dotnet windows forms designtime: Hi

I'am developing a Windows Form application (.NET 2.0, VisualStudio 2005 SP1,
Infragistics 2006 suite).
I open my solution (several project and forms, forms are inherit from base
templates) and all works, after i compile my solution, if i try to open any
Form the designer give me this exception:

"Impossibile caricare uno o più tipi richiesti. Per ulteriori informazioni,
recuperare la proprietà LoaderExceptions (in english: Impossible to load
one or more types. For further information, view LoaderExceptions).

in System.Reflection.Module.GetTypesInternal(StackCrawlMark& stackMark)
in System.Reflection.Assembly.GetTypes()
in Microsoft.VisualStudio.Shell.Design.AssemblyObsoleteEventArgs..ctor(Assembly
assembly)
in Microsoft.VisualStudio.Design.VSDynamicTypeService.ReloadAssemblyIfChanged(String
codeBase)
in Microsoft.VisualStudio.Design.VSDynamicTypeService.CreateDynamicAssembly(String
codeBase)
in Microsoft.VisualStudio.Design.VSTypeResolutionService.AssemblyEntry.get_Assembly()
in Microsoft.VisualStudio.Design.VSTypeResolutionService.AssemblyEntry.Search(String
fullName, String typeName, Boolean ignoreTypeCase, Assembly& assembly, String
description)
in Microsoft.VisualStudio.Design.VSTypeResolutionService.SearchProjectEntries(AssemblyName
assemblyName, String typeName, Boolean ignoreTypeCase, Assembly& assembly)
in Microsoft.VisualStudio.Design.VSTypeResolutionService.GetType(String typeName,
Boolean throwOnError, Boolean ignoreCase, ReferenceType refType)
in Microsoft.VisualStudio.Design.Serialization.CodeDom.AggregateTypeResolutionService.GetType(String
name, Boolean throwOnError, Boolean ignoreCase)
in Microsoft.VisualStudio.Design.Serialization.CodeDom.AggregateTypeResolutionService.GetType(String
name)
in System.ComponentModel.Design.DesignerHost.System.ComponentModel.Design.IDesignerHost.GetType(String
typeName)
in System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.EnsureDocument(IDesignerSerializationManager
manager)
in System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager
manager)
in Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager
serializationManager)
in Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.DeferredLoadHandler.Microsoft.VisualStudio.TextManager.Interop.IVsTextBufferDataEvents.OnLoadCompleted(Int32
fReload) "

I close the solution, open VS2005 and all it's ok i can view and modify my
form, i compile the solution, try to open a form and...... the same exception!!


I am terribly frustrated, I don't succeed in resolving this problem.

Thank for any suggestion

Giorgio Parmeggian

Hi Giorgio,

Based on my understanding, you have several WinFoms application projects
which contain some inherited forms. You could open these projects and all
inherited forms without any problem. However, after you compile your
solution, and then open any form in the designer, an exception occurs. If
I'm off base, please feel free to let me know.

To make things clear, I'd like to ask you several questions:

1. You have mentioned 'Infragistics 2006 suite'. Is it a 3rd party
component?

2. > forms are inherit from base templates...
What're the 'base templates'? Are they related to the 'Infragistics 2006
suite'?

3. Are all forms that have the problem inherited from base templates?

In fact, if a form is inherited from a base form, when we open it in the
designer, an instance of the base form is created first and then the
InitializeComponent method of the currently opened form is executed. If we
couldn't open this from in the designer, we may narrow down the problem by
the following steps:

1. Change the base form of the form to be opened to
System.Windows.Forms.Form.

2.Build the project and re-open this form in the designer to see if it
could be opened properly. If no, the problem is at least related to the
code in the InitializeComponent method of the currently opened form;
otherwise, the problem is related to code in the base form.

3. If the problem is at least related to the code in the
InitializeComponent method, you may comment out all code in the
InitializeComponent method and re-open the form to see if it could be
opened correctly. If yes, you may uncomment some of the code in the
InitializeComponent method and re-open the form to see if it could be
opened. Repeat doing this until the form could not be opened correctly and
thus you find the exact code which cause the problem. Correct these code to
ensure the form could be opened properly.

4. Restore the form's previous base form.

5. Comment out all the code in both the base form's constructor and Load
event handler if any. Build the project and re-open the derived form in the
designer to see if it could be opened. If yes, uncomment some of the code
in the base form's constructor or Load event handler, and build the project
again. Re-open the derived form to see if it could be opened. Repeat this
until the derived form couldn't be opened. Then you find the exact code
that cause the problem. You may fix the problem by correcting these code.

You may try my suggestion if it's appropriate to your practice and let me
know the result.

If you have anything unclear, please feel free to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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Hi Linda, thank or your reply

[quoted text, click to view]

Yes it's true

[quoted text, click to view]

Yes is a 3rd party component

[quoted text, click to view]

THe 'base templates' contain Infragistiscs Control: i.e. UltraTextBox or
UltraLabel

[quoted text, click to view]

Yes

I have apply your suggestion and i have discovered that my problem is not
related to the base form but is due to the single form.

