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You're right. I'm not using the validator as intended. There are plenty of things I can do in a cell data template to get my intended functionality. Thanks for the help. It didn't get me to my original goal, but illuminated the error of my ways and saved me time digging for an answer that doesn't exist.
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Hi,
Is there a free ribbon tool bar? Can I use MS office ribbon control in the siverlight apps?
Best regards,
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There are plenty of free ribbons including one from Microsoft that is going to be a part of .NET 4.5, but you can download it separately for now. Unfortunately, you are going to find that you get what you pay for and that these free ribbons aren't quite as polished and performant as some of the paid ones  . If all you are looking for is the actual ribbon itself without any of the supporting UI elements (color themes, scrollbars, ribbon windows, etc) the Microsoft one will do.
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Here's one I've used. They did an excellent job with it. It has a few minor issues but most all of them can be worked around.
http://fluent.codeplex.com/[^]
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Hello Everyone,
I am not able to capture Automation ID of ITEMS of ListControls such as Combobox,Listbox ,Listview , TreeView.. in QTP for Automation for WPF project.
Can any one tell me how can I get the Automation ID or how can I identify the ITEMS of WPF list controls in QTP Automation TEST since List conrols are being filled dynamically?
Regards,
Ashish
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Hello Everyone,
My WPF application needs to be automated but I do not have assigned AutomationID property to controls.Its in .NET 3.5 and Its very tedious to assign such unique ID to every control.Application will be Automated by QTP.
Is there any short way using which I can assing this unique ID property to all my conrols?
or any way to assign AutomationID property to Conrols?
Regards,
Ashish Parmar
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See if you can use the control key or name instead.
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Since the list/Item conrols are being loaded dynamically, I want to know how do i get AutomationID of these Items in QTP?
QTP is not able to identify these AutomationID..
For Ex: I have a listview which is loaded from datacontext at run time. I am not able to capture items of Listview in QTP.
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This one will be easy, I guess.
Suppose I have a model class, for example Day, with its properties. Then I have DayViewModel, which wraps the Day for viewing, presents some other properties which are not present in the model class (like TimeOfSunset which can be computed, whatever, it's an example).
Then I have Week class, which is a collection of Day objects + additional properties. Then again, WeekViewModel which wraps Week for viewing. I am not doing this automatically - one VM class for each M class, I really need to show Days (in a list maybe), hence the DayViewModel, and I want to show and interact with Weeks, hence the WeekViewModel.
Now to the question. The Week class must include some property like List<Day> Days; which will be populated when the Week is loaded from the data store. But WeekViewModel requires something more like ObservableCollection<DayViewModel>. Now this is awkward, I already have one collection and I need to create another with the same physical data, just to change Day to DayViewModel and List to ObservableCollection. I could live with that but it gets worse. Whenever the WeekViewModel's ObservableCollection gets changed, I must take care to change the Week's List accordingly so that when I save the model classes to the data store, I am sure to have the most recent version.
What is the common way to deal with this simple scenario? I believe that one of the benefits of MVVM is the fact, that several ViewModels can work with one Model just like several Views can work with one ViewModel (correct me if I am wrong). Following this principle, I can't simply use ObservableCollection<DayViewModel> directly in the Week (model) class, because that would tie the Model with one particular ViewModel.
So, is there a better way around this than the one I outlined? I'll be happy to hear your suggestions, H.
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What you could do is something along the lines of
DateViewModel(string Week, ObservableCollection<Days> Days)
Making DateViewModel a class.
I believe this would give you the functionality you are looking for.
Or even possibly
DateViewModel(ObservableCollection<Week> Week, ObservableCollection<Days> Days)
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I see I didn't express myself clearly. It is not really a functionality I am looking for, more like advice on how to deal with the given scenario using MVVM. If I ditch MVVM, I am ok.
Another approach to explaining the question: how to work with two-layer model data in MVVM framework.
As an abstract example - consider a SubItem class (model) and associated SubItemViewModel, then I have Item class (model; containing a collection of SubItems) and associated ItemViewModel. The application works with a collection of Items (we may call this application-level class SuperItemViewModel).
Like I explained in the original post, the model classes consist of ordinary collections of another model classes while the view-model classes contain observable collections of associated view-model classes (this is how I understand MVVM, which may be wrong).
My question is, how to best plug these M and VM classes together while maintaining sufficient separability. That is, in the imaginary Item model class I could directly use ObservableCollection of SubItemViewModels but this, in my understanding, has no place in model classes, which are supposed to be unaware of view-models.
