在 gridview 中获取特定的数据行？

Question

如何在 asp.net 中获取我的 GridView 的特定数据行？

我这里有这张图片：

示例：我想获取studentID = 2011017997及其CourseNo = 'CmpE 515';

的具体数据行

如何获取他们的具体数据？ GridViewRow 是否具有获取数据行的内置函数之一？

这是 aspx 代码：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ValidateSubjectTeacher.aspx.cs" Inherits="SoftwareAnalysisAndDesign.SAD.ValidateSubjectTeacher" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Student Assessment Form</title>
    <meta charset="utf-8"/>
    <meta name="viewport" content="width=device-width, initial-scale=1"/>
    <link rel="stylesheet" href="Bootstrap/css/bootstrap-theme.css" />
    <link rel="stylesheet" href="Bootstrap/css/bootstrap.min.css"/> 
    <link rel="stylesheet" type="text/css" href="Stylesheets/ValidateSubjectTeacherStyle.css"/>

    <!--Side bar link-->
    <link rel="stylesheet" href="SidebarBootstrap/css/bootstrap.min.css" />
    <link rel="stylesheet" href="SidebarBootstrap/css/simple-sidebar.css" />
</head>
<body>
    <form id="form1" runat="server">
    <div class="container" style="text-align: center; margin: 0 auto;">
        <br />
        <h1>Validation of Subjects</h1>
        <br />
        <asp:GridView runat="server" CssClass="table table-hover table-bordered" ID="ValidateSubject" Style="text-align: center"></asp:GridView>
    </div>

    <div style="float: right; padding-right: 75px;">
        <button type="button" runat="server" class="btn btn-primary" onserverclick="ValidateSubject_Click">Validate</button>
    </div>
    </form>

    <script src="jquery/jquery.min.js"></script>
    <script src="Bootstrap/js/bootstrap.min.js"></script>
</body>
</html>

下面是我的 aspx 代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;

namespace SoftwareAnalysisAndDesign.SAD
{
    public partial class ValidateSubjectTeacher : System.Web.UI.Page
    {
        CheckBox check = new CheckBox();
        protected void Page_Load(object sender, EventArgs e)
        {
            if (Session["ValidateSubject"] == null)
            {
                Response.Redirect("TeacherPage.aspx", true);
            }

            if (!IsPostBack)
            {
                ValidateSubject.DataSource = Session["ValidateSubject"];
                ValidateSubject.DataBind();
            }
            foreach (GridViewRow row in ValidateSubject.Rows)
            {
                check = row.Cells[row.Cells.Count - 1].Controls[0] as CheckBox; //position Check column on last row in gridview
                check.Enabled = true;
                check.CheckedChanged += ValidateSubject_Click; //Bind the event on the button
                check.AutoPostBack = true; //Set the AutoPostBack property to true
            }
        }
        protected void ValidateSubject_Click(object sender, EventArgs e)
        {
            CheckBox chk = (CheckBox)sender;
            GridViewRow grvRow = (GridViewRow)chk.NamingContainer;//This will give row

            string validated = "Validated";
            string notyetvalidated = "Not yet validated";

            if (chk.Checked)
            {
                grvRow.Cells[10].Text = validated;
                //Open Connection
                using (SqlConnection conn = new SqlConnection("Data Source=Keith;Initial Catalog=SAD;Integrated Security=True"))
                {
                    //Open Connection to database
                    try
                    {
                        conn.Open();
                    }
                    catch (Exception E)
                    {
                        Console.WriteLine(E.ToString());
                    }

                    using (SqlCommand cmd = new SqlCommand("Update AssessmentForm set Status = '@Validated' where StudentID = @studentID and CourseNo = '@Coursenumber'" ,conn))
                    {
                        cmd.Parameters.AddWithValue("@Validated", validated);
                        cmd.Parameters.AddWithValue("@studentID", );
                        cmd.Parameters.AddWithValue("@Coursenumber", );
                    }

                    //Close Connection to database
                    try
                    {
                        conn.Open();
                    }
                    catch (Exception E)
                    {
                        Console.WriteLine(E.ToString());
                    }
                }

            }
            else
            {
                grvRow.Cells[10].Text = notyetvalidated;
            }
        }
    }
}

如何在我的 gridview 中获取 studentID 和 courseNo 的值？我想获取 Student ID 和 CourseNo 的数据行并将其放入我的参数之一：

cmd.Parameters.AddWithValue("@studentID", );
cmd.Parameters.AddWithValue("@Coursenumber", );

此问题只是此 link 此处的后续问题现在我想在选中复选框事件并触发按钮 ValidateSubject_Click 事件时更新我的查询。

Answer 1

由于您可以使用 gvRow 访问 GridViewRow，因此您可以从行单元格 1 和 2 访问 StudentID 和 Coursenumber，如下所示

var studentID = grvRow.Cells[0].Text;
var courseNumber = grvRow.Cells[1].Text;

Answer 2

另一个解决您问题的例子是：

<asp:GridView ID="gvStudent" runat="server" AutoGenerateColumns="False" DataSourceID="StudentDataSource">
        <Columns>
            <asp:BoundField DataField="Serial" HeaderText="Serial" SortExpression="Serial" />
            <asp:BoundField DataField="FirstName" HeaderText="FirstName" SortExpression="FirstName" />
            <asp:BoundField DataField="LastName" HeaderText="LastName" SortExpression="LastName" />
            <asp:BoundField DataField="Age" HeaderText="Age" SortExpression="Age" />
            <asp:TemplateField HeaderText="Verified" SortExpression="Verified">
                <EditItemTemplate>
                    <asp:CheckBox ID="CheckBox1" runat="server" Checked='<%# Bind("Verified") %>' />
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:CheckBox ID="CheckBox1" runat="server" Checked='<%# Bind("Verified") %>' 
                        AutoPostBack="true" OnCheckedChanged="chkVerified_CheckedChanged" />
                    <asp:HiddenField ID="hddSerial" runat="server" Value='<%# Bind("Serial") %>' />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
    <asp:Label ID="lblResult" runat="server" Text="You have validate: N/a"></asp:Label>

    <asp:ObjectDataSource ID="StudentDataSource" runat="server" SelectMethod="Get" TypeName="WebFormApp._32846281.Models.Student"></asp:ObjectDataSource>

在你后面的代码中：

 protected void chkVerified_CheckedChanged(object sender, EventArgs e)
    {
        CheckBox chk = (CheckBox)sender;
        GridViewRow grvRow = (GridViewRow)chk.NamingContainer;

        HiddenField hf = grvRow.FindControl("hddSerial") as HiddenField;

        lblResult.Text = string.Format("You have validate:{0}", hf.Value);

    }

这解决了这个问题：如果你重新排序列，首先用这个方法，你必须改变后面的代码

在我的解决方案中，如果您对列重新排序，后面的代码是相同的。

在 gridview 中获取特定的数据行？

Get specific data row in gridview?

c#

sql-server

asp.net

gridview

code-behind