Question

基本上我已经创建了一个webform，允许用户通过让用户将他/她的数据值写入textbox来添加，编辑和删除现有xml文件的元素（或记录）。当我创建时，问题出现在这里用于编辑/更新元素值的按钮。只要单击此按钮，用户将需要输入已存在的Student元素的ID属性值，然后将在我的linq查询代码中检查该ID，就像该ID一样是否存在，如果存在，则将所有其他嵌套元素值打印到所有文本框中。下面是我的整个代码和xml文件：

＆＃13;

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="xmlCRUD.aspx.cs" Inherits="WebApplication5.xmlCRUD" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        &nbsp;&nbsp;&nbsp;
        <br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Student-ID :
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        <br />
&nbsp;&nbsp;&nbsp;&nbsp; Student Name:
        <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
        <br />
        <br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Gender :<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
        <br />
        <br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Total Marks :
        <asp:TextBox ID="TextBox4" runat="server"></asp:TextBox>
        <br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Add Student" />
        <br />
        <br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        <asp:Button ID="Button2" runat="server" Text="Edit Data" OnClick="Button2_Click" />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        <asp:TextBox ID="TextBox5" runat="server" Placeholder="Enter student-ID" Visible="False"></asp:TextBox>
        <br />
&nbsp;&nbsp;
        <br />
        <br />
        <br />
        <br />
    
    </div>
    </form>
</body>
</html>

＆＃13;

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml.Linq;

namespace WebApplication5
{
    public partial class xmlCRUD : System.Web.UI.Page
    {
         
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            var student = XElement.Load(@"C:\Users\admin\documents\visual studio 2013\Projects\ClassLibrary1\ClassLibrary1\sample1.xml");
            student.Add(new XElement("Student",
                  new XAttribute("ID", TextBox1.Text),
                  new XElement("Name", TextBox2.Text),
                  new XElement("Gender", TextBox3.Text),
                  new XElement("Marks",TextBox4.Text)
                ));
            student.Save(@"C:\Users\admin\documents\visual studio 2013\Projects\ClassLibrary1\ClassLibrary1\sample1.xml");
        }

        protected void Button2_Click(object sender, EventArgs e)
        {
            Button2.Text = "Update";
           var student = XElement.Load(@"C:\Users\admin\documents\visual studio 2013\Projects\ClassLibrary1\ClassLibrary1\sample1.xml");
            string val = from m in student.Elements("Student").Where(x=>x.Attribute("ID").Value == TextBox5.Text).Select(x=>x.Element("Student"));
        }
    }
}

＆＃13;

<?xml version="1.0" encoding="utf-8"?>
<Students>
  <Student ID="101">
    <Name>kamal</Name>
    <Gender>Male</Gender>
    <Marks>800</Marks>
  </Student>
  <Student ID="102">
    <Name>Sapna</Name>
    <Gender>Female</Gender>
    <Marks>900</Marks>
  </Student>
  <Student ID="103">
    <Name>Raju</Name>
    <Gender>Male</Gender>
    <Marks>870</Marks>
  </Student>
  <Student ID="104">
    <Name>Sushant</Name>
    <Gender>Male</Gender>
    <Marks>700</Marks>
  </Student>
  
</Students>

＆＃13;

请帮助我！

Answer 1

在编辑按钮点击事件功能中使用此代码我做到了：

＆＃13;

   protected void Button2_Click(object sender, EventArgs e)
        {
            Button2.Text = "Update";
           var student = XElement.Load(@"C:\Users\admin\documents\visual studio 2013\Projects\ClassLibrary1\ClassLibrary1\sample1.xml");
            var val = (from m in student.Elements("Student") 
                          where (string)m.Attribute("ID") == TextBox5.Text 
                          select m);
            //XElement a = (XElement)val;
            if (val.Any())
            {
                foreach (XElement element in val)
                {
                    TextBox2.Text = element.Element("Name").Value;
                    TextBox3.Text = element.Element("Gender").Value;
                    TextBox4.Text = element.Element("Marks").Value;
                }
            }
            else
            {
                Label1.Visible = true;
            }
        }

＆＃13;

我想更新xml元素的属性及其在C＃中的嵌套元素值

1 个答案: