Why can't you inherit System.Windows.Forms.Form?

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Rob Nicholson - 04 Feb 2006 12:28 GMT

The designer doesn't seem to like it but the question is why was it designed
like this?

Cheers, Rob.

PS. And can you do it in VS 2005?

Reply to this Message

Herfried K. Wagner [MVP] - 04 Feb 2006 13:34 GMT

"Rob Nicholson" <rob.nicholson@nospam_unforgettable.com> schrieb:

> The designer doesn't seem to like it but the question is why was it
> designed like this?

You actually can make a form inherit from 'System.Windows.Forms.Form',
that's what is actually done when adding a new form to the project.

Signature

M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

Reply to this Message

Rob Nicholson - 05 Feb 2006 11:54 GMT

> You actually can make a form inherit from 'System.Windows.Forms.Form',
> that's what is actually done when adding a new form to the project.

But you can't put an intermediate inherited class in the way though. You can
on ASP.NET - we have our own MyApp.Page class which is ineffect the equiv.
of the form.

Cheers, Rob.

Reply to this Message

Herfried K. Wagner [MVP] - 05 Feb 2006 12:09 GMT

"Rob Nicholson" <rob.nicholson@nospam_unforgettable.com> schrieb:

>> You actually can make a form inherit from 'System.Windows.Forms.Form',
>> that's what is actually done when adding a new form to the project.
>
> But you can't put an intermediate inherited class in the way though. You
> can on ASP.NET - we have our own MyApp.Page class which is ineffect the
> equiv. of the form.

You can create a class which inherits from 'Form' and a second class which
inherits from your custom form class ("Project" -> "Add inherited form...").

Signature

M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

Reply to this Message

Rob Nicholson - 10 Feb 2006 01:19 GMT

> You can create a class which inherits from 'Form' and a second class which
> inherits from your custom form class ("Project" -> "Add inherited
> form...").

Ahh ha - that was the missing link. I was simply trying to create a base
class that was normal class, not a form which is then inherited. Works a
treat.

Thanks, Rob.

Reply to this Message

Bob Powell [MVP] - 05 Feb 2006 13:26 GMT

Take a look at the ideas of Visual Inheritance.

Signature

Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.

>> You actually can make a form inherit from 'System.Windows.Forms.Form',
>> that's what is actually done when adding a new form to the project.
[quoted text clipped - 4 lines]
>
> Cheers, Rob.

Reply to this Message

Bruce Wood - 06 Feb 2006 21:06 GMT

> > You actually can make a form inherit from 'System.Windows.Forms.Form',
> > that's what is actually done when adding a new form to the project.
[quoted text clipped - 4 lines]
>
> Cheers, Rob.

Is the "intermediate inherited class" abstract, by any chance?

Reply to this Message

Peter Oliphant - 07 Feb 2006 18:11 GMT

Not sure what you mean. This works, I do it all the time:

ref class MyForm : public Form
{
MyForm() : Form() {}
} ;

even:

ref class MyDerivedForm : public MyForm
{
MyDerivedForm() : MyForm() {}
} ;

Note that 'Form' is 'System.Windows.Forms.Form', but I use 'using' to avoid
excessive typing... : )

[==P==]

> "Rob Nicholson" <rob.nicholson@nospam_unforgettable.com> schrieb:
>> The designer doesn't seem to like it but the question is why was it
>> designed like this?
>
> You actually can make a form inherit from 'System.Windows.Forms.Form',
> that's what is actually done when adding a new form to the project.

Reply to this Message

Patrice - 06 Feb 2006 13:01 GMT

What is the behavior you see ? This is what the designer always do when you
create a form ! Should work.

Signature

Patrice

> The designer doesn't seem to like it but the question is why was it designed
> like this?
>
> Cheers, Rob.
>
> PS. And can you do it in VS 2005?

Reply to this Message

Rate this thread:

Why can't you inherit System.Windows.Forms.Form?

Free Magazines