ERROR :- DataBinding: 'System.Data.DataRowView' does not contain a property with the name 'Optiont4'

Question

在.aspx页面中，我采用了Label Control来显示数据库中的问题， 4 个单选按钮以显示与特定问题相关的四个选项，最后但并非最不重要的是，我使用了隐藏字段来存储特定问题的答案。最后我拿了一个 Button 控件，为此我创建了 onclick 事件，我将在该事件上执行操作以生成分数。

在 .aspx.cs 页面中，在按钮的 onclick 事件上，我使用下面提到的代码从 aspx 页面获取控件，并进一步我使用 if 语句来查看哪个单选按钮处于活动状态，并将相应的值存储在变量“selans”中，使用这个“selans”，我会将它与隐藏字段的值进行比较，以确定是否选中单选按钮是否为正确答案，如果答案正确，即“selans”中的值与隐藏字段（实际答案）中的值匹配，变量“count”（初始值为 0）相应递增，并且所有这些代码都放在“for循环”中，它将执行到第一个。 GridView 中的控件数量（您可以将其与问题编号相关联，因为对于每条记录，GridView 都会生成新控件）。

但是当我运行它时，我收到了这个错误:-

DataBinding: 'System.Data.DataRowView' does not contain a property with the name 'Optiont4'.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.Web.HttpException: DataBinding: 'System.Data.DataRowView' does not contain a property with the name 'Optiont4'.

Source Error: 


Line 115:            <asp:RadioButton ID="rad2" runat="server" Text='<%#Eval("Option2") %>' GroupName="A" />
Line 116:            <asp:RadioButton ID="rad3" runat="server" Text='<%#Eval("Option3") %>' GroupName="A" />
Line 117:            <asp:RadioButton ID="rad4" runat="server" Text='<%#Eval("Optiont4")%>' GroupName="A" />
Line 118:            <asp:HiddenField ID="hf" runat="server" Value='<%#Eval("CorrectAns")%>' />
Line 119:

Source File: e:\Way2Success\Student\Examdemo.aspx    Line: 117

此处.aspx页面错误行号为30

看看我的代码。告诉我我是否犯了错误，解决方案是什么。

.aspx :-

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Examdemo.aspx.cs" Inherits="Student_Examdemo" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
  </head>
<body>
    <form id="form2" runat="server">
        <div>
<div id="tabs">
    <ul>
        <li><a href="#tabs-1">Tab 1</a></li>
        <li><a href="#tabs-2">Tab 2</a></li>
        <li><a href="#tabs-3">Tab 3</a></li>
        <li><a href="#tabs-4">Tab 4</a></li>
        <li><a href="#tabs-5">Tab 5</a></li>
    </ul>
    <div id="tabs-1">
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" >
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
            <asp:Label ID="Label1" runat="server" Text='<%#Eval("Question") %>'></asp:Label>
            <br />
            <br />
            <br />
           <asp:RadioButton ID="rad1" runat="server" Text='<%#Eval("Option1") %>' GroupName="A" />
            <asp:RadioButton ID="rad2" runat="server" Text='<%#Eval("Option2") %>' GroupName="A" />
            <asp:RadioButton ID="rad3" runat="server" Text='<%#Eval("Option3") %>' GroupName="A" />
            <asp:RadioButton ID="rad4" runat="server" Text='<%#Eval("Option4") %>' GroupName="A" />
            <asp:HiddenField ID="hf" runat="server" Value='<%#Eval("CorrectAns") %>' />

        <br />
        <br />

                 </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>
   
    </div>
    <div id="tabs-2">
        

        <asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="false" >
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
            <asp:Label ID="Label1" runat="server" Text='<%#Eval("Question") %>'></asp:Label>
            <br />
            <br />
            <br />
           <asp:RadioButton ID="rad1" runat="server" Text='<%#Eval("Option1") %>' GroupName="A" />
            <asp:RadioButton ID="rad2" runat="server" Text='<%#Eval("Option2") %>' GroupName="A" />
            <asp:RadioButton ID="rad3" runat="server" Text='<%#Eval("Option3") %>' GroupName="A" />
            <asp:RadioButton ID="rad4" runat="server" Text='<%#Eval("Optiont4")%>' GroupName="A" />
            <asp:HiddenField ID="hf" runat="server" Value='<%#Eval("CorrectAns")%>' />

