binding a usercontrol to the opposite of a bool property

Question

Pretty straightforward: I\'m looking to do the same as this but in winforms. Everything that google seems to pull up is wpf specific (ie. I don\'t want to reference presentation

Answer 1

Based on Adam's answer I wrote a small helper class:

class NegateBinding
{
    string propertyName;
    object dataSource;
    string dataMember;
    public NegateBinding(string propertyName, object dataSource, string dataMember)
    {
        this.propertyName = propertyName;
        this.dataSource = dataSource;
        this.dataMember = dataMember;
    }

    public static implicit operator Binding(NegateBinding eb)
    {
        var binding = new Binding(eb.propertyName, eb.dataSource, eb.dataMember, false, DataSourceUpdateMode.OnPropertyChanged);
        binding.Parse += new ConvertEventHandler(negate);
        binding.Format += new ConvertEventHandler(negate);
        return binding;
    }

    static void negate(object sender, ConvertEventArgs e)
    {
        e.Value = !((bool)e.Value);
    }
}

Now you can use it like this:

label1.DataBindings.Add(new NegateBinding("Visible", otherObject, "HasData"));