![]() Public ObservableCollection Children įrom the context menu we can refer to the element where it is set by using PlacementTarget.įrom the element that contains the context menu we can access the window which was bound to the Tag property.Īnd finally from the window access our command. But it seems to mee you do not need TreeView at all. (TargetType for the commands would be ICommand). Inside TreeView.Resources you could declare several DataTemplates with different DataType if Delete and Open commands were items of some collection. To bind in a TreeView you can have a ObservableCollection with your items and in the object you are binding you can have another ObservableCollection which will be a collection with all the child nodes. Here is one of the best articles about TreeView I ever read. You can tell it to bind elements and also how it should bind the children, grandchildren and so on. I just want to go with latter one, since you can understand ValueConverter also.TreeView control allows you to create an hierarchical structure. I can do this either by String format in binding or else ValueConverter. Say for example in my project, the Joining date is date time value but I need to display only date. We might often get some values from the property but we have to display some other value in the View. In resources, I am adding a reference to my ViewModel and DateTimeToDateConverter. If you see the above XAML code, you can see I am using Windows resources in my view. Since WPF doesn't support GridView directly, I am using a ListView. ![]() Many people can wonder why I am using ListView. I have used a window, Grid, Textbox, Textblock, Button, List View and GridView. The code for the view can be found below. Now we have to create a view and bind it with ViewModel properties. private readonly Predicate _canExecute.public event EventHandler CanExecuteChanged.return _canExecute = null ? true : _canExecute(parameter).public bool CanExecute( object parameter).throw new ArgumentNullException( "execute" ).public Rela圜ommand(Action execute): this (execute, null ).Rela圜ommand is a simplified variation of the DelegateCommand. ![]() This approach allows for terse, concise command implementation in ViewModel classes. ![]() The Rela圜ommand allows you to inject the command's logic via delegates ed into its constructor. Since we are following the MVVM pattern, instead of having a Button click event in code behind, we are going to use the Command Property of the button. void Students_CollectionChanged( object sender, 圜ollectionChangedEventArgs e).//Whenever new item is added to the collection, am explicitly calling notify property changed.Students.CollectionChanged += new 圜ollectionChangedEventHandler(Students_CollectionChanged)._SubmitCommand = new Rela圜ommand(param => this.private ObservableCollection _students.The important areas covered are MVVM, using Relay Command and IValueConverter. Here I am just going to get a student name and age from the user and display the details in a GridView as in the figure. Separates UX designer and developer i.e the development team can focus on creating ViewModel classes, and the design team can focus on making user-friendly Views.Very minor changes required in ViewModel to support changes in View.No need to change model to support changes in View.Supports rich online media such as streaming audio, video. Sub-set of WPF and can be used only in web applications.ĭifference between WPF and Silverlight S.No.Commonly referred as a rival to Adobe Flash.Cross-platform, cross-browser platform for delivering rich, interactive applications.Supports media, documents and graphics.Next generation of Windows applications / Winforms.Short form for Windows Presentation Foundation.Before starting with the project let me explain about WPF, Silverlight and MVVM for those who are new to those areas.
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