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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