To say it most generally, I think I understand the V-VM part but I don't really get the M-VM part.
Hope I made myself clearer. If not, I may give up this thread and MVVM altogether
Thanks for any suggestions.
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This is where people go wrong with MVVM. Over thinking things. Over engineering things. Why do you need a Day AND a DayModel? A Day IS a DayModel. You should most certainly NOT have a DataProvider that returns a POCO object and then have your UI wrap it in a model type clas. Your DataProvider should return an object that implements INPC in some form.
There is also no such rule that says you have to have 1:1 relationship between M and VM. A VM can most certainly use / expose 2 or 20 M's.
-- modified 14-Oct-11 11:37am.
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If the OP doesn't want a simplified answer, he shouldn't post a simplified question. Its not the forums job to read his mind. Based on what he/she posted, there was nothing about any such restrictions or limitations and I interpreted him/her to be a MVVM newbie who like the rest of us started off a project with the goal of having "perfect" code and seperating everything out "perfectly". It sounded like the OP simply didn't know where to draw the MVVM line in the sand as opposed to constantly down voting people who didn't precisely agree with him.
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Actually, my response was 100% correct given the information the poster gave. Whether he said it was an example or not is irrelevant. He did not indicate that code involved was not his or off limits. Had he responded to my response with that fact, I may have provided a different answer.
For now, I will stand by my response that separating the data layer into a POCO and a M just for the sake of doing so (thinking it is a good separation of duty) is completely un-necessary and completely over-engineered and it would have completely solved his problem of converting between a Day and a DayModel.
Just as I will stand by my other response (that you also down voted) that the use of partial classes is completely proper. If you hate partial classes, well, you better go and explain yourself to Bill Gates (er, Steve Balmer) because pretty much ALL his technologies use them. Winforms, WPF, WCF, ADO.NET, etc.
EDIT: BTW, I gave your post a 3 (should have probably gone lower though) because it was an abuse of technology given the scenario. Use of factories and DI for such a simple problem? Really? Why not go even further and use a remote https server behind a firewall using 512 bit encryption and a separate validation server to ensure the object is valid? 
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Collin Jasnoch wrote: Your respnoce was simply a "You shouldn't do that." Nothing more nothing less.
No explanation other than the claim of over engineering.
Actually, my response was that they should be the same object and not two different ones which would solve the OPs problem. Given the info the OP posted, this was the correct answer.
Collin Jasnoch wrote: So, how are you going to handle a 3rd party controlled model? Or an object that
you control that is used elsewhere and has embedded objects of which are not
INOC?
You make the assumption that the developer controls all aspects. In
reality most patterns (Including MVVM) are created because we can not control
all components. For the few, hey great. Code how you want. For the rest of the
world we follow the patterns for easy transition, upgrades, extensions, testing
etc. etc. etc
Who asked about 3rd party components? Certainly not the OP. Quit making up imaginary scenarios to justify your answer. Until the OP says that he is using 3rd party components that are not designed for MVVM, your point is completely irrelevant to the OPs question.
Where do you get off saying I don't follow design patterns? I certainly do. I don't spend a month implementing a design pattern when a 5 minute "shortcut" will work "for now". I certainly don't write all my code using "shortcuts" or I wouldn't even use MVVM.
Collin Jasnoch wrote: I doubt you have actually implimented a large scale MVVM project. The poster
asked what is the common way to deal with that scenerio (you may want to go back
and look... cause again you did not answer his question. You said he is over
engineering).
Where do you get off saying what I have implemented or not? I'm actually working on a large scale MVVM project right now and yes, I am using 100% proper MVVM with DI, messenger to communicate between views, etc. I use technologies where appropriate. Not to feed my ego like you obviously do.
Collin Jasnoch wrote: You stating it is an abuse of technology is like stating OOP should not be used
in simple apps. If you don't understand that, then it is likely you really don't
understand what DI is.
Lol... you need help bro. Go see a therapist. I certainly know what DI is. In fact, I have personally implemented a DI container. Have you?
Collin Jasnoch wrote: First off, your claim here is insane. Do you really think Gates or Balmer
invented those platforms???
Secondly they use them only in 'AUTO GENERATED
CODE'. The purpose is quite obvious (well atleast to most I guess). If I have
some auto generated code that resides in the same file as that which the
developer is modifying I have a high risk of the developer modifying code that
will be overritten when 'AUTO GENERATED' again. Or it is possible the developer
simple breaks the logic because they do not fully understand the logic flow or
meaning of the code. This was why partial classes were created and this is WHEN
they should be used. Not because you want to EXTEND a class. In fact, there is a
thing called Extensions[^].
