回答編集履歴
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追記
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イベントハンドラの引数 RepeaterItemEventArgs の Item プロパティで RepeaterItem を取得し、その中に含まれるコントロールの中から CheckBox を探して、その ID プロパティに T クラスに含まれる文字列データを設定するようにしてみてください。
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**【2020/9/1 追記】**
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上のように言っておいて、もしできなかったら何ですので検証してみました。検証に使ったコードと結果の画像を貼っておきます。上の回答で書いた List<T> 型のオブジェクトというのは下の .aspx.cs の CreateDataSource メソッドで作られる List<SampleData> で、List<T> の T クラスは SampleData になります。
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**.aspx.cs**
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```
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Web;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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namespace WebApplication1
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{
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public partial class WebForm9 : System.Web.UI.Page
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{
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protected void Page_Load(object sender, EventArgs e)
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{
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if (!IsPostBack)
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{
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Repeater1.DataSource = CreateDataSource();
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Repeater1.DataBind();
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}
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}
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protected List<SampleData> CreateDataSource()
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{
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var list = new List<SampleData>();
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for (int i = 0; i < 5; i++)
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{
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var data = new SampleData
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{
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Id = i,
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Name = "Name-" + i,
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Price = 100m * (i + 1),
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CheckBoxId = "CheckBox" + i
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};
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list.Add(data);
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}
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return list;
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}
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protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
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{
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if (e.Item.ItemType == ListItemType.Item ||
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e.Item.ItemType == ListItemType.AlternatingItem)
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{
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foreach (Control ctrl in e.Item.Controls)
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{
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if (ctrl is CheckBox)
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{
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((CheckBox)ctrl).ID = ((SampleData)e.Item.DataItem).CheckBoxId;
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break;
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}
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}
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}
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}
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}
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public class SampleData
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{
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public int Id { get; set; }
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public string Name { get; set; }
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public decimal Price { get; set; }
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public string CheckBoxId { get; set; }
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}
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}
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```
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**.aspx**
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```
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<%@ Page Language="C#" AutoEventWireup="true"
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CodeBehind="WebForm9.aspx.cs"
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Inherits="WebApplication1.WebForm9" %>
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<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head runat="server">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
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<title></title>
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<style type="text/css">
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table.style1
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{
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border-style: solid;
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border-width: 2px;
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border-color: Black;
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text-align: center;
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border-collapse: collapse;
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}
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table.style1 th
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{
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border-style: solid;
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border-width: 2px 1px 2px 1px;
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border-color: Black;
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background-color: #6699FF;
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color: #FFFFFF;
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}
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table.style1 td
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{
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border-style: solid;
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border-width: 1px;
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border-color: Black;
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}
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</style>
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</head>
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<body>
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<form id="form1" runat="server">
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<div>
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<asp:Repeater ID="Repeater1" runat="server"
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OnItemDataBound="Repeater1_ItemDataBound">
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<HeaderTemplate>
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<table class="style1">
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<tr>
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<th>ID</th>
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<th>Name</td>
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<th>Price</th>
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<th>Check</th>
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</tr>
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</HeaderTemplate>
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<ItemTemplate>
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<tr>
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<td><%# Eval("ID")%></td>
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<td><%# Eval("Name")%></td>
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<td><%# Eval("Price")%></td>
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<td>
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<asp:CheckBox runat="server" ClientIDMode="Static" />
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</td>
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</tr>
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</ItemTemplate>
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<FooterTemplate>
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</table>
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</FooterTemplate>
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</asp:Repeater>
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</div>
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</form>
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</body>
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</html>
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```
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**結果**
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**html**
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