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  • Should I have one dll or multiple for Business Logic?

    - by Brian
    In my situation, my company services many types of customers. Almost every customer requires their own Business Logic. Of course, there will be a base layer that all business logic should inherit from. However, I'm going back and forth on architecting this--either in one dll for all customers or one dll for each. My biggest point of contention deals with upgrading the software. We have about 12 data entry personnel that work with 20 companies and it's critical that they have little down time. My concern is that if I deploy everything in one dll, I could introduce a bug in company A's logic while only intending to update Company B's logic. I believe I could reduce the risk if each company's logic had their own dll, so then, I could deploy Company B's update w/o harming Company A's. -- I will be the only one supporting this. That said, this also seems like a nightmare to manage 20 different .dll's -- that's for the BLL alone. I also need to create a View layer and ViewModel layer. So, potentially, I could have 20 (companies) * 3 (layers) which would equate to 60 .dll's. Thank You.

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  • Sharing state/changes across ViewModels

    - by joshperry
    I have an App which has a Tasks tab and a Projects tab. I decided to make a separate ViewModel for each of the tabs, TasksViewModel and ProjectsViewModel. The Tasks tab has a new task area with an associated project pulldown and the Projects tab (obviously) has a list of projects. What I'd like is for the pulldown on the Tasks tab to share the same collection as the Projects tab list so that any time I add or remove a project on the Projects tab the list on the Tasks tab is up to date automatically. This worked well with a single ViewModel but it was beginning to become quite unruly. Should I not have split into two ViewModels? Is there a common method of sharing data like this? Perhaps pass the same ObservableCollection<Project> into each of the ViewModels? Perhaps some type of notification back to the TasksViewModel along the lines of ICollectionChanged. Appreciate any insight/input!

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  • WPF TextBox value doesn't change on OnPropertyChanged

    - by jpsstavares
    I have a TextBox whose Value is binded to a ViewModel property: <TextBox Name="txtRunAfter" Grid.Column="4" Text="{Binding Mode=TwoWay, Path=RunAfter}" Style="{StaticResource TestStepTextBox}"/> The set and get were working fine until I tried to add some validation when the Value is set: private int _runAfter = 0; public string RunAfter { get { return _runAfter.ToString(); } set { int val = int.Parse(value); if (_runAfter != val) { if (val < _order) _runAfter = val; else { _runAfter = 0; OnPropertyChanged("RunAfter"); } } } } Although the OnPropertyChanged is reached (I have dubugged that), the View is not changed. How can I make this work? Thanks, José Tavares

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  • How to restrict focus in textbox

    - by Ashish Singhal
    I have a dialog with few controls. There is a TextBox named txtControl and two Buttons Accept and Cancel. I want that once the focus is in txtControl, the focus should not go away, until I click on Accept or Cancel button. If I try to click on any other control without clicking on Accept or Cancel button, then focus should remains in txtControl. Also I don't want to disable or gay out other controls.

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  • INotifyPropertyChanged Setter Style

    - by Ivovic
    In order to reflect changes in your data to the UI you have to implement INotifyPropertyChanged, okay. If I look at examples, articles, tutorials etc most of the time the setters look like something in that manner: public string MyProperty { //get [...] set { if (_correspondingField == value) { return; } _correspondingField = value; OnPropertyChanged("MyProperty"); } } No problem so far, only raise the event if you have to, cool. But you could rewrite this code to this: public string MyProperty { //get [...] set { if (_correspondingField != value) { _correspondingField = value; OnPropertyChanged("MyProperty"); } } } It should do the same (?), you only have one place of return, it is less code, it is less boring code and it is more to the point ("only act if necessary" vs "if not necessary do nothing, the other way round act"). So if the second version has its pros compared to the first one, why I see this style rarely? I don't consider myself being smarter than those people that write frameworks, published articles etc, therefore the second version has to have drawbacks. Or is it wrong? Or do I think too much? Thanks in advance

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  • Data-binding taking to long to update

    - by Justin
    In my application I have this code in my view model: hiddenTextContainer.PreHideVerticalOffset = VerticalOffset; hiddenTextContainer.HiddenText = Text.Remove(SelectionStart, SelectionLength); hiddenTextContainer.HasHiddenText = true; hiddenTextContainer.NonHiddenTextStart = SelectionStart; Text = Text.Substring(SelectionStart, SelectionLength); SelectionStart = Text.Length; hiddenTextContainer.ImmediatePostHideVerticalOffset = VerticalOffset; This code is used to hide selected text in a textbox. Text is a string property data bound to the text property of a textbox and VerticalOffset is a double property data bound to the VerticalOffset property of that same textbox. I need to save the VerticalOffset before and after the hiding of selected text takes place, but with my code below both hiddenTextContainer.PreHideVerticalOffset and hiddenTextContainer.ImmediatePostHideVerticalOffset are always set to the same value no matter what. I have figured out that this is because the text of the textbox has not been updated by the time the code reaches: hiddenTextContainer.ImmediatePostHideVerticalOffset = VerticalOffset; Is there any way I can fix this?

