XML 增、删、改和查示例

且走且看且安然

且走且看且安然

2016-02-19 21:44

今天图老师小编给大家介绍下XML 增、删、改和查示例,平时喜欢XML 增、删、改和查示例的朋友赶紧收藏起来吧!记得点赞哦~

  1.已知有一个XML文件(bookstore.xml)如下:

  
   ?xml version="1.0" encoding="gb2312"?
  bookstore
    book genre="fantasy" ISBN="2-3631-4"
      titleOberon's Legacy/title
      authorCorets, Eva/author
      price5.95/price
    /book
  /bookstore

   

   

   
    1、往bookstore节点中插入一个book节点:

   

  
      XmlDocument xmlDoc=new XmlDocument();
     xmlDoc.Load("bookstore.xml");
     XmlNode root=xmlDoc.SelectSingleNode("bookstore");//查找bookstore
     XmlElement xe1=xmlDoc.CreateElement("book");//创建一个book节点
     xe1.SetAttribute("genre","李赞红");//设置该节点genre属性
     xe1.SetAttribute("ISBN","2-3631-4");//设置该节点ISBN属性
   
     XmlElement xesub1=xmlDoc.CreateElement("title");
     xesub1.InnerText="CS从入门到精通";//设置文本节点
     xe1.AppendChild(xesub1);//添加到book节点中
     XmlElement xesub2=xmlDoc.CreateElement("author");
     xesub2.InnerText="候捷";
     xe1.AppendChild(xesub2);
     XmlElement xesub3=xmlDoc.CreateElement("price");
     xesub3.InnerText="58.3";
     xe1.AppendChild(xesub3);
   
     root.AppendChild(xe1);//添加到bookstore节点中
     xmlDoc.Save("bookstore.xml");

   

   

    //================
    结果为:

   

  
   ?xml version="1.0" encoding="gb2312"?
  bookstore
    book genre="fantasy" ISBN="2-3631-4"
      titleOberon's Legacy/title
      authorCorets, Eva/author
      price5.95/price
    /book
    book genre="李赞红" ISBN="2-3631-4"
      titleCS从入门到精通/title
      author候捷/author
      price58.3/price
    /book
  /bookstore

   

   

  2、修改节点:将genre属性值为“李赞红“的节点的genre值改为“update李赞红”,将该节点的子节点author的文本修改为“亚胜”。

  
       XmlNodeList nodeList=xmlDoc.SelectSingleNode("bookstore").ChildNodes;//获取bookstore节点的所有子节点
     foreach(XmlNode xn in nodeList)//遍历所有子节点
     {
      XmlElement xe=(XmlElement)xn;//将子节点类型转换为XmlElement类型
      if(xe.GetAttribute("genre")=="李赞红")//如果genre属性值为“李赞红”
      {
       xe.SetAttribute("genre","update李赞红");//则修改该属性为“update李赞红”
   
       XmlNodeList nls=xe.ChildNodes;//继续获取xe子节点的所有子节点
       foreach(XmlNode xn1 in nls)//遍历
       {
        XmlElement xe2=(XmlElement)xn1;//转换类型
        if(xe2.Name=="author")//如果找到
        {
         xe2.InnerText="亚胜";//则修改
         break;//找到退出来就可以了
        }
       }
       break;
      }
     }
   
     xmlDoc.Save("bookstore.xml");//保存。

   

  
    //=================

    最后结果为:

  
   ?xml version="1.0" encoding="gb2312"?
  bookstore
    book genre="fantasy" ISBN="2-3631-4"
      titleOberon's Legacy/title
      authorCorets, Eva/author
      price5.95/price
    /book
    book genre="update李赞红" ISBN="2-3631-4"
      titleCS从入门到精通/title
      author亚胜/author
      price58.3/price
    /book
  /bookstore

   

   
    3、删除 book genre="fantasy" ISBN="2-3631-4"节点的genre属性,删除 book genre="update李赞红" ISBN="2-3631-4"节点。

