Question

I’m just getting started with Custom User Controls in C# and I’m wondering if there are any examples out there of how to write one which accepts nested tags?

For example, when you create an asp:repeater you can add a nested tag for itemtemplate.

Answer 1

I wrote a blog post about this some time ago. In brief, if you had a control with the following markup:

<Abc:CustomControlUno runat='server' ID='Control1'>     <Children>         <Abc:Control1Child IntegerProperty='1' />     </Children> </Abc:CustomControlUno> 

You’d need the code in the control to be along the lines of:

[ParseChildren(true)] [PersistChildren(true)] [ToolboxData('<{0}:CustomControlUno runat=server></{0}:CustomControlUno>')] public class CustomControlUno : WebControl, INamingContainer {     private Control1ChildrenCollection _children;      [PersistenceMode(PersistenceMode.InnerProperty)]     [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]     public Control1ChildrenCollection Children     {         get         {             if (_children == null)             {                 _children = new Control1ChildrenCollection();             }             return _children;         }     } }  public class Control1ChildrenCollection : List<Control1Child> { }  public class Control1Child {     public int IntegerProperty { get; set; } }