How to bind WPF radio button selection to Viewmodel using convertes? - wpf

Question

I have a WPF-MVVM application...
I have 3 Radio button controls - with three options => "Individual", "Group" and "Both".
All 3 have same Group name...that means only one of these radio button can be selected.
I can have three properties in viewmodel...for each of these three options...and can check which one is selected.
Function()
{
if (Is_Individual_property)
{
// Individual selected
}
if (Is_Group_property)
{
// group selected
}
if (Is_Both_property)
{
// Both selected
}
}
But I think this is not best approach.
Can I have just one property in viewmodel and bind the values accordingly ?

Answer 1

How about having a single property and managing multiple values using a converter. For example:
XAML:
<Grid>
<Grid.Resources>
<local:BooleanToStringValueConverter x:Key="BooleanToStringValueConverter" />
</Grid.Resources>
<StackPanel>
<TextBlock Text="{Binding Property1}" />
<RadioButton Name="RadioButