WPF DataBinding: Nullable Int still gets a validation error?
C#WpfValidationData BindingC# Problem Overview
I have a textbox databound to a nullable int through code. If I erase the data from the textbox it gives me a validation error (red border around it).
Here is my binding code:
ZipBinding = new Binding("Zip");
ZipBinding.Source = Address;
zipTextBox.SetBinding(TextBox.TextProperty, ZipBinding);
public Int32? Zip { get { ... } set { ... } }
It's clearly marked as a Nullable
C# Solutions
Solution 1 - C#
Validation is failing because it can't convert the empty string to a nullable integer. Set TargetNullValue to string.empty on the Binding and it will convert the empty string to null, which will be valid.
Solution 2 - C#
An empty TextBox != null.
You may have to tweak the ValidationRule to accommodate empty strings as entries. Or, you could create a converter to take empty strings and convert them to null.