步步为营VS 2008 + .NET 3.5(14) - XLINQ(LINQ to XML)之针对XML文件的添加、查询、更新和删除

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步步为营VS 2008 + .NET 3.5(14) - XLINQ(LINQ to XML)之针对XML文件的添加、查询、更新和删除

作者： webabcd


介绍
以某一XML文件为例，XLINQ(LINQ to XML)之针对XML文件的添加操作、查询操作、更新操作和删除操作


示例
Sample.xml

<? xml version="1.0" encoding="utf-8" ?>
< root >
   < person  name ="webabcd"  age ="27"  salary ="33"   />
</ root >

Sample.aspx

<% @ Page Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Sample.aspx.cs"
    Inherits="LINQ_XLINQ_Sample" Title="针对XML文件的添加、查询、更新和删除"  %>

< asp:Content  ID ="Content1"  ContentPlaceHolderID ="head"  runat ="Server" >
</ asp:Content >
< asp:Content  ID ="Content2"  ContentPlaceHolderID ="ContentPlaceHolder1"  runat ="Server" >
     < p >
        姓名： < asp:TextBox  ID ="txtName"  runat ="server" ></ asp:TextBox >
         &nbsp;&nbsp;  年龄： < asp:TextBox  ID ="txtAge"  runat ="server" ></ asp:TextBox >
         &nbsp;&nbsp;  薪水： < asp:TextBox  ID ="txtSalary"  runat ="server" ></ asp:TextBox >
         < asp:Button  ID ="btnAdd"  runat ="server"  Text ="添加"  OnClick ="btnAdd_Click"   />
     </ p >
     < asp:GridView  ID ="gvPerson"  runat ="server"  DataKeyNames ="name"  OnSelectedIndexChanged ="gvPerson_SelectedIndexChanged"
        OnRowDeleting ="gvPerson_RowDeleting"  OnRowCancelingEdit ="gvPerson_RowCancelingEdit"
        OnRowEditing ="gvPerson_RowEditing"  OnRowUpdating ="gvPerson_RowUpdating" >
         < Columns >
             < asp:CommandField  ShowSelectButton ="True"  ShowEditButton ="True"  ShowDeleteButton ="True" >
             </ asp:CommandField >
         </ Columns >
     </ asp:GridView >
     < br  />
     < asp:DetailsView  ID ="dvPerson"  runat ="server"  DataKeyNames ="name" >
     </ asp:DetailsView >
</ asp:Content >

Sample.aspx.cs

using  System;
using  System.Data;
using  System.Configuration;
using  System.Collections;
using  System.Linq;
using  System.Web;
using  System.Web.Security;
using  System.Web.UI;
using  System.Web.UI.WebControls;
using  System.Web.UI.WebControls.WebParts;
using  System.Web.UI.HtmlControls;
using  System.Xml.Linq;

public  partial  class  LINQ_XLINQ_Sample : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            BindPerson();
        }
    }

    private void BindPerson()
    {
        // 加载指定的xml文件
        XDocument xml = XDocument.Load(Server.MapPath("Sample.xml"));

        // 使用查询语法获取Person集合
        var persons = from p in xml.Root.Elements("person")
                      select new
                      {
                          name = p.Attribute("name").Value,
                          age = p.Attribute("age").Value,
                          salary = p.Attribute("salary").Value
                      };

        gvPerson.DataSource = persons;
        gvPerson.DataBind();
    }

    protected void btnAdd_Click(object sender, EventArgs e)
    {
        // 加载指定的xml文件
        XDocument xml = XDocument.Load(Server.MapPath("Sample.xml"));

        // 创建需要新增的XElement对象
        XElement person = new XElement(
            "person",
            new XAttribute("name", txtName.Text),
            new XAttribute("age", txtAge.Text),
            new XAttribute("salary", txtSalary.Text));

        // 添加需要新增的XElement对象
        xml.Root.Add(person);
        
        // 保存xml
        xml.Save(Server.MapPath("Sample.xml"));

        gvPerson.EditIndex = -1;
        BindPerson();
    }

    protected void gvPerson_SelectedIndexChanged(object sender, EventArgs e)
    {
        // 加载指定的xml文件
        XDocument xml = XDocument.Load(Server.MapPath("Sample.xml"));

        // 使用查询语法获取指定的Person集合
        var persons = from p in xml.Root.Elements("person")
                      where p.Attribute("name").Value == gvPerson.SelectedValue.ToString()
                      select new
                      {
                          name = p.Attribute("name").Value,
                          age = p.Attribute("age").Value,
                          salary = p.Attribute("salary").Value
                      };

        dvPerson.DataSource = persons;
        dvPerson.DataBind();
    }

    protected void gvPerson_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        // 加载指定的xml文件
        XDocument xml = XDocument.Load(Server.MapPath("Sample.xml"));

        // 使用查询语法获取指定的Person集合
        var persons = from p in xml.Root.Elements("person")
                      where p.Attribute("name").Value == gvPerson.DataKeys[e.RowIndex].Value.ToString()
                      select p;

        // 删除指定的XElement对象
        persons.Remove();

        // 保存xml
        xml.Save(Server.MapPath("Sample.xml"));

        gvPerson.EditIndex = -1;
        BindPerson();
    }

    protected void gvPerson_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        // 加载指定的xml文件
        XDocument xml = XDocument.Load(Server.MapPath("Sample.xml"));

        // 使用查询语法获取指定的Person集合
        var persons = from p in xml.Root.Elements("person")
                      where p.Attribute("name").Value == gvPerson.DataKeys[e.RowIndex].Value.ToString()
                      select p;

        // 更新指定的XElement对象
        foreach (XElement xe in persons)
        {
            xe.SetAttributeValue("age", ((TextBox)gvPerson.Rows[e.RowIndex].Cells[2].Controls[0]).Text);
            xe.SetAttributeValue("salary", ((TextBox)gvPerson.Rows[e.RowIndex].Cells[3].Controls[0]).Text);
        }

        // 保存xml
        xml.Save(Server.MapPath("Sample.xml"));

        gvPerson.EditIndex = -1;
        BindPerson();
    }

    protected void gvPerson_RowEditing(object sender, GridViewEditEventArgs e)
    {
        gvPerson.EditIndex = e.NewEditIndex;
        BindPerson();
    }

    protected void gvPerson_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        gvPerson.EditIndex = -1;
        BindPerson();
    }
}

OK
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