In any other case you should be refactoring and
making new objects.
Your mental issues are coming out again. Did I ever claim Gates or Balmer invented WPF? I said that Microsoft uses partial classes everywhere. I'll certainly listen to Microsoft and follow their advice before I listen to you and your insane rants.
Who ever said anything about modifying auto-generated classes? Thats dumb.
Seems like Microsoft disagrees with you, yet again... here... I'll post the link for you so you can read up on partial classes:
http://msdn.microsoft.com/en-us/library/wa80x488.aspx[^]
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Collin Jasnoch wrote: I did not vote on any of your 'Partial Class' posts. I will inform you I voted
for you comment on IValueConvertor
SledgeHammer01 wrote:
In MVVM, IValueConverter and IMultiValueConverter
are very rarely used because the VM does that work.
That is because that statement is completely false.
Maybe in your
applications you have programmed this way, but a small search on google will
show you they deffinately have their place.
Do you not understand the difference between "rarely" and "never".
You should actually read the latest response from the OP in which he clearly states that all your imaginary doom scenarios are not at play, so following your own "don't mislead the OP" rule, I have to down vote you.
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Thank you guys for all replies. No need to argue, really. To clarify a few points: the project which inspired the question is certainly more complex than counting days in a week (it is actually sports related but I came with the example to spare myself the need to explain the particular sport). It is a non commercial activity of mine and I though that one of the benefits would be to get comfortable with the celebrated MVVM. That is why I overthink things, because in this rare case I can afford it, and I can hardly get a thorough understanding by underthinking.
SledgeHammer's reaction was my reasoning exactly - why complicate things with unneccessary model objects when viewmodel alone does all I need with no further complications. But most design patterns have use for model classes, so I thought there must be a "proper" (whatever it means) way to desing the application with model and viewmodel separated. I'll look into factory classes, thanks for the suggestion.
I never said there is 1:1 correspondence between model and viewmodel classes, on the contrary.
I remember now what made me think about the design the way I described. In one article on MVVM (don't know which one, maybe I read too many) someone said that model classes should contain only data that need to be stored in the data store. In particular, data which can be computed should not be present in the model classes but rather in the viewmodel.
Back to my example - if the Day class contains a DateTime information about the time some employee came to work and another DateTime info when the employee left, it is all you need to store. Then my view wants to show how many hours the employee spend working, which can be computed from the data but it is job (I believe/ed) of the DayViewModel to provide this information. That is why I thought I needed both Day and DayViewModel. I got the impression that model classes store data, viewmodel contains all logic and view deals with appearance.
I don't seek perfect code for the sake of it but I can hardly appreciate the benefits of MVVM for large scale applications if I can't successfully use it (with a bit of overkill) even for a small application.
I'll be happy to hear any other suggestions and advice, H.
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I never said you shouldn't use MVVM. On the contrary, I think its great even for small apps once you have a good MVVM framework established. I just said you shouldn't separate the data layer from the model. I'll even toss Colin a bone here and add "unless there is a very good reason to do so". It doesn't seem that you are using any 3rd party components and it seems like you are owning all the code, so there is no reason to do so.
I also never said anything about combining the model and viewmodel. Those should definitely be separate.
The model should implement INPC (or derive from a base class that does) and should handle dealing with the data. I.e. writing to the database, or XML, etc.
The viewmodel should well, I hate to use the word "repackage" because that might give you the impression that you are supposed to repackage the data, which you aren't. Its just a "gateway" from the model to the view. It just presents the data in a way the view can use it. Often times, this is just exposing a collection as a property to get the data to the view. It really doesn't have to be all that complicated. With a few exceptions, most of the VMs I've seen in my life are very simple which is one of the joys of MVVM IMO. If the VM is doing a ton of work in manipulating the data, something is wrong somewhere. The VM also exposes commands that the View can use to manipulate the model, but its just a hook up. The real work of manipulating the models internals belong in the model.
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I am starting to get it now. As I explained, I lived under the impression that model classes should only store data and not contain any means to manipulate them (this belongs to viewmodel). I learned this in some MVVM article, possibly not very good one because you say the direct opposite.
Still it is good to know there are ways to deal with data sources I do not have under my control, so I appreciate Colin's input.
