为什么我选择的索引值在单选按钮列表中没有变化 [英] why my selected index value is not changing in radio button list

问题描述

protected void Button1_Click(object sender, EventArgs e)
 {
  for (int i = 0; i < GridView1.Rows.Count; i++)
 {
              RadioButtonList rbAtt = (RadioButtonList)GridView1.Rows[i].Cells[3].FindControl("rbAtt");
   if (rbAtt.SelectedIndex != null)
     {
     string sid = GridView1.Rows[i].Cells[0].Text;
     con.Open();
     SqlCommand cmd = new SqlCommand("InsertAttendence", con);
     cmd.CommandType = CommandType.StoredProcedure;
    cmd.Parameters.AddWithValue("@Date", (DateTime.Now.Month + DateTime.Now.Year).ToString());
   cmd.Parameters.AddWithValue("@StudentId", sid);
  if (dlAtt.SelectedItem.Text == "Morning")
     {
       cmd.Parameters.AddWithValue("@Morning", rbAtt.SelectedValue);
      }
      else
      {
         cmd.Parameters.AddWithValue("@Morning", DBNull.Value);
       }
      if (dlAtt.SelectedItem.Text == "Evening")
      {
        cmd.Parameters.AddWithValue("@Evening", rbAtt.SelectedItem.Value);
       }
        else
     {
        cmd.Parameters.AddWithValue("@Evening", DBNull.Value);
        }
        cmd.Parameters.AddWithValue("@PostedOn", DateTime.Now.ToLocalTime());
        cmd.Parameters.AddWithValue("@PostedBy", Session["StaffId"].ToString());
        cmd.ExecuteNonQuery();
        con.Close();

          }
      }

如果每次选择此行中的if(rbAtt.SelectedIndex！= null)，它将采用的索引值仅为-1.

这是我的ASPX代码:

if (rbAtt.SelectedIndex != null) in this line at every selection it will take index value is -1 only.

This is my ASPX code:

<pre lang="ASPX">
 <asp:GridView ID="GridView1" runat="server" CellPadding="4" ForeColor="#333333" 
            GridLines="None" AutoGenerateColumns="False"
           >
            <Columns>
            <asp:BoundField DataField="AdmissionNo" HeaderText="AdmissionNo" />
            <asp:BoundField DataField="RollNo" HeaderText="StudentId" />
            <asp:BoundField DataField="FullName" HeaderText="StuName" />
            <asp:TemplateField HeaderText="Attendence">
            <ItemTemplate>
          <asp:RadioButtonList ID="rbAtt" runat="server">
           <asp:ListItem Value="p">Present</asp:ListItem>
          <asp:ListItem Value="A">Absent</asp:ListItem>
          <asp:ListItem Value="L">Leave</asp:ListItem>
        </asp:RadioButtonList>
            </ItemTemplate>
            
            </asp:TemplateField>
            
            </Columns>
        </asp:GridView>

推荐答案

默认情况下，RadioButtonList仅给出-1索引，因此默认情况下要选择一个值，如下所示.

Hi,

By default RadioButtonList will give -1 index only, so you want to give by default one value should be selected like below.

<asp:TemplateField HeaderText="Attendence">
                    <ItemTemplate>
                        <asp:RadioButtonList ID="rbAtt" runat="server">
                            <asp:ListItem Text="Present" Selected="True" Value="p"></asp:ListItem>
                            <asp:ListItem Text="Absent" Value="A"></asp:ListItem>
                            <asp:ListItem Text="Leave" Value="L"></asp:ListItem>
                        </asp:RadioButtonList>
                    </ItemTemplate>
                </asp:TemplateField>

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