Question

I’m currently having a problem in displaying some stuff in ListView. I have a normal C# Student class and a Classroom class. In Classroom class contains a List of Student classes which is shown below:

public class Classroom
{
    int classroomid {set;get;}
    List<Students> students{set;get;}
}

My question is if I bind my DataSource of the ListView to a List of objects of Classroom, how do I render the Student lists in the ListView?

<ListView>
    <ItemTemplate>
        <asp:Label Text='<%# Eval("classroomid") %>'></asp:Label>
        <asp:Label Text='<%# Eval("students") %>'</asp:Label>
        <asp:Label Text='<%# Eval("students.name") %>'</asp:Label>
    </ItemTemplate>
</ListView>

The code above essentially explains that what I’m trying to achieve, or possibly displays the student’s details such as name or etc. Is there any way to achieve that? I do understand that nested ListView works, but I’m not sure how is the implementation.
Thank you for your help in advance. 🙂

Answer 1

You could use string.Join:

<asp:Label runat="server" ID="LblStudents"
    Text='<%# string.Join(",", (List<string>)Eval("students")) %>'>
</asp:Label>

Edit: I missed that Student is a custom type. So you should better do this in the ListView’s ItemDataBound event for readability.

But it should work also on aspx:

<asp:Label runat="server" ID="LblStudents"
    Text='<%# string.Join(",", ((List<Student>)Eval("students")).Select(s=>s.Name)) %>'>
</asp:Label>

in codebehind:

protected void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)
{
    if (e.Item.ItemType == ListViewItemType.DataItem)
    {
        Label LblStudents = (Label)e.Item.FindControl("LblStudents");

        Classroom cr = e.Item.DataItem as Classroom;
        if (cr != null && cr.students != null && cr.students.Count > 0)   
        {
            LblStudents.Text = string.Join(",", cr.students.Select(s => s.Name));
        }
    }
}