![]() ![]() Public void get_children(TreeViewItem parent)ĭataRow rows = dt. SqlDataAdapter adapt = new SqlDataAdapter(sql, cnn) ĭataRow rows = dt.Select("fdr_parent_id = '0'") SqlCommand cmd = new SqlCommand(sql, cnn) String sql = "SELECT * FROM tbl_report_folders ORDER BY fdr_parent_id ASC" Using (SqlConnection cnn = new SqlConnection(cnn_string)) TreeViewItem item = (TreeViewItem)e.OriginalSource Public void tv_favorites_Expanded(object sender, RoutedEventArgs e) Private string cnn_string = new cls_server().ConnectionString OK, well I have come up with a solution that seems to work, but I'm not sure if there is a better way.Īny suggestions would be welcome! public partial class MainWindow : Window Can someone please provide me with some insight on how to accomplish this? I have done a lot of reading about hierarchal data templates and observable collections but cannot seem to make them fit with my requirements (probably due to my lack of experience). If I stored the data this way, I would need to add each folder to it's parent folder first (based on the ParentID), then add the reports to the correct folder (based on the FolderID).īeing fairly new to WPF and C# in general, I am not sure if this is the best way or if it would even work. I was thinking of having my database table structure as follows: The application will not know how many levels there will be, only that there are 2 types of items, folders, and reports. The treeview needs to have multiple levels like the following: Step 5: Create XAML Page to Display treeview CompanyDetailView.I am trying to populate a treeview from a database, but I am not sure the best way to do it. I created two methods for getting a list of Departments and List of Employees and bind to each viewmodel properties. This viewmodel is for CompanyDetailView.xaml page declared ObservableCollection DepartmentCollection property to hold collection of departments to bind in treeviewitems. Public class EmployeeViewModel : ViewModelBase Step 3: Create viewmodels for Each Model EmployeeViewModel.cs If we want to notify viewmodels property change, then we must inherit this class in every viewmodel, and override RaisePropert圜hanged method to notify property change. Temp( this, new Propert圜hangedEventArgs(propertyName)) Propert圜hangedEventHandler temp = Propert圜hanged / /// protected void RaisePropert圜hanged( String propertyName) / /// Raise when property value propertychanged ![]() RaisePropert圜hanged(GetPropertyName(propertyExpression)) / /// /// protected virtual void RaisePropert圜hanged / /// Raise when property value propertychanged or override propertychage / /// /// /// public static string GetPropertyName(Expression> e) Public event Propert圜hangedEventHandler Propert圜hanged Public abstract class ViewModelBase:INotifyPropert圜hanged Step 1: Create Models for Department and Employee We wish to bind departments in parent node and employees for each department in child nodes in Treeview. This example is for a Company that has many departments and each department has employees. You can change the style of treeview using custom template style. WPF has HierarchicalDataTemplate to bind treeviewitem in hierarchical data by setting ItemsSource property. One parent node has multiple child nodes. Treeview is used to display data in a hierarchical series with parent child relationship. All business logic related to view is written in viewmodel. I am making a WPF application following MVVM pattern. It has properties, commands and propertychanged notification logic to execute when any property raise or changed. Viewmodel is the mediator between view and viewmodel. View is used for Data binding and displaying data. It contains visual controls and rich UI using styles and templates and storyboard. Model/View/ViewModel also relies on one more thing: a general mechanism for data binding. The Model-View-ViewModel (MVVM) pattern provides a flexible way to build WPF/Silverlight applications that promotes code re-use, simplifies maintenance and supports testing. The Model View ViewModel (MVVM) is an architectural pattern used in software engineering that originated from Microsoft which is specialized in the Presentation Model design pattern. We will also focus on MVVM (Model-View-ViewModel) pattern in this article. In this article, we walk through how to change appearance of Treeview control using Templates and Styles. In the development world, sometimes we have a requirement to change the appearance of the control. ![]()
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