Web UserControl inheritance

[Ivan A. Vasilyev]

Hello.

Could anyone please clarify one thing.

Suppose I have to classes:
1. A inherits UserControl
2. B inherits A

BOTH A AND B HAVE HTML MARKUP IN RELATED ASCX FILES.

Then suppose I want to instantiate control B. I have three options:
1. Propgrammatically instatiate B through new B();
2. Propgrammatically instatiate B through LoadControl("B.ascx");
3. Declare control B in ASPX/ASCX of a container and refer B in code-behind
file of a container.

The quiestion is the following: Which of instantiation options are correct
to use?

I've tried (3) but it seems that html markup (in ASCX) of class A isn't
being parsed, so those children of A (from ASCX) are not being created.

TIA

 

[Teemu Keiski]

Hi,

ascx files aren't in the inheritance chain (assuming if I understand your
scenario correctly). If you put B to derive from A, it means B derives from
code-behind class of A, not the A.ascx being parsed through normal ASP.NET's
mechanisms (it is parsed dynamically or via Page.ParseControl/LoadControl
etc)

I think master pages would be closer solution to this.

 

[Ivan A. Vasilyev]

Hello

Thanx for the answer.
I need to extend some ascx-based user control. So i think composition
(insted of inheritance) is the only way to go.

 

[Teemu Keiski]

Sorry for delay, one way also is to put the layout/controls of the parent UC
to be created in code. That way it is inherited.

 

[Ivan A. Vasilyev]

I have to avoid changing parent user control. But thanx anyway WBR.