Question

I need to add ValidationRule to the TextBox programmatically in WPF.
I’m trying something like:

Binding binding = BindingOperations.GetBinding(myTextBox, TextBox.TextProperty);
binding.ValidationRules.Clear();
binding.ValidationRules.Add(myValidationRule);

But BindingOperations.GetBinding return null. Why?
Many thanks.

Answer 1

From the API:

Return Value

Type: System.Windows.Data.Binding The Binding object set on the given
property or Nothing if no Binding object has been set.

So apparantly there is no Bindig object set.

Source