MVVM - Binding Multiple Radio Buttons To a single Enum Property in WPF


ANOOP MADHUSUDANAN

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I had a property in my View Model, of an Enum type, and wanted to bind multiple radio buttons to this.

Firstly, I wrote a simple Enum to Bool converter, like this.

public class EnumToBoolConverter : IValueConverter
    {
        #region IValueConverter Members

        public object Convert(object value, 
            Type targetType, object parameter, 
            System.Globalization.CultureInfo culture) 
        { 
            if (parameter.Equals(value)) 
                return true; 
            else 
                return false; 
        } 

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
        { 
            return parameter; 

        } 
        #endregion 

    }


And my enumeration is like

public enum CompanyTypes
    {
        Type1Comp,
        Type2Comp,
        Type3Comp
    }
Now, in my XAML, I provided the enumeration as the ConverterParameter, of the Converter we wrote earlier, like
<Window x:Class="WpfTestRadioButtons.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WpfTestRadioButtons"
    Title="Window1" Height="300" Width="300">
    <Window.Resources>
        <local:EnumToBoolConverter x:Key="EBConverter"/>
    </Window.Resources>
    <Grid>
        <StackPanel>
            <RadioButton IsChecked="{Binding Path=Type, 
                Converter={StaticResource EBConverter}, 
                ConverterParameter={x:Static local:CompanyTypes.Type1Comp}}" Content="Type1"/>
            <RadioButton IsChecked="{Binding Path=Type, 
                Converter={StaticResource EBConverter}, 
                ConverterParameter={x:Static local:CompanyTypes.Type2Comp}}" Content="Type2"/>
        </StackPanel>

    </Grid>
</Window>


Now, in the view model, I exposed a property named Type, which is of the CompanyEnum type. Like,
public CompanyTypes Type 
        {
            get
            {
                return _type;
            }
            set
            {
                _type = value;
                if (PropertyChanged != null)
                    PropertyChanged(this, new PropertyChangedEventArgs("Type"));

            }
        }
And it seems that I'm pretty much done. Alternatively, you can use the same idea to pass an integer, but in that case, you need to change the converter a bit. See the NumToBool converter I mentioned earlier :)

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