But suppose the UI allows for direct manipulation with the individual Day objects (which are low in the whatever-Week-Day hierarchy). I could implement this by exposing a Manipulate (or something) command in the Day class, but rather in the DayViewModel class, since command handling is the viewmodel's job, right? If so, I am back to square one since I need the Day model class which manipulates the data and the DayViewModel which exposes the manipulation commands. If this is correct that the question still stands, how can the Week model class contain a collection of Day objects if it actually needs DayViewModel objects and thus would have to be tied with one particular viewmodel? If you say to expose the commands directly in the Day class, then I really see no point of VM layer since it would do nothing of any value.
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I have a datagrid and I want to put comboboxes for filtering for each of the columns above the respective columns. I would like the combobox widths to track the width of the specific column they are filtering. I am trying to bind the combobox width to the actual width of the datagrid column but it doesn't seem to work. What am I doing wrong?
Thanks,
Preston
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<ComboBox Width="{Binding FirstColumn.ActualWidth}"></ComboBox>
<DataGrid Grid.Row="1">
<DataGrid.Columns>
<DataGridTextColumn x:Name="FirstColumn"
MinWidth="180"
Header="First Column"></DataGridTextColumn>
<DataGridTextColumn x:Name="SecondColumn"
MinWidth="180"
Header="Second Column"></DataGridTextColumn>
</DataGrid.Columns>
</DataGrid>
</Grid>
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Thanks Collin, that worked great for setting the width but now I need to make the location line up with the start of the datagrid column. How can I do that? I don't see a property that I can bind to for that purpose.
I think I have figured out how to do that. If I just wrap the comboboxes in a horizontal wrap panel that does the trick. Thanks again for the help.
modified 13-Oct-11 17:13pm.
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It looks like I may have spoken too soon. Binding my comboboxes to the ActualWidth of the dataGrid columns they should be above works great until I try to change the size of the app from full screen. Then I get DependencyProperty.UnsetValue is not a valid value for property 'Background' error.
I commented out the comboboxes and thought it had fixed the problem but once I grabbed the corner of the non maximized app and resized it gave the error again. So I guess it has something to do with my dataGrid.
Update: I found that the problem was in the one of the styles on the datagrid. Problem solved.
Thanks,
Preston
modified 14-Oct-11 16:03pm.
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I am creating a WPF ComboBox for a WPF Windows application dynamically. However, when I build a list of a class object with 2 items in the list and bind to the combobox, I see records in the combobox but do not see any text displayed. I am setting the DisplayMemberPath appropriately I think. Any ideas?
Class AnswerChoice
Public AnswerChoiceID As Integer
Public AnswerChoice As String
End Class
Private Function GetAnswerChoices() As List(Of AnswerChoice)
Dim lstAnswerChoices As New List(Of AnswerChoice)
Dim objAnswerChoice As AnswerChoice
objAnswerChoice = New AnswerChoice
objAnswerChoice.AnswerChoiceID = 1
objAnswerChoice.AnswerChoice = "Answer Choice One"
lstAnswerChoices.Add(objAnswerChoice)
objAnswerChoice = New AnswerChoice
objAnswerChoice.AnswerChoiceID = 2
objAnswerChoice.AnswerChoice = "Answer Choice Two"
lstAnswerChoices.Add(objAnswerChoice)
Return lstAnswerChoices
End Function
Dim ctrlComboBox As New ComboBox()
ctrlComboBox.Width = 300
ctrlComboBox.HorizontalAlignment = Windows.HorizontalAlignment.Left
ctrlComboBox.Name = "cboBox"
ctrlComboBox.ItemsSource = GetAnswerChoices()
ctrlComboBox.DisplayMemberPath = "AnswerChoice"
ctrlComboBox.SelectedValuePath = "AnswerChoiceID"
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You need to make your fields in Class AnswerChoice Properties like this
Dim intAnswerChoiceID As Integer
Public Property AnswerChoiceID As Integer
Get
Return intAnswerChoiceID
End Get
Set(ByVal value As Integer)
intAnswerChoiceID = value
End Set
End Property
Dim strAnswerChoice As String
Public Property AnswerChoice As String
Get
Return strAnswerChoice
End Get
Set(ByVal value As String)
strAnswerChoice = value
End Set
End Property
My advice also would be to use an ObservableCollection rather than a List to store your collection, as it notifies your UI if there are any changes to the collection.
Hope this helps
When I was a coder, we worked on algorithms. Today, we memorize APIs for countless libraries — those libraries have the algorithms - Eric Allman
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