  
   XmlNodeList xnl=xmlDoc.SelectSingleNode("bookstore").ChildNodes;
   
     foreach(XmlNode xn in xnl)
     {
      XmlElement xe=(XmlElement)xn;
   

   

   

   

   

       if(xe.GetAttribute("genre")=="fantasy")
      {
       xe.RemoveAttribute("genre");//删除genre属性
      }
      else if(xe.GetAttribute("genre")=="update李赞红")
      {
       xe.RemoveAll();//删除该节点的全部内容
      }
     }
     xmlDoc.Save("bookstore.xml");

   

    //====================
   
    最后结果为:

  
   ?xml version="1.0" encoding="gb2312"?
  bookstore
    book ISBN="2-3631-4"
      titleOberon's Legacy/title
      authorCorets, Eva/author
      price5.95/price
    /book
    book
    /book
  /bookstore

   4、显示所有数据。

(本文来源于图老师网站,更多请访问http://m.tulaoshi.com/webkaifa/)

  
    XmlNode xn=xmlDoc.SelectSingleNode("bookstore");
   
     XmlNodeList xnl=xn.ChildNodes;
    
     foreach(XmlNode xnf in xnl)
     {
      XmlElement xe=(XmlElement)xnf;
      Console.WriteLine(xe.GetAttribute("genre"));//显示属性值
      Console.WriteLine(xe.GetAttribute("ISBN"));
   
      XmlNodeList xnf1=xe.ChildNodes;
      foreach(XmlNode xn2 in xnf1)
      {
       Console.WriteLine(xn2.InnerText);//显示子节点点文本
      }
     }
   

