ASP.NET - Nested Repeaters

Question

I have a repeater for different updates identified by "Update_ID". Each "Update_ID" has a number of images associated to it.

Therefore, I decided to nest a repeater for the images inside the repeater for updates.

The problem is that the image repeater never shows up, even if there is data to show.

Here is the code in ASP.NET:

<asp:Repeater ID="RepeaterUpdates" runat="server" onitemcommand="RepeaterUpdates_ItemCommand">
    <ItemTemplate>
        <div style="border: thin solid #808080">
            <table id="TableUpdates_Repeater" runat="server" style="width:100%; margin:auto; background-image:url(Resources/Icons/white-background.gif)">
                <tr>
                    <td style="width:25%">
                        <br />
                        <asp:Label ID="LabelUpdateID_Repeater" runat="server" Text="Update ID" Enabled="false"></asp:Label>
                        <asp:TextBox ID="TextBoxUpdateID_Repeater" runat="server" Width="50px" Text='<%# Eval("Update_ID") %>' Enabled="false"></asp:TextBox>
                    </td>
                </tr>
        </table>

        <asp:Repeater ID="RepeaterImages" runat="server">
            <ItemTemplate>
                <label>Hello</label>
                <asp:TextBox Text='<%# DataBinder.Eval(Container.DataItem,"Image_ID") %>' runat="server"></asp:TextBox>
            </ItemTemplate>
        </asp:Repeater>
        </div>
    </ItemTemplate>
</asp:Repeater>

Here is the code-behind:

protected void RepeaterUpdates_ItemCommand(object source, RepeaterCommandEventArgs e)
    {
        SqlConnection conn5 = new SqlConnection(connString);
        SqlDataReader rdr5;
        RepeaterItem item = e.Item;
        TextBox Update_ID = (TextBox)item.FindControl("TextBoxUpdateID_Repeater");

        try
        {
            conn5.Open();
            SqlCommand cmd5 = new SqlCommand("SelectImages", conn5);
            cmd5.CommandType = CommandType.StoredProcedure;
            cmd5.Parameters.Add(new SqlParameter("@update_id", Update_ID.Text));

            rdr5 = cmd5.ExecuteReader();

            if ((item.ItemType == ListItemType.Item) || (item.ItemType == ListItemType.AlternatingItem))
            {
                Repeater ImageRepeater = (Repeater)item.FindControl("RepeaterImages");
                ImageRepeater.DataSource = rdr5;
                ImageRepeater.DataBind();
            }
        }

        finally
        {
            conn5.Close();
        }
}

As previously stated, the child repeater never shows up, even if there is data to display. How can I solve this problem please? Thanks

Answer 1

Rather than onitemcommand, call OnItemDataBound

Change RepeaterCommandEventArgs to RepeaterItemEventArgs

Answer 2

In addition to @Curt. Below is the code.

Code Behind

class Images
{
    public int Image_ID;
}
protected void RepeaterUpdates_ItemCommand(object source, RepeaterCommandEventArgs e)
{
    RepeaterItem item = e.Item;
    TextBox Update_ID = (TextBox)item.FindControl("TextBoxUpdateID_Repeater");

    try
    {
        conn5.Open();
        using (SqlCommand cmd5 = new SqlCommand("SelectImages", conn5))
        {
            cmd5.CommandType = CommandType.StoredProcedure;
            cmd5.Parameters.Add(new SqlParameter("@update_id", Update_ID.Text));
            List<Images> Lst = new List<Images>();

            using (SqlDataReader rdr5 = cmd5.ExecuteReader())
            {
                while (rdr5.Read())
                {
                    Lst.Add(new Images { Image_ID = Convert.ToInt16(rdr5["Image_ID"]) });
                }
                if ((item.ItemType == ListItemType.Item) || (item.ItemType == ListItemType.AlternatingItem))
                {
                    Repeater ImageRepeater = (Repeater)item.FindControl("RepeaterImages");
                    ImageRepeater.DataSource = Lst;
                    ImageRepeater.DataBind();
                }
            }
        }
    }

    finally
    {
        conn5.Close();
    }
}

HTML

You should Register ItemBoundData Event

<asp:Repeater ID="rp" runat="server" onitemdatabound="rp_ItemDataBound">
    <ItemTemplate></ItemTemplate>
</asp:Repeater>

protected void rp_ItemDataBound(object sender, RepeaterItemEventArgs e)
{

}