Question

假设我有以下列表：

First Name   Last Name 
Bob          Wonder 
Helen        Wood
...,         ....,

我可以使用转发器并在asp.net中将源绑定到此，但我这样做如下：

<asp:TextBox ID="txtName" runat="server" EnableVIewState="true" Text='<%# Eval("Name") %>'></asp:TextBox>
<asp:TextBox ID="txtLstNumber" runat="server" EnableVIewState="true" Text='<%# Eval("LastName") %>'></asp:TextBox>

然后我只是从联系人列表中绑定这些。我遇到的问题是我需要更新XML中的记录，如下所示：

<Contact name="Bob" lastName="wonder">

我遇到的问题是我不明白如何关联两个文本框以便它们彼此相关，那么我可以只更新XML？例如，如果＆＃34; Bob＆＃34;改变了他的姓氏，然后我会更新＆＃34; Bob＆＃34;在XML？

Answer 1

您需要将数据的某些字段/列作为主键或ID，例如数字1,2，..这些都不会改变。

但是，仅更新联系人时，将使用联系人索引作为标识。

标记：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html>
<html>
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:Repeater ID="repeater1" runat="server" OnItemDataBound="repeater1_ItemDataBound">
        <HeaderTemplate>
            <table>
        </HeaderTemplate>
        <ItemTemplate>
            <tr>
                <td>
                    Name
                </td>
                <td>
                    <asp:TextBox ID="txtName" runat="server" />
                </td>

                <td>
                    Last name
                </td>
                <td>
                    <asp:TextBox ID="txtLstNumber" runat="server" />
                </td>
            </tr>
        </ItemTemplate>
        <FooterTemplate>
            </table></FooterTemplate>
    </asp:Repeater>
    <asp:Button ID="SaveButton" runat="server" Text="Save" 
        onclick="SaveButton_Click" />
    </form>
</body>
</html>

CS

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml;
using System.IO;

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

    }

    private void readxml()
    {
        var xmldoc = new XmlDocument();
                xmldoc.Load(Server.MapPath("contacts.xml"));
        var xmlnodes = xmldoc.GetElementsByTagName("Contact");

        repeater1.DataSource = xmlnodes;
        repeater1.DataBind();

        xmldoc = null;
    }

    protected void repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
        if (e.Item.ItemType != ListItemType.Item && e.Item.ItemType != ListItemType.AlternatingItem) return;

        var node = (XmlNode)e.Item.DataItem;  
        var txtName = (TextBox)e.Item.FindControl("txtName");
        txtName.Text = node.Attributes["name"].Value;
        var txtLstNumber = (TextBox)e.Item.FindControl("txtLstNumber");
        txtLstNumber.Text = node.Attributes["lastName"].Value;
    }

    protected void SaveButton_Click(object sender, EventArgs e)
    {

        var xmldoc = new XmlDocument();
        xmldoc.Load(Server.MapPath("contacts.xml"));
        var xmlnodes = xmldoc.GetElementsByTagName("Contact");


        for (var i = 0; i < repeater1.Items.Count; i++)
        {
            var item = repeater1.Items[i];
            var txtName = (TextBox)item.FindControl("txtName");
            var name =  txtName.Text ;
            var txtLstNumber = (TextBox)item.FindControl("txtLstNumber");
            var lastName = txtLstNumber.Text;

            var node = xmlnodes[i];
            node.Attributes["name"].Value = name;
            node.Attributes["lastName"].Value = lastName;
        }

        xmldoc.Save(Server.MapPath("contacts.xml"));
        xmldoc = null;
    }
}

XML文件

<?xml version="1.0" encoding="utf-8"?>
<root>
  <Contact name="bob" lastName="jan" />
  <Contact name="john " lastName="doe" />
</root>

C＃asp.net - Repeater文本框的集合

1 个答案: