How to specify bound property of known name for Avalonia control created in code-behind?

Question

In my Avalonia app, I need to create controls dynamically from a user control's code-behind so I can add them to a StackPanel inside that user control. I know the names of the viewmodel properties to which the dynamic controls' properties should be bound. A viewmodel object will be assigned as the dynamic controls' data context. What is the syntax I need to create the binding for a dynamic control for a given property by name?

For example, I create a checkbox whose IsChecked property is to be bound to my viewmodel's IsActivated property. In pure XAML, it would resemble:

<CheckBox IsChecked="{Binding IsActivated}" Content="Activated"/>

I'm looking for code-behind that looks something like:

var instanceVM = new TheViewModel { IsActviated = true };
var chkBox = new CheckBox { Content = "Activated" };
chkBox.Bind(TextBlock.TextProperty, "IsActivated");
myStackPanel.Children.Add(chkBox);
myStackPanel.DataContext = instanceVM;

How can I do this? Thanks...

docs.avaloniaui.net/docs/guides/data-binding/binding-from-code — Sir Rufo
– Sir Rufo, Commented Oct 27 at 5:13
You may perhaps use an ItemsControl with a collection of different item view models in its ItemsSource. Then declare appropriate DataTemplates for each view model type, as shown here: docs.avaloniaui.net/docs/concepts/templates/…. — Clemens
– Clemens, Commented Oct 27 at 7:41
@SirRufo I had come across that doc before, but I guess I didn't read it thoroughly enough! The stuff in the "Using XAML bindings from code" section seemed to do the trick, thanks so much for the lead. — Eric Eggers
– Eric Eggers, Commented Oct 27 at 20:35

Eric Eggers · Accepted Answer · 2025-10-27 20:46:48Z

0

Per the Avalonia document to which Sir Rufo linked in their comment, there's a way to assign the binding with the known property name at the time of the dynamic control's instantiation:

var chkBox = new CheckBox { Content = "Activated",
  [!CheckBox.IsCheckedProperty] = new Binding("IsActivated", BindingMode.TwoWay)
};

Specifying the Mode was actually not necessary for the CheckBox, but was for the "Value" dependency property of a custom control I created based on the NumericUpDown; without it, sets of the bound VM property would display in the UI, but user changes wouldn't change the VM property.

answered Oct 27 at 20:46

Eric Eggers

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