.Location = new System.Drawing.Point(, );

             this.btn_Create_XML.Name = "btn_Create_XML";

             this.btn_Create_XML.Size = new System.Drawing.Size(, );

             this.btn_Create_XML.TabIndex = ;

             this.btn_Create_XML.Text = "创建XML";

             this.btn_Create_XML.UseVisualStyleBackColor = true;

             this.btn_Create_XML.Click += new System.EventHandler(this.btn_Create_XML_Click);

             //

             // btn_Create_XML2

             //

             this.btn_Create_XML2.Location = new System.Drawing.Point(, );

             this.btn_Create_XML2.Name = "btn_Create_XML2";

             this.btn_Create_XML2.Size = new System.Drawing.Size(, );

             this.btn_Create_XML2.TabIndex = ;

             this.btn_Create_XML2.Text = "创建XML2";

             this.btn_Create_XML2.UseVisualStyleBackColor = true;

             this.btn_Create_XML2.Click += new System.EventHandler(this.btn_Create_XML2_Click);

             //

             // btn_Search

             //

             this.btn_Search.Location = new System.Drawing.Point(, );

             this.btn_Search.Name = "btn_Search";

             this.btn_Search.Size = new System.Drawing.Size(, );

             this.btn_Search.TabIndex = ;

             this.btn_Search.Text = "查询XML";

             this.btn_Search.UseVisualStyleBackColor = true;

             this.btn_Search.Click += new System.EventHandler(this.btn_Search_Click);

             //

             // btn_Edit_Add

             //

             this.btn_Edit_Add.Location = new System.Drawing.Point(, );

             this.btn_Edit_Add.Name = "btn_Edit_Add";

             this.btn_Edit_Add.Size = new System.Drawing.Size(, );

             this.btn_Edit_Add.TabIndex = ;

             this.btn_Edit_Add.Text = "修改XML(追加)";

             this.btn_Edit_Add.UseVisualStyleBackColor = true;

             this.btn_Edit_Add.Click += new System.EventHandler(this.btn_Edit_Add_Click);

             //

             // btn_Edit

             //

             this.btn_Edit.Location = new System.Drawing.Point(, );

             this.btn_Edit.Name = "btn_Edit";

             this.btn_Edit.Size = new System.Drawing.Size(, );

             this.btn_Edit.TabIndex = ;

             this.btn_Edit.Text = "修改XML";

             this.btn_Edit.UseVisualStyleBackColor = true;

             this.btn_Edit.Click += new System.EventHandler(this.btn_Edit_Click);

             //

             // btn_Del

             //

             this.btn_Del.Location = new System.Drawing.Point(, );

             this.btn_Del.Name = "btn_Del";

             this.btn_Del.Size = new System.Drawing.Size(, );

             this.btn_Del.TabIndex = ;

             this.btn_Del.Text = "删除XML";

             this.btn_Del.UseVisualStyleBackColor = true;

             this.btn_Del.Click += new System.EventHandler(this.btn_Del_Click);

             //

             // btn_Search2

             //

             this.btn_Search2.Location = new System.Drawing.Point(, );

             this.btn_Search2.Name = "btn_Search2";

             this.btn_Search2.Size = new System.Drawing.Size(, );

             this.btn_Search2.TabIndex = ;

             this.btn_Search2.Text = "查询XML2";

             this.btn_Search2.UseVisualStyleBackColor = true;

             this.btn_Search2.Click += new System.EventHandler(this.btn_Search2_Click);

             //

             // btn_Edit2

             //

             this.btn_Edit2.Location = new System.Drawing.Point(, );

             this.btn_Edit2.Name = "btn_Edit2";

             this.btn_Edit2.Size = new System.Drawing.Size(, );

             this.btn_Edit2.TabIndex = ;

             this.btn_Edit2.Text = "修改XML2";

             this.btn_Edit2.UseVisualStyleBackColor = true;

             this.btn_Edit2.Click += new System.EventHandler(this.btn_Edit2_Click);

             //

             // btn_Del2

             //

             this.btn_Del2.Location = new System.Drawing.Point(, );

             this.btn_Del2.Name = "btn_Del2";

             this.btn_Del2.Size = new System.Drawing.Size(, );

             this.btn_Del2.TabIndex = ;

             this.btn_Del2.Text = "删除XML2";

             this.btn_Del2.UseVisualStyleBackColor = true;

             this.btn_Del2.Click += new System.EventHandler(this.btn_Del2_Click);

