Private Sub Button1_Click(ByVal sender As System.Object, _īyVal e As System.EventArgs) Handles Button1.Clickĭim cn As New OleDbConnection(connectionString:=Connection)Ĭn.GetOleDbSchemaTable(schema:=, _ Private Sub Form1_Load(ByVal sender As System.Object, _īyVal e As System.EventArgs) Handles MyBase.Load 'The name of the database in use which is used as the root name forĬonst Database As String = "NorthWind 2007" "Provider=.12.0 Data Source=C:\Northwind 2007.accdb" As the below code shows we create a node and we add the wanted data to the created node in one go. Now it’s time to add some code enabling us to populate the TreeView control with the wanted data. We add two buttons to the Windows Form and manipulate them so they look like the following screen shot: For best performance change the ColorDepth for the list of images as the following screen shot shows: In other words, we will have three node levels root, tables and columns. Next, add three images to the ImageList which will differentiate the node levels from each other. Add a TreeView control to the Windows Form and also add an ImageList to the project. how to get tables and columns from a various type of databases.įirst of all we create a new Windows Form project in VB. In the final entry about the TreeView control a more generic approach will be discussed, i.e. In the next blog entry I will show how we can populate a TreeView control with data from a SQL Server database. To grab the names for all the tables as well as columns from a MS Access database can also be tricky but again I hope that the following case will clear the mud so to speak.Īt present I work with a new coming add-in that will include an advanced report generator and to work with tables and columns in a database plays a critical role in that tool. To work with TreeView controls can initially be tricky to understand but I hope the case here will make it more understandable. One common task is to let an application scan disks for folders and files and then populate a TreeView control with the data in a hierarchical way. In the following example all the tables and their columns from a MS Access database will be added to a Treeview control. xaml files in the project solution:Įach level node has a ViewModel for data binding.Populating TreeViews controls with some data is a common task in various type of applications. Each level node has its own HierarchicalDataTemplate. It is a 4-level TreeView with root node at level 0. Obviously, this article aims at intermediate and advanced WPF users. I do not discuss MVVM here since tons of information can be found on the web. I use TreeView + HierarchicalDataTemplate with multi-level binding because it is one of the least understood XAML binding topics. Simplifying the WPF TreeView by Using the ViewModel Pattern.There are WPF TreeView samples on the web, but they are mostly XAML-based. Charles Petzold wrote a great WPF book using lots of code-behind. Even if you may never need to use it, understanding it will help you better appreciate how WPF works. The code-behind approach is a kind of advanced concept. It can be flexible and powerful when it comes to dynamic UI creation and removal of difficult XAML binding. However, the purpose of this article is to show there is a code-behind way of creating UI in WPF without XAML. To create UI with WPF, you should generally go with XAML almost all the time.
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