ASP.NET custom control, can template fields have attributes? - asp.net

Question

For example:
<uc:AdmiralAckbar runat="server" id="myCustomControl">
<Warning SomeAttribute="It's A Trap">
My Data
</Warning>
</uc:AdmiralAckbar>
I'm not sure how to add SomeAttribute. Any ideas?
Code without the attribute is:
private ITemplate warning = null;
[TemplateContainer(typeof(INamingContainer))]
[PersistenceMode(PersistenceMode.InnerProperty)]
public ITemplate Warning
{
get
{
return warning;
}
set
{
warning = value;
}
}

Answer 1

The answer is yes.
For this you should create a type which implements ITemplate interface and add a custom property/properties there (I added property Name in my example); also add a class which inherits from Collection<YourTemplate>.
Here is an example of doing that:
public class TemplateList : Collection<TemplateItem> { }
public class TemplateItem : ITemplate
{
public string Name { get; set; }
public void InstantiateIn(Control container)
{
var div = new HtmlGenericControl("div");
div.InnerText = this.Name;
container.Controls.Add(div);
}
}
and a control itself:
[ParseChildren(true, "Templates"), PersistChildren(false)]
public class TemplateLibrary : Control
{
public TemplateLibrary()
{
Templates = new TemplateList();
}
[PersistenceMode(PersistenceMode.InnerProperty)]
public TemplateList Templates { get; set; }
protected override void RenderChildren(HtmlTextWriter writer)
{
foreach (var item in Templates)
{
item.InstantiateIn(this);
}
base.RenderChildren(writer);
}
}
and finally an example of usage:
<my:TemplateLibrary runat="server">
<my:TemplateItem Name="hello" />
<my:TemplateItem Name="there" />
</my:TemplateLibrary>
BTW, you could also use it as:
<my:TemplateLibrary runat="server">
<Templates>
<my:TemplateItem Name="hello" />
<my:TemplateItem Name="there" />
</Templates>
</my:TemplateLibrary>
the effect will be the same.