How do I invert BooleanToVisibilityConverter?

Instead of inverting, you can achieve the same goal by using a generic IValueConverter implementation that can convert a Boolean value to configurable target values for true and false. Below is one such implementation:

public class BooleanConverter<T> : IValueConverter{    public BooleanConverter(T trueValue, T falseValue)    {        True = trueValue;        False = falseValue;    }    public T True { get; set; }    public T False { get; set; }    public virtual object Convert(object value, Type targetType, object parameter, CultureInfo culture)    {        return value is bool && ((bool) value) ? True : False;    }    public virtual object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)    {        return value is T && EqualityComparer<T>.Default.Equals((T) value, True);    }}

Next, subclass it where T is Visibility:

public sealed class BooleanToVisibilityConverter : BooleanConverter<Visibility>{    public BooleanToVisibilityConverter() :         base(Visibility.Visible, Visibility.Collapsed) {}}

Finally, this is how you could use BooleanToVisibilityConverter above in XAML and configure it to, for example, use Collapsed for true and Visible for false:

<Application.Resources>    <app:BooleanToVisibilityConverter         x:Key="BooleanToVisibilityConverter"         True="Collapsed"         False="Visible" /></Application.Resources>

This inversion is useful when you want to bind to a Boolean property named IsHidden as opposed IsVisible.

using System;using System.Globalization;using System.Windows;using System.Windows.Data;public sealed class BooleanToVisibilityConverter : IValueConverter{    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)    {        var flag = false;        if (value is bool)        {            flag = (bool)value;        }        else if (value is bool?)        {            var nullable = (bool?)value;            flag = nullable.GetValueOrDefault();        }        if (parameter != null)        {            if (bool.Parse((string)parameter))            {                flag = !flag;            }        }        if (flag)        {            return Visibility.Visible;        }        else        {            return Visibility.Collapsed;        }    }    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)    {        var back = ((value is Visibility) && (((Visibility)value) == Visibility.Visible));        if (parameter != null)        {            if ((bool)parameter)            {                back = !back;            }        }        return back;    }}

and then pass a true or false as the ConverterParameter

       <Grid.Visibility>                <Binding Path="IsYesNoButtonSetVisible" Converter="{StaticResource booleanToVisibilityConverter}" ConverterParameter="true"/>        </Grid.Visibility>

Write your own is the best solution for now. Here is an example of a Converter that can do both way Normal and Inverted. If you have any problems with this just ask.

[ValueConversion(typeof(bool), typeof(Visibility))]public class InvertableBooleanToVisibilityConverter : IValueConverter{    enum Parameters    {        Normal, Inverted    }    public object Convert(object value, Type targetType,                          object parameter, CultureInfo culture)    {        var boolValue = (bool)value;        var direction = (Parameters)Enum.Parse(typeof(Parameters), (string)parameter);        if(direction == Parameters.Inverted)            return !boolValue? Visibility.Visible : Visibility.Collapsed;        return boolValue? Visibility.Visible : Visibility.Collapsed;    }    public object ConvertBack(object value, Type targetType,        object parameter, CultureInfo culture)    {        return null;    }}

<UserControl.Resources>  <Converters:InvertableBooleanToVisibilityConverter x:Key="_Converter"/></UserControl.Resources><Button Visibility="{Binding IsRunning, Converter={StaticResource _Converter}, ConverterParameter=Inverted}">Start</Button>