  留做参考,原文地址http://blog.yesky.com/75/richsee/1211075.shtml

  2前台代码:html

  
  %@ Page language="c#" Codebehind="Main.aspx.cs" AutoEventWireup="false" Inherits="DsAndXML.OpXMLFile.Main" %
  !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
  HTML
      HEAD
          titleMain/title
          meta name="GENERATOR" Content="Microsoft Visual Studio 7.0"
          meta name="CODE_LANGUAGE" Content="C#"
          meta name="vs_defaultClientScript" content="JavaScript"
          meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"
      /HEAD
      body MS_POSITIONING="GridLayout"
          form id="Main" method="post" runat="server"
              FONT face="宋体"
                  asp:DataGrid id="dgShow" style="Z-INDEX: 100; LEFT: 113px; POSITION: absolute; TOP: 32px" runat="server" Width="480px" Height="178px"/asp:DataGrid
                  asp:Label id="Label3" style="Z-INDEX: 111; LEFT: 187px; POSITION: absolute; TOP: 383px" runat="server" Width="120px" Height="21px"新邮件地址:/asp:Label
                  asp:Label id="Label2" style="Z-INDEX: 107; LEFT: 333px; POSITION: absolute; TOP: 274px" runat="server" Width="83px" Height="21px"邮件地址:/asp:Label
                  asp:Button id="btnAdd" style="Z-INDEX: 104; LEFT: 298px; POSITION: absolute; TOP: 324px" runat="server" Text="添加"/asp:Button
                  asp:Button id="btnDelete" style="Z-INDEX: 103; LEFT: 199px; POSITION: absolute; TOP: 324px" runat="server" Text="删除"/asp:Button
                  asp:Button id="btnChange" style="Z-INDEX: 102; LEFT: 102px; POSITION: absolute; TOP: 382px" runat="server" Text="修改"/asp:Button
                  asp:Button id="btnQuery" style="Z-INDEX: 101; LEFT: 101px; POSITION: absolute; TOP: 324px" runat="server" Text="查询"/asp:Button
                  asp:DropDownList id="ddlName" style="Z-INDEX: 105; LEFT: 210px; POSITION: absolute; TOP: 274px" runat="server" Width="95px" Height="78px"/asp:DropDownList
                  asp:Label id="Label1" style="Z-INDEX: 106; LEFT: 100px; POSITION: absolute; TOP: 274px" runat="server" Width="83px" Height="21px"姓名:/asp:Label
                  asp:Label id="lbEmail" style="Z-INDEX: 109; LEFT: 459px; POSITION: absolute; TOP: 274px" runat="server" Width="231px"/asp:Label
                  asp:TextBox id="tbNewMail" style="Z-INDEX: 110; LEFT: 330px; POSITION: absolute; TOP: 381px" runat="server" Width="208px" Height="26px"/asp:TextBox/FONT
          /form
      /body
  /HTMLXML文件dbGuest.xml
  ?xml version="1.0" standalone="yes"?
  dbGuest
    User
      Nameaaa/Name
      Cityshanghai/City
      Emailaaa@263.net/Email
      Messageok/Message
      STime2004-07-12T00:00:00.0000000+08:00/STime
    /User
    User
      Nameshaoazhd/Name
      Citybeijing/City
      Emailsss@22.net/Email
      Messageafsa/Message
      STime2004-7-12 15:07:39/STime
    /User
    User
      NameGuset/Name
      City上海/City
      Emailsfaf@22.net/Email
    /User
    User
      NameGuset/Name
      City上海/City
      Emailss@22.net/Email
    /User
  /dbGuestusing System;
  using System.Collections;
  using System.ComponentModel;
  using System.Data;
  using System.Drawing;
  using System.Web;
  using System.Web.SessionState;
  using System.Web.UI;
  using System.Web.UI.WebControls;
  using System.Web.UI.HtmlControls;
  using System.Xml;
  using System.Xml.XPath;
  namespace DsAndXML.OpXMLFile
  {
      /**//// summary
      /// Main 的摘要说明。
      /// /summary
      public class Main : System.Web.UI.Page
      {
          protected System.Web.UI.WebControls.Button btnQuery;
          protected System.Web.UI.WebControls.Button btnChange;
          protected System.Web.UI.WebControls.Button btnDelete;
          protected System.Web.UI.WebControls.Button btnAdd;
          protected System.Web.UI.WebControls.DropDownList ddlName;
          protected System.Web.UI.WebControls.Label Label1;
          protected System.Web.UI.WebControls.Label Label2;
          protected System.Web.UI.WebControls.Label lbEmail;
          protected System.Web.UI.WebControls.TextBox tbNewMail;
          protected System.Web.UI.WebControls.Label Label3;
          protected System.Web.UI.WebControls.DataGrid dgShow;
     
          private void Page_Load(object sender, System.EventArgs e)
          {
              // 在此处放置用户代码以初始化页面
              if(!IsPostBack)
              Bind();

          }
          private void Bind()
          {
              DataSet ds = new DataSet();
              ds.ReadXml(Server.MapPath(".dbdbGuest.xml"));
              dgShow.DataSource = ds.Tables[0].DefaultView;
              dgShow.DataBind();
              XmlDocument doc = new XmlDocument();
              doc.Load(Server.MapPath(".dbdbGuest.xml"));
              XmlNodeList elemList = doc.GetElementsByTagName("Name");
              ddlName.Items.Clear();
              for(int i=0;ielemList.Count;i++)
               ddlName.Items.Add(elemList[i].InnerXml);
             
          }

(本文来源于图老师网站,更多请访问http://m.tulaoshi.com/webkaifa/)

          Web Form Designer generated code#region Web Form Designer generated code
          override protected void OnInit(EventArgs e)
          {
              //
              // CODEGEN:该调用是 ASP.NET Web 窗体设计器所必需的。
              //
              InitializeComponent();
              base.OnInit(e);
          }
         
