英文:
ASP.NET & C# : gridview select does no action
问题
GridView1_SelectedIndexChanged 为什么不起作用？
我自学ASP.NET（这意味着我通过YouTube学习），使用VS 2015。
我创建了一个项目列表，并希望在文本框中显示所选项目，但代码没有做出任何更改。
我创建了一个空项目，添加了一个主页和默认页面，然后只添加了一个文本框、网格、ScriptManager、UpdatePanel和ContentTemplate。
无论我点击网格上的任何一行的选择按钮，文本框仍然为空。
英文:
Why is GridView1_SelectedIndexChanged not working?
I'm learning ASP.NET on my own (which means I learn through youtube), using VS 2015.
I created a grid of items and want to show the selected item in a textbox, but code doesn't do any change.
I created an empty project, added a masterpage and default page, and just added a text and grid, scriptmanager updatepanel contenttemplate.
Whenever I click select on any row from the grid textbox is still empty.
MasterPage.master:
<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<asp:ContentPlaceHolder id="head" runat="server">
</asp:ContentPlaceHolder>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server">
</asp:ContentPlaceHolder>
</div>
</form>
</body>
</html>
Default.aspx:
<%@ Page Title="" enableeventvalidation="true" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
<style type="text/css">
.auto-style1 {
width: 100%;
}
</style>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<table class="auto-style1">
<tr>
<td>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td>
<asp:GridView ID="GridView1" runat="server" OnSelectedIndexChanged="GridView1_SelectedIndexChanged">
<Columns>
<asp:CommandField ButtonType="Button" ShowSelectButton="True" />
</Columns>
</asp:GridView>
</td>
</tr>
</table>
</ContentTemplate>
</asp:UpdatePanel>
</asp:Content>
Default.aspx.cs:
using System;
using System.Data;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
DataTable tbl = new DataTable();
tbl.Columns.Add("serial");
for (int i = 0; i < 4; i++)
{
DataRow row = tbl.NewRow();
row[0] = i + 1;
tbl.Rows.Add(row);
}
GridView1.DataSource = tbl;
GridView1.DataBind();
}
}
protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
TextBox1.Text = GridView1.SelectedRow.Cells[0].Text;
}
}
答案1
得分: 1
你在SelectedIndexChanged方法中选择了错误的单元格。
第一个单元格（索引0）包含按钮，所以你需要第二个单元格（索引1）。
你应该在该方法上设置一个断点，自己查看GridView中填充了哪些其他属性。
英文:
You are selecting the wrong cell on the SelectedIndexChanged method.
The first Cell (index 0) contains the button, so you want the second cell (index 1).
You should place a breakpoint on the method and see for yourself what other properties are filled in the GridView.
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