9/3/2023 0 Comments Treeview in vb net![]() ![]() Add the next code for the ‘ Load Planets‘ button: If blnClear Then () 'Clear If Desiredĭim strPlanet As String 'Variable To Use To Loop Through Planet Array These values will now be loaded into the Treeview. This code populates our Planets and Dwarf Planet arrays with values. This is the first event that runs (although not technically, but for this article it is): 'Load All Planets Into Array The Clear variable simply helps you determine if the Clear checkbox has been clicked or not.Īdd the next code the Form Load event. With the Moons array, I did not include an amount of items as it will continuously be resized according to which planet or dwarf planet was selected. Here, I actually created three Arrays and one Boolean variable. Private blnClear As Boolean 'Clear Treview? Private arrDwarfPlanets(4) ' Dwarf Planets Add the following in the General Declarations section of your form: Private arrPlanets(7) 'Planets CodeĪs usual, let me start with the variables that need to be declared. Now where is the button for the moons I spoke about, you ask? Well, as said, we will use different logic to add them. Then there is a checkbox that allows you to clear the Treeview. I did not name any of the controls on the forms as I want to keep this article as simple as possible.Īs you can see, there are two buttons to load the planets or dwarf planets. Start a new VB.NET Windows Forms Project, and design your form to resemble the next Figure. If you do not know astronomy, hopefully today you’ll learn more about that too! The sample you will create today will load all the planets and dwarf planets into the Treeview, and then load each planet or dwarf planet’s moon afterwards. This sample will demonstrate the basic usage of the Treeview control. It is always best to learn practically – that is how I have learned. In case you don’t follow me, here is a picture of a treeview in action :įigure 1 – Treeview in action Treeview Methods and PropertiesĪs with any other control, MSDN contains all the methods, properties and even samples for it. By clicking on the + you expand the folder structure. If you see a plus sign next to the Drive or folder, you know that there are other folders inside it. Next to a Drive or a folder there might be a + sign. On the left side you will see all the drives and folders. You must have seen a treeview before! Look at your Windows Explorer. Instead of being called branches, they are called Nodes. It has branches that have branches, that have branches. You know what a tree looks like? The Treeview functions similar. Today I will demonstrate how to use the Treeview and how easy it actually is to use. I had a similar experience with the ListView, but I’ll talk about that next time. For some reason I couldn’t wrap my head around it. The Treeview control gave me nightmares when I started programming many aeons ago.
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