Question

I have the following structure

<asp:UpdatePanel ID="MyUpdatePanel" runat="server">
    <ContentTemplate>
        <asp:MultiView ID="MyViews" runat="server">
            <asp:View ID="List" runat="server">
                <asp:Repeater runat="server" ID="Repeater1">
                    <ItemTemplate>
                        <asp:LinkButton ID="Button1" runat="server" Text="Button1" CommandName="View" />
                    </ItemTemplate>
                </asp:Repeater>
            </asp:View>
            <asp:View ID="Single" runat="server">
                <asp:LinkButton ID="Button2" runat="server" Text="Button2" />
            </asp:View>
        </asp:MultiView>
    </ContentTemplate>
</asp:UpdatePanel>

On the code behind I get the repeater ItemDataBound event, get the control using var button1 = e.Item.FindControl("Button1") as LinkButton; then I assign a CommandArgument with the ID of the current element.

This is being executed immediately after the CreateChildControls method.

Repeater1.ItemDataBound += (s, e) =>
{
    if (e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item)
    {
        var Button1 = e.Item.FindControl("Button1") as LinkButton;
        Button1.CommandArgument = item.ID.ToString();
    }
};

Repeater1.ItemCommand += (s, e) =>
{
    if (e.CommandName == "View")
    {
        var item = provider.Get(Convert.ToInt64(e.CommandArgument));
        BuildSingleView(item);
    }
};

This method just change the view…

public void BuildSingleView(var item)
{
    MyViews.ActiveViewIndex = 1;
    /* Edit
       I've tried to call here
       Initialize(), EnsureChildControls(), CreateChildControls()
       but it was a useless try. I also tried to catch exceptions,
       but none happened.
     */
}

The problem is that the view doesn’t change. When I click the LinkButton it executes the CreateChildControls and after it calls the event ItemCommand, the event calls the BuildSingleView, the ActiveViewIndex is changed but nothing happens on the page.

I don’t understand why it doesn’t change. Is it a problem with the order of events? What could I do to change the view when I click a LinkButton?

---

Here is the full code-behind code (the Initialize method is the method that executes immediately after CreateChildControls) http://pastebin.com/2qwrKNxf

And here the full ascx file http://pastebin.com/P8RSbY9U

Answer 1

I figured out that when the update panel posts back it doesn’t call the event handler first. So in order to get it to execute I need to re-assign the event.

My problem was that the control wasn’t saving the ViewState, so it kept creating the wrong events. I replaced the ViewState with a Session and I got the behavior I wanted.