![wpf mvvm treeview example wpf mvvm treeview example](https://www.codeproject.com/KB/WPF/390514/NavTrees2.jpg)
If you're not familiar with interfaces, perhaps simply a DAL class is a good way to start. I do this to allow for Blendability, aka design time data. I generally create a service interface (note: not a class, but an interface) that defines the methods my DAL (data access layer) will have. In your UserControl, you'd put something like this in the declaration: DataContext="" (instead of in the constructor of your view, for example).Īdd this ViewModel to your ViewModelLocator (I use the mvvmlocatorproperty code snippet provided in MVVM Light).īind your View to the ViewModel using the Locator. Initializing an instance of the classes you created would go here. Your ObservableCollections would sit here. This is where you'd have your properties that you're binding to in your veiw. This means abstracting out your data access layer (more below).Ĭreate your ViewModel.
![wpf mvvm treeview example wpf mvvm treeview example](https://www.dotnetcurry.com/images/xamarin/mvvm/mvvm-schema.png)
I generally use POCO's, simply defining the properties of a model. So, to convert this to MVVM you need to do a few things.Ĭreate defined Models.
![wpf mvvm treeview example wpf mvvm treeview example](https://i.stack.imgur.com/Y7w30.png)
On the assumption that you're using MVVM Light (you can extrapolate from this if you're using another toolkit). implement the INotifyPropert圜hanged interface). My first recommendation would be to drop in an MVVM toolkit, as it's easier than having to do everything yourself (e.g. ObservableCollection items = new ObservableCollection() įavoriteFolder fdr = new FavoriteFolder() Report Items: public class FavoriteReportĪnd the – public partial class MainWindow : Window Sql = "SELECT * FROM tbl_reports where rpt_folder_id =" + _folderID įavoriteReport report = new FavoriteReport() SqlDataReader reader = cmd.ExecuteReader() įavoriteFolder folder = new FavoriteFolder() įolder.FolderID = reader.ToString() įolder.FolderTitle = reader.ToString() įolder.ParentID = reader.ToString() SqlCommand cmd = new SqlCommand(sql, cnn) String sql = "SELECT * FROM tbl_report_folders where fdr_parent_id =" + _folderID Using (SqlConnection cnn = new SqlConnection(_connectionString)) Private string _connectionString = new ServerInfo().ConnectionString My two classes that exist in the TreeView are:įolder items: public class FavoriteFolder I have looked at many examples, but I am still new to MVVM and WPF in general, so any guidance for my particular example would be much appreciated FavoriteReport - an object that cannot have any children: when a user clicks on this item it will run a report.Ĭurrently I have a Model-View type setup (I think), and I would like to change it to MVVM so I can do things with the TreeView-items rather than simply display them.FavoriteFolder - an object that can have children: either folders or reports.There are 2 objects that live in the tree:
![wpf mvvm treeview example wpf mvvm treeview example](https://i.ytimg.com/vi/R_NQlB5eHKE/maxresdefault.jpg)
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.I have a TreeView that I (finally) have been able to populate from a database using data binding. 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. You can tell it to bind elements and also how it should bind the children, grandchildren and so on. TreeView control allows you to create an hierarchical structure.