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  • RelayCommands overriding the "IsEnabled" of my buttons.

    - by vidalsasoon
    RelayCommands overriding the "IsEnabled" of my buttons. Is this is a bug? Here is xaml from my View and code from my ViewModel <Button Grid.Column="0" Content="Clear" IsEnabled="False" cmd:ButtonBaseExtensions.Command="{Binding ClearCommand}" /> public RelayCommand ClearCommand { get { return new RelayCommand(() => MessageBox.Show("Clear Command")); } } Notice I hardcoded the IsEnabled="False" in my xaml. This value is completely ignored (button always enabled). I realize that RelayCommand have a CanExecute overload but I did want to use this as I want to do more than just have a disabled button.

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  • A viewmodel's role beyond databinding?

    - by DeanMc
    I'm a bit confused as to what a viewmodel's role is beyond databinding. I have a menu built in silverlight. The menu has x number of menu items which is determined at runtime. One of the features I would like to add to this is that each menuitem has a different text colour when hovered over. Is it the role of the view to have a colour selector method or should the view handle this in it's code behind?

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  • Caliburn.micro View ViewModel name resolution issue

    - by user1459773
    I am using a namespace called ComShorCaliburnWPF.ViewModules.Views.ShortMenuWindows.GWDSCT on my View.xaml and View.cs, for my ViewModel.cs and my IoC container I am using ComShorCaliburnWPF.ViewModules.Views.ShortMenuWindows.GWDSCT. When I remove the GWDSCT at the end it works fine, but in its current state it does not. I would like it to work how it is now because it accurately reflects where the files are located. Any suggestions?

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  • Bind event in custom WPF control to command in ViewModel

    - by Jon Archway
    Hi, I have a custom control that has an event. I have a window using that custom control. The window is bound to a viewmodel. I would like to have the event from the custom control direct to an ICommand on my viewmodel. I am obviously being dense here as I can't figure out how to do this. Any assistance is most welcome. Thanks

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  • How can I incorporate a data bound list of MenuItems to another MenuItem in WPF?

    - by Julien Poulin
    I have a 'File' MenuItem were I would like to display a list of recently opened files. Here is the xaml I have now: <MenuItem Header="File}"> <MenuItem Header="Preferences..." Command="{Binding ShowOptionsViewCommand}" /> <Separator /> <ItemsControl ItemsSource="{Binding RecentFiles}"> <ItemsControl.ItemTemplate> <DataTemplate> <MenuItem Header="{Binding DisplayPath}" CommandParameter="{Binding}" Command="{Binding Path=DataContext.OpenRecentFileCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}}"> </MenuItem> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> <Separator /> <MenuItem Header="Exit" Command="{Binding CloseCommand}" /> </MenuItem> However, when I use this code, there is a weird offset around the MenuItems and it looks like there is a container around them. How can I get rid of that? Here is a screenshot of what it looks like:

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  • How to bind Listbox to two properties?

    - by Gabriel
    I have in Silverlight a Grid with DataContext set to class ViewModel. ViewModel contains list of items (each of them containing int ID and string Text) and an integer "ID", which identifies actually active item (not selected item). I would like to construct xaml with ListBox where activated item has another color. How can I do it?

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  • Passing Services to MainViewModel - SHOULD I use a dependency injection container ?

    - by msfanboy
    Hello, I have this code: public partial class App : Application { protected override void OnStartup(StartupEventArgs e) { base.OnStartup(e); var mainVM = new MainViewModel ( new Service1(), ... new Service10(), ); var window = new MainWindow(); window.DataContext = mainVM; window.Show(); } } I pass all my Services instances to the MainViewModel. Within the MainViewModel I spread those services to other ViewModels via constructor parameter passing. Should I use any DI framework for the services in the App class? If yes whats the benefit of resolving the services instead of just creating the instance manually... ?

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  • Silverlight and MV(VM) Pattern - No Code-Behind - Is this possible?

    - by user118190
    I am working on Silverlight 3.0 and currently using code-behind in my Views. I would like to implement the MV(VM) pattern into my project as the project is growing. I have seen some WPF projects where the code-behind has NO CODE except for the InitializeComponent method, which I believe is the right way to go and just looks clean. Is this possible in Silverlight 3.0, that is, no code-behind? Can anyone point me to some good Silverlight (3.0) MV(VM) tutorials / articles?

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  • Silverlight and M-V-VM - Where should a timer live?

    - by Bill Jeeves
    I'm creating a simple monitoring tool in Silverlight. It talks to a web service to retrieve the status information and store it in the ViewModel. This needs to happen once per minute so I'm going to add a timer for this purpose (probably a DispatcherTimer). My question is, where should the timer go in an M-V-VM architecture? In the ViewModel or the View?

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  • Parent and child model interaction

    - by jminarik
    Hi, is it possible set something like wpf window owner in caliburn.micro ? I have PARENT VIEW MODEL, from this model I open CHILD SCREEN {VIEW MODEL} with this method: public IEnumerable<IResult> Open() { yield return new ShowWindow("ChatScreen") .InitializeWith(_service .DetailData(Account, _selectedFriend.Value.Nick), AvatarImage); } This method create a new WPF WINDOW - CHILD SCREEN and initialize CHILD VIEW MODEL with some variables. I would like set something like this CHILD_SCREEN.PARENT = PARENT_VIEW_MODEL. I would like achieve if I close PARENT VIEW MODEL that it close also all CHILD MODELS. Also it exist way how can I check if screen, in my situation WPF window, is active/inactive from MAIN VIEW MODEL?

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  • Handling exceptions in Prism 4 modules

    - by marcellscarlett
    I've gone through a number of threads here about this topic with no success. It seems that in the App.xaml.cs of our WPF application, handling DispatcherUnhandledExceptions and AppDomain.CurrentDomain.UnhandledException don't catch everything. In this specific instance we have 7 prism modules. My exception handling code is below (almost identical for UnhandledException): private void OnDispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e) { try { var ex = e.Exception.InnerException ?? e.Exception; var logManager = new LogManager(); logManager.Error(ex); if (!EventLog.SourceExists(ex.Source)) EventLog.CreateEventSource(ex.Source, "AppName"); EventLog.WriteEntry(ex.Source, ex.InnerException.ToString()); var emb = new ExceptionMessageBox(ex); emb.ShowDialog(); e.Handled = true; } catch (Exception) { } } The problem seems to be the unhandled exceptions occurring in the modules. They aren't caught by the code above and they cause the application to crash without logging or displaying any sort of message. Does anyone have experience with this?

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  • Should I use ObservableCollections in my Model in M-V-VM

    - by Bill Jeeves
    I'm completely new to M-V-VM and very new to Silverlight, just reading about it for the first time today. As a sample, I am creating a model containing a list of items. My (Silverlight 4) View contains a listbox and my ViewModel will look to the model to retrieve the collection that the listbox will bind to. My question is this. I think it would be good to use an ObservableCollection to hold the items that the listbox binds to. This would be an ObseravleCollection in the ViewModel. Should I also use this type of collection in the model, or should I use another collection type and do smoe conversion between model and viewmodel?

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  • How do I link (dependency) properties in my ViewModel?

    - by mos
    Simplified example: I have an object that models a user. Users have a first name and a last name. The UserViewModel has a dependency property for my Models.User object. In the declaration of the UserView's xaml, I want to bind a couple of TextBlocks to the first and last name properties. What is the correct way to do this? Should I have readonly DependencyProperties for the name fields, and when the dependency property User is set, update them? Can the name fields be regular C# properties instead? Or, should I bind like this: <TextBlock Text="{Binding User.FirstName}" />

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  • I can not navigate to the next page in windows phone 7

    - by Vijay
    I am trying to navigate form one page to another page depends upon the login. If already user logged in, Welcome page should open. Else Log in Page should open. I am trying like this. The Splash Page is the start up page. This is a Splash Screen Xaml.cs: namespace NewExample.Views { public partial class SplashPage : PhoneApplicationPage { public SplashPage() { InitializeComponent(); this.DataContext = new SplashPageViewModel(); } } } This is Splash Screen View Model: Here I am check the user already logged in or not. namespace NewExample.ViewModel { public class SplashPageViewModel { public static bool isLogin = false; public SplashPageViewModel() { var rootFrame = (App.Current as App).RootFrame; if (isLogin) rootFrame.Navigate(new Uri("/Views/WelcomePage.xaml", UriKind.Relative)); else rootFrame.Navigate(new Uri("/Views/LoginPage.xaml", UriKind.Relative)); } } } But it is not working. The Splash Page only showing. This is not navigating to another page. Please help me to resolve this problem.

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  • WPF/C# - Sometimes my dropdowns/datepickers will stop functioning?

    - by BlargINC
    Q: Where should I check to track this down? Issue: Opening a view model in my application sometimes makes dropdowns/datepickers nonfunctional. ie. dropdown won't drop and the datepicker calendar won't come up I suspect a binding issue but don't see one. Dropdowns have normal things like strings, numbers. One drop has a list of mini views. Datepickers are bound to nullable dates set in the constructor of the viewmodel. Note: These same things work in other viewmodels/views. I can paste code, I'm just not sure what code is relevant here. Thank you for helping me :)

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  • Sometimes my dropdowns/datepickers will stop functioning?

    - by BlargINC
    Q: Where should I check to track this down? Issue: Opening a view model in my application sometimes makes dropdowns/datepickers nonfunctional. ie. dropdown won't drop and the datepicker calendar won't come up I suspect a binding issue but don't see one. Dropdowns have normal things like strings, numbers. One drop has a list of mini views. Datepickers are bound to nullable dates set in the constructor of the viewmodel. Note: These same things work in other viewmodels/views. I can paste code, I'm just not sure what code is relevant here.

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