ASP.NET custom server control: nested items

Question

In the aspx code view, we can code like this:

<asp:ListBox runat="server">
    <asp:ListItem Text="Item1" />
    <asp:ListItem Text="Item2" />
</asp:ListBox>

However, the ListItem class is not a server control. How could we do that in our custom server control? That is, how to develop a ListItem-like class which can make this markup style works? I'm building a server control which is similar to the ListBox.

Thanks:)

How could you do what exactly? I don't understand what the problem with this is. — Matti Virkkunen
– Matti Virkkunen, Commented Apr 6, 2010 at 9:35
My guess is that he wants to implement this with his own controls. Like this: <custom:Parent ID="MyCustomParent" runat="server"><custom:Child ID="MyCustomChild1" runat="server" /><custom:Child ID="MyCustomChild2" runat="server" /></custom:Parent> — Kristof Claes
– Kristof Claes, Commented Apr 6, 2010 at 9:42

Brian Mains · Accepted Answer · 2010-04-06 11:55:47Z

1

Create a class that inherits from ListControl, for various reasons, even this may not give you complete UI intellisense for this (something about the way the designer works with custom assemblies), but it will support adding list items and manage that all for you.

answered Apr 6, 2010 at 11:55

Brian Mains

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Mouhong Lin Over a year ago

@Brian Actually, I'm developing a tree control, but for some reason, I should not make it derive from TreeNode, let alone the ListControl. The example in the post is just for simplifying the complexity of the ploblem. :)

Paulo Santos · Accepted Answer · 2010-04-06 10:06:20Z

0

If you want to do such thin with your control you need to implement a Control Designer.

Edited to add:

And also check the ParseChildren, PersistChildren, DesignerSerializationVisibility, and PersistenceMode attributes.

edited Apr 6, 2010 at 10:06

answered Apr 6, 2010 at 9:41

Paulo Santos

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3 Comments

Mouhong Lin Over a year ago

Hi, is there a simple way(for example, I only need to apply some attributes to the properties or types) to make it work in code view? I don't need the complete designer support. Thanks:)

Paulo Santos Over a year ago

@Dylan use the DesignerSerializationVisibility and PersistenceMode attributes on the necessary property.

Mouhong Lin Over a year ago

I used [PersistenceMode(PersistenceMode.InnerProperty)] and [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)] on the ListItems(a collection) property of ListBox control in question. And I got the intellisence, but when I compile the code(calling code), the compiler said: Type 'ListItemCollection' does not have a public property named 'ListItem'.

bresleveloper · Accepted Answer · 2014-08-11 13:01:23Z

0

protected override void RenderContents(HtmlTextWriter output)
        {

            output.Write("<div><div class=\"UserSectionHead\">");

            Label l = new Label() { Text = Label };
            TextBox t = new TextBox() { Text = Text };
            l.AssociatedControlID = t.ID;
            l.RenderControl(output);

            output.Write("</div><div class=\"UserSectionBody\"><div class=\"UserControlGroup\"><nobr>");

            t.RenderControl(output);

            output.Write("</nobr></div></div><div style=\"width:100%\" class=\"UserDottedLine\"></div>");

        }

answered Aug 11, 2014 at 13:01

bresleveloper

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