Not set property if validation behavior fails.

[Stefan13-13]

When a ValidationBehavior Invalidates a value, can I prevent the setter from being called (or know this in the setter so I can prevent the invalid value to be assinged to my field)?

I have an entry:

<Entry
    Grid.Row="1"
    Grid.Column="1"
    Keyboard="Numeric"
    Text="{Binding Port}"
    Style="{StaticResource SettingValue}">
    <Entry.Behaviors>
        <mct:NumericValidationBehavior
            InvalidStyle="{StaticResource InvalidEntryStyle}"
            ValidStyle="{StaticResource ValidEntryStyle}"
            Flags="ValidateOnValueChanged"
            MinimumValue="1"
            MaximumValue="65535"
            MaximumDecimalPlaces="0"/>
    </Entry.Behaviors>
</Entry>

My property is just basic

public class MyViewModel : ObservableObject
{
    private int _port;
    public int Port
    {
        get { return  _port; }
        set
        {
            // It would be acceptable if I can get access to the validation result here to skip SetProperty.
            // I'm affraid that approach will fail because that would probably break my input in Entry when
            // the value I type is invalid during typing until I type the last character.
            SetProperty(ref _port, value);
        }
    }
}

It validates if the port number is an integer and in a valid range.

If the value is not valid, the InvalidEntryStyle is used which is good.
However, the invalid value does get stored in the property, meaning that I have to check/validate the property value wherever I use it.

I hope to prevent just that by validating the input. Only when the input is valid, the value should get stored.

[Stefan13-13]

An alternative approach would be to have a method void Save() that accesses the validators of each entry and if all are ok it continues.

ObservableValidator has a method ValidateProperty that does this, but it is protected.
Also I don't know how to get access to my ObservableValidator intance of my Entry in the void Save() method in my viewmodel?

Any guidance would be appreciated.