I have derived a class from UserControl and added severl methods and properties that are common through my entire C# project. After disigning the layout for most of my UserControls, I altered the code to use my new class as the base class.

The problem is this....even though I derrived my class from the original base class (UserControl), the designer is no longer rendering my controls when I open them. Is there any way to fix this?

If so, any and all help would be appreciated.

(Not sure if this is the correct forum, so if I need to move it, please let me know).

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Eric

Do you have one:


? Or do you have several:


? If you have the latter, the UserControl designer is lost and therefore what you describe is probably normal.

Or did I misunderstand?

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MCP

I have about 25 controls that all share some common functionality in them. I declared a base class similar to this:

public class MyBaseClass : UserControl
{

}

I then derrive all of my controls as follows:

public class MyControl1 : MyBaseClass
{

}

Is this incorrect? The designer is no longer able to render MyControl1

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Eric

OK, yes. That seems about right.

Now, what exactly is your problem? Is it your problem that your controls derived from MyBaseClass are not showing or drawing in the surface of a form? Or is it your problem that your controls derived from MyBaseClass do not show a designer similar to the UserControl designer (one where you can drag controls to it and position them, etc.)?

If it is the latter, check out this post: http://social.msdn.microsoft.com/Forums/en-US/winformsdesigner/thread/55a561bd-b22a-486d-b8d8-59f6612bb317.

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MCP

I am using Visual Studio 2008. The error I get is as follows:

To prevent possible data loss before loading the designer, the following errors must be resolved: 1 Error Why am I seeing this page?

The designer could not be shown for this file because none of the classes within it can be designed. The designer inspected the following classes in the file: TransferItems --- The base class 'AII.Pioneer.Client.Device.PioneerControlParent' could not be loaded. Ensure the assembly has been referenced and that all projects have been built.

I hope this gives you sufficient information. In this case, PioneerControlParent is my base class that derives from UserControl.

Thanks!

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Eric

You have an error in your code that is preventing the operation to complete. Debug the design-time behavior of your user controls before moving on.

To do this, you debug devenv.exe itself (another instance of Visual Studio).

http://msdn.microsoft.com/en-us/library/5ytx0z24%28VS.80%29.aspx

And set a designer to your base class to be the designer of the UserControl. Like the URL in my previous post shows.

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MCP

I think part of my issue is that I am build an app for a mobile device. I referenced the link you provided, and it looks like using an attribute for the base class may work. The problem is that I do not have access to the [Designer....] attribute in the .NETCF.

I may be stuck simply designing all the screens first, then changing my base class to my custom base class.

If you have any other ideas, I'd love to hear them.

Thanks

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Eric

Hi Eric Crammer,

> I am build an app for a mobile device.

Do you mean the project is a Windows Mobile project? Windows Mobile project is quite different from Windows Forms project. If it is a Windows Mobile project, you’ll need to post the question on Smart Device Development forum.

Thank you for your understanding.

Sincerely,

Kira Qian

Send us any feedback you have about the help from MSFT at fbmsdn@microsoft.com

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Hi Eric. Unfortunately, I have no experience with mobile devices. You should follow Kira's advise on this one.

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MCP