          /**//// 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.btnQuery.Click += new System.EventHandler(this.btnQuery_Click);
              this.btnChange.Click += new System.EventHandler(this.btnChange_Click);
              this.btnDelete.Click += new System.EventHandler(this.btnDelete_Click);
              this.btnAdd.Click += new System.EventHandler(this.btnAdd_Click);
              this.Load += new System.EventHandler(this.Page_Load);

          }
          #endregion

          private void btnQuery_Click(object sender, System.EventArgs e)
          {
              XmlDocument doc = new XmlDocument();
              doc.Load(Server.MapPath(".dbdbGuest.xml"));
              lbEmail.Text = doc.SelectSingleNode("//User[Name='"+ddlName.SelectedItem.Text+"']").ChildNodes.Item(2).InnerText;
          
          }

          private void btnChange_Click(object sender, System.EventArgs e)
          {
              XmlDocument xmlDoc = new XmlDocument();
              xmlDoc.Load(Server.MapPath(".dbdbGuest.xml"));
              XmlNodeList nodeList=xmlDoc.SelectSingleNode("dbGuest").ChildNodes;//获取dbGuest节点的所有子节点
              foreach(XmlNode xn in nodeList)//遍历所有子节点
              {
                  XmlElement xe=(XmlElement)xn;//将子节点类型转换为XmlElement类型
             
                  XmlNodeList node = xe.GetElementsByTagName("Name");
                  if(node.Count0)
                  {

                      if(node[0].InnerText==ddlName.SelectedItem.Text)
                      {
                          XmlNodeList nls=xe.ChildNodes;//继续获取xe子节点的所有子节点
                          foreach(XmlNode xn1 in nls)//遍历
                          {
                              XmlElement xe2=(XmlElement)xn1;//转换类型
                              if(xe2.Name=="Email")//如果找到
                              {
                                  xe2.InnerText=tbNewMail.Text;//则修改
                                  break;//找到退出来就可以了
                              }
                          }
                          break;
                      }
                  }
                 
              }
              xmlDoc.Save(Server.MapPath(".dbdbGuest.xml"));
              Bind();
          }

          private void btnDelete_Click(object sender, System.EventArgs e)
          {
              XmlDocument xmlDoc = new XmlDocument();
              xmlDoc.Load(Server.MapPath(".dbdbGuest.xml"));
              XmlNodeList xnl=xmlDoc.SelectSingleNode("dbGuest").ChildNodes;
   
              foreach(XmlNode xn in xnl)
              {
                  XmlElement xe=(XmlElement)xn;
                  XmlNodeList node = xe.GetElementsByTagName("Name");
                  if(node.Count0)
                  {

                      if(node[0].InnerText==ddlName.SelectedItem.Text)
                          xe.RemoveAll();//删除该节点的全部内容
                      break;
                  }
              }
             
              xmlDoc.Save(Server.MapPath(".dbdbGuest.xml"));
              Bind();
          }

          private void btnAdd_Click(object sender, System.EventArgs e)
          {
              XmlDocument xmlDoc = new XmlDocument();
              xmlDoc.Load(Server.MapPath(".dbdbGuest.xml"));
              XmlNode root=xmlDoc.SelectSingleNode("dbGuest");//查找dbGuest
              XmlElement xe1=xmlDoc.CreateElement("User");//创建一个User节点
              XmlElement xesub1=xmlDoc.CreateElement("Name");
              xesub1.InnerText="Guset";//设置文本节点
              xe1.AppendChild(xesub1);//添加到User节点中
              XmlElement xesub2=xmlDoc.CreateElement("City");
              xesub2.InnerText="上海";
              xe1.AppendChild(xesub2);
              XmlElement xesub3=xmlDoc.CreateElement("Email");
              xesub3.InnerText="ss@22.net";
              xe1.AppendChild(xesub3);
   
              root.AppendChild(xe1);//添加到dbGuest节点中
              xmlDoc.Save(Server.MapPath(".dbdbGuest.xml"));
              Bind();
          }
      }
  }
  http://www.cnblogs.com/skylaugh/archive/2006/12/18/595634.html

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