Approach 1 – ItemsControl Unless you need other aspects of the ListBox, you could use ItemsControl instead. It places items in the ItemsPanel and doesn’t have the concept of selection. <ItemsControl ItemsSource=”{Binding MyItems}” /> By default, ItemsControl doesn’t support virtualization of its child elements. If you have a lot of items, virtualization can reduce memory … Read more
Methods It’s always better to loop through an array than a range – it’s much faster. It’s even faster to create a variant data field array with a one liner instead of redimensioning a predeclared array and fill it in an extra loop as proposed by Siddharth Rout (though a good method 🙂 Note: The … Read more
You’re looking for the DataSource property: List<SomeType> someList = …; myListBox.DataSource = someList; You should also set the DisplayMember property to the name of a property in the object that you want the listbox to display. If you don’t, it will call ToString().
Thanks for the answer by Grad van Horck. It guided me in the correct direction. To support text (not just background color), here is my fully working code: //global brushes with ordinary/selected colors private SolidBrush reportsForegroundBrushSelected = new SolidBrush(Color.White); private SolidBrush reportsForegroundBrush = new SolidBrush(Color.Black); private SolidBrush reportsBackgroundBrushSelected = new SolidBrush(Color.FromKnownColor(KnownColor.Highlight)); private SolidBrush reportsBackgroundBrush1 = … Read more
The answer you have referenced is exactly what is causing your problem, the ListBox (which is composed of among other things a ScrollViewer) inside your ScrollViewer catches the MouseWheel event and handles it, preventing it from bubbling and thus the ScrollViewer has no idea the event ever occurred. Use the following extremely simple ControlTemplate for … Read more
Oh, I recently killed whole day to make this working! So the solution is: Make your Image control free resources. So set the BitmapImage bitmapImage = image.Source as BitmapImage; bitmapImage.UriSource = null; image.Source = null; as it was mentioned before. Make sure you virtualize _bitmap on every item of the list. You should load it … Read more
Do you want to remove all items? If so, do the foreach first, then just use Items.Clear() to remove all of them afterwards. Otherwise, perhaps loop backwards by indexer: listBox1.BeginUpdate(); try { for(int i = listBox1.Items.Count – 1; i >= 0 ; i–) { // do with listBox1.Items[i] listBox1.Items.RemoveAt(i); } } finally { listBox1.EndUpdate(); }
To answer the overarching question – how to do this in WinForms – I’d suggest the following: Use a WPF ListBox in your WinForms application, wrapped in an ElementHost. This has its own issues, but I think it’s the cleanest way to get the desired effect. if that doesn’t fit the bill, then Use a … Read more