I have found a simple example that shows my problem:
If i simply recompile the solution without any any change is all ok, i can
load all forms in the designer
But if i change a class (for example the class 'Library') and recompile my
solution i can not load any forms in the designer.

In my example the structure of my application is: 'FormA' inherit from 'System.Windows.Forms.Form',
'FormA' contain also a UserControl: 'UC1' (but this behavior happens even
if i use a custom control which inherit from 'System.Windows.Forms.Control')
which use the class 'Library', if i change and recompile the class 'Library'
i can not load FormA in my designer.
You have to Notice that 'FormA' and 'UC1' correctly referenced the same 'Library'
class.
I i delete 'UC1' from FormA, the form is correctly loaded!

If i close the solution e reload it in VS2005 'FormA' is correctly loaded
in the designer

Thank in advance

Giorgio Parmeggiani

Perhaps i have found a solution, the 'Library' (and some other classes) class
was converted from 1.1 to 2.0, and the Assembly.info have an old format:
[assembly: AssemblyVersion("1.0.*")].
I have updated it to the new format (fixed the version number): [assembly:
AssemblyVersion("1.0.0.0")]..... and now my problem seems to be resolved!

Giorgi

Hello Giorgio,

[quoted text, click to view]

Sigh! Sigh! Sigh!..... my probem is not resolved i have the same exception :

Hi Giorgio,

Thank you for your detailed feedback.

When a form containing a UserControl is opened in the designer, the code in
the UserControl's constructor and Load event handler if any, will be
executed.

You may have a try commenting out all code in the UserControl's constructor
and Load event handler. Build the project and reopen the form to see if the
problem still exists.

If you could reopen the form without problem, you may use the method of
'commenting and uncommenting' I suggest in my first reply to fix the
problem.

You have mentioned that the class "Library" was converted form .NET 1.1 to
2.0. I think a final try is to create a new class library in .NET 2.0 to
see if it helps.

Hope this helps.


Sincerely,
Linda Liu
Microsoft Online Community Support

Hi Sugandh, Hi Linda

The problem finally seems resolved, at least I hope for it :)

I think that my problem was due to the Library class (converted from 1.1
to 2.0) i have deleted the Library project and created under VS2005.
I have also deleted all "bin" and "object" folders and recompiled my solution.


Now seems all ok, i have changed e and recompiled my solution several times
and nothing happens.

Following the Linda suggestion, i have commented all line in my InitializeComponent()
metod (designer class) and the form is correctly loaded, if i add this line
of code
controlBindingSource.DataSource = _myBusinessClass;
the form is not loaded, i think this was very strange and is not due to the
initialize or load method of a control

[quoted text, click to view]

Thank for your suggestion i will be very useful.

Thank
Giorgio

P.S. Excuse me if i have not been clear but I still find it hard to write
in English ;)

Is there no better solution to this problem?
I think many developers have been suffering from this strange strange
problem, Even I did.

Giorgio,

I use almost all the things you use in my windows forms application..
i.e. infragistics, .net 2.0 and visual studio .net 2005.

And I also used to get bugged by the same problem.

commenting and uncommenting the code will be equally frustrating as closing
and opening the project/solution again.

The point that Linda mentions in her last post that, Constructor and the
Load Method of the control inside your form may be causing the problem is
the right thing.
So, how do you go about avoiding this problem.
Here's is what I suggest...

I suppose you dont write your own code in the control's constructor. If
there is some I think it can be removed and put at the place I suggest you
next.

In all your controls put the code which actually loads the contents on your
control into a method say :-

InitControl() or PopulateControl()

Put the code of constructor and the control1_Load() mehod in this method.

Now, you will need to call this method from the control's parent form
explicitly on some event on the form. Infact, Even if you call this method
from the Form's Load method, you will
get rid of the problem.

Actually, I think you must be making some database calls in load or
something else which the environment is not able to get to when it opens the
form or control in design time, I think its rightly said by Linda in her
first reply that Instance of the Base Form is created, and then the form and
then it goes to the contained control's constructors and load methods.
Remove code from there and it will help.

Hope this help, please reply to me in case you need more clarification.

Sugandh Jain




[quoted text, click to view]

Hi Giorgio,

Thank you for your detailed feedback.

I'm glad to hear that the problem has been solved.

[quoted text, click to view]
_myBusinessClass;
the form is not loaded, i think this was very strange and is not due to the
initialize or load method of a control

I'm not sure but maybe the reason is that it causes other code that breaks
the designer to be executed at design time.

If you have any question in the future, please don't hesitate to contact
us. It's always our pleasure to be of assistance!

Have a nice weekend!

Cheers,

Linda Liu
Microsoft Online Community Support