             //

             // btn_XML_Attribute

             //

             this.btn_XML_Attribute.Location = new System.Drawing.Point(, );

             this.btn_XML_Attribute.Name = "btn_XML_Attribute";

             this.btn_XML_Attribute.Size = new System.Drawing.Size(, );

             this.btn_XML_Attribute.TabIndex = ;

             this.btn_XML_Attribute.Text = "创建多属性XML";

             this.btn_XML_Attribute.UseVisualStyleBackColor = true;

             this.btn_XML_Attribute.Click += new System.EventHandler(this.btn_XML_Attribute_Click);

             //

             // btn_Search_Attribute

             //

             this.btn_Search_Attribute.Location = new System.Drawing.Point(, );

             this.btn_Search_Attribute.Name = "btn_Search_Attribute";

             this.btn_Search_Attribute.Size = new System.Drawing.Size(, );

             this.btn_Search_Attribute.TabIndex = ;

             this.btn_Search_Attribute.Text = "查询多属性XML";

             this.btn_Search_Attribute.UseVisualStyleBackColor = true;

             this.btn_Search_Attribute.Click += new System.EventHandler(this.btn_Search_Attribute_Click);

             //

             // btn_Edit_Attribute

             //

             this.btn_Edit_Attribute.Location = new System.Drawing.Point(, );

             this.btn_Edit_Attribute.Name = "btn_Edit_Attribute";

             this.btn_Edit_Attribute.Size = new System.Drawing.Size(, );

             this.btn_Edit_Attribute.TabIndex = ;

             this.btn_Edit_Attribute.Text = "修改多属性XML";

             this.btn_Edit_Attribute.UseVisualStyleBackColor = true;

             this.btn_Edit_Attribute.Click += new System.EventHandler(this.btn_Edit_Attribute_Click);

             //

             // btn_Del_Attribute

             //

             this.btn_Del_Attribute.Location = new System.Drawing.Point(, );

             this.btn_Del_Attribute.Name = "btn_Del_Attribute";

             this.btn_Del_Attribute.Size = new System.Drawing.Size(, );

             this.btn_Del_Attribute.TabIndex = ;

             this.btn_Del_Attribute.Text = "删除多属性XML";

             this.btn_Del_Attribute.UseVisualStyleBackColor = true;

             this.btn_Del_Attribute.Click += new System.EventHandler(this.btn_Del_Attribute_Click);

             //

             // btn_Del_Attribute2

             //

             this.btn_Del_Attribute2.Location = new System.Drawing.Point(, );

             this.btn_Del_Attribute2.Name = "btn_Del_Attribute2";

             this.btn_Del_Attribute2.Size = new System.Drawing.Size(, );

             this.btn_Del_Attribute2.TabIndex = ;

             this.btn_Del_Attribute2.Text = "删除多属性XML2";

             this.btn_Del_Attribute2.UseVisualStyleBackColor = true;

             this.btn_Del_Attribute2.Click += new System.EventHandler(this.btn_Del_Attribute2_Click);

             //

             // Form1

             //

             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);

             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

             this.ClientSize = new System.Drawing.Size(, );

             this.Controls.Add(this.btn_Del_Attribute2);

             this.Controls.Add(this.btn_Del_Attribute);

             this.Controls.Add(this.btn_Edit_Attribute);

             this.Controls.Add(this.btn_Search_Attribute);

             this.Controls.Add(this.btn_XML_Attribute);

             this.Controls.Add(this.btn_Del2);

             this.Controls.Add(this.btn_Edit2);

             this.Controls.Add(this.btn_Search2);

             this.Controls.Add(this.btn_Del);

             this.Controls.Add(this.btn_Edit);

             this.Controls.Add(this.btn_Edit_Add);

             this.Controls.Add(this.btn_Search);

             this.Controls.Add(this.btn_Create_XML2);

             this.Controls.Add(this.btn_Create_XML);

             this.Name = "Form1";

             this.Text = "XML文件的 增删改查";

             this.ResumeLayout(false);

         }

         #endregion

         private System.Windows.Forms.Button btn_Create_XML;

         private System.Windows.Forms.Button btn_Create_XML2;

         private System.Windows.Forms.Button btn_Search;

         private System.Windows.Forms.Button btn_Edit_Add;

         private System.Windows.Forms.Button btn_Edit;

         private System.Windows.Forms.Button btn_Del;

         private System.Windows.Forms.Button btn_Search2;

         private System.Windows.Forms.Button btn_Edit2;

         private System.Windows.Forms.Button btn_Del2;

         private System.Windows.Forms.Button btn_XML_Attribute;

         private System.Windows.Forms.Button btn_Search_Attribute;

         private System.Windows.Forms.Button btn_Edit_Attribute;

         private System.Windows.Forms.Button btn_Del_Attribute;

         private System.Windows.Forms.Button btn_Del_Attribute2;

     }

 }

Form1.Designer.cs

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