        <br />
        <br />

                 </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

    </div>
    <div id="tabs-3">
        Tab 3 Content
    </div>
     <div id="tabs-4">
        Tab 4 Content
    </div>
     <div id="tabs-5">
        Tab 5 Content
    </div>
</div>
<input type="button" id="btnPrevious" value="Previous" style = "display:none"/>
<input type="button" id="btnNext" value="Next" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
           
            <asp:Button class="panelButton" runat="server" Text="Finish the exam" ClientIDMode="Static" OnClick="btn_Click" />
            <br />
    </div>
    </form>
</body>
</html>

.aspx.cs :-

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;
using System.Configuration;


public partial class Student_Examdemo : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
    {
        GridView1.DataSource = GetData("SELECT top 2 Question, Option1, Option2, Option3, Option4, CorrectAns, Explanation FROM Questions");
        GridView1.DataBind();
        GridView2.DataSource = GetData("SELECT top 2 Question, Option1, Option2, Option3, Option4, CorrectAns, Explanation FROM Questions WHERE SectionId=2");
        GridView2.DataBind();

private DataSet GetData(string query)
{
    string conString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
    SqlCommand cmd = new SqlCommand(query);
    using (SqlConnection con = new SqlConnection(conString))
    {
        using (SqlDataAdapter sda = new SqlDataAdapter())
        {
            cmd.Connection = con;
            sda.SelectCommand = cmd;
            using (DataSet ds = new DataSet())
            {
                sda.Fill(ds);
                return ds;
            }
        }
    }
}

protected void btn_Click(object sender, EventArgs e)
{

            RadioButton r1, r2, r3, r4;
            HiddenField hdn;
            int count = 0;
            int neg = 0;
            int total;
            int totalf=0;
            int totals=0;
            int totalt;
            int totalfo;
            int totalfi;
            string selans = "-1";
            for (int i = 0; i < GridView1.Rows.Count; i++)
            {
                r1 = (RadioButton)GridView1.Rows[i].Cells[0].FindControl("rad1");
                r2 = (RadioButton)GridView1.Rows[i].Cells[0].FindControl("rad2");
                r3 = (RadioButton)GridView1.Rows[i].Cells[0].FindControl("rad3");
                r4 = (RadioButton)GridView1.Rows[i].Cells[0].FindControl("rad4");
                hdn = (HiddenField)GridView1.Rows[i].Cells[0].FindControl("hf");
                if (r1.Checked)
                {
                    selans = r1.Text;
                }
                else if (r2.Checked)
                {
                    selans = r2.Text;
                }
                else if (r3.Checked)
                {
                    selans = r3.Text;
                }
                else if (r4.Checked)
                {
                    selans = r4.Text;
                }

                if (hdn.Value == selans)
                {
                    count++;
                }
                else
                {
                   neg--;
                }

                totalf = count + neg;


            }

    for (int i = 0; i < GridView2.Rows.Count; i++)
    {
        r1 = (RadioButton)GridView2.Rows[i].Cells[0].FindControl("rad1");
        r2 = (RadioButton)GridView2.Rows[i].Cells[0].FindControl("rad2");
        r3 = (RadioButton)GridView2.Rows[i].Cells[0].FindControl("rad3");
        r4 = (RadioButton)GridView2.Rows[i].Cells[0].FindControl("rad4");
        hdn = (HiddenField)GridView2.Rows[i].Cells[0].FindControl("hf");
        if (r1.Checked)
        {
            selans = r1.Text;
        }
        else if (r2.Checked)
        {
            selans = r2.Text;
        }
        else if (r3.Checked)
        {
            selans = r3.Text;
        }
        else if (r4.Checked)
        {
            selans = r4.Text;
        }

        if (hdn.Value == selans)
        {
            count++;
        }
        else
        {
            neg--;
        }

        totals = count + neg;

    }
    total = totalf + totals;
    Session["score"] = total;

}


}

Answer 1

您的 GridView2 定义中存在输入错误。

<asp:RadioButton ID="rad4" runat="server" Text='<%#Eval("Optiont4")%>' GroupName="A" />

应该是

<asp:RadioButton ID="rad4" runat="server" Text='<%#Eval("Option4")%>' GroupName="A" />

ERROR :- DataBinding: 'System.Data.DataRowView' does not contain a property with the name 'Optiont4'

ERROR :- DataBinding: 'System.Data.DataRowView' does not contain a property with the name 'Optiont4'

c#

sql-server

asp.net

data-binding

webforms