Question

When I try to input a DOT or a COMMA in a textbox, for example 1.02 or 83,33 the textbox prevents me to input such a value (and the input turns red). The textbox is bound to a float property. Why?

I have bound a textbox to a float Property Power of a class implementing INotifyPropertyChanged.

private float _power;

public float Power
{
    get { return _power; }
    set
    {
        _power = value;
        OnPropertyChanged("Power");
    }
}

In Xaml

<TextBox Name="txtPower" Height="23" TextWrapping="Wrap" Text="{Binding Path=Power, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"></TextBox>

I have no custom validation at all right now.

Also tried decimal but it does not work either. For string everything works fine.

Answer 1

Try adding a StringFormat definition to the binding.
Like so:

<TextBox Name="txtPower" Height="23" 
    TextWrapping="Wrap" Text="{Binding Path=Power, Mode=TwoWay, 
    UpdateSourceTrigger=PropertyChanged,StringFormat=N2}"></TextBox>