The question is why does the null reference occur for the observable collection? The error occurs when I try to add item to the obscollection.
Using MVVM, one type of ViewModels include the Model they represnt as a Field. So I do have a CompanyModel and a CompanyViewModel that has one instance of CompanyModel.
It seems to be a simple problem, but I can\'t get it to work. I have a UserControl with the following property:
I\'m creating a UserControl which will be used in various scenarios.I need to expose a collection of strings from the UserControl and I\'m not sure how to do it.
I have a self-referencing hierarchy that is a Ria Entity. I place the entities into an ObservableCollection and bind the collection to my TreeView. Everything works as expected, except when I add an e
I have (I thought) a fairly conventional WPF app. I\'ve <ListBox ItemsSource=\"{Binding MyList}\" ...
I have a wpf-mvvm application. I have an observable collection in my viewmodel public ObservableCollection<BatchImportResultMessageDto> ImportMessageList { get; set; }
I am just starting out with WPF and am trying to understand data binding. In my project I have a listbox bound to a property, which gets/sets from a DependancyProperty.
I use a dependency property of type ObservableCollection<> in my control. I want to automatically change content display in my control while editing XAML code. I write such a code:
i found a piece of code that use ObservableCollection but they can use list or any other collection related cla开发者_开发百科sses. can anyone tell me what is the benifit of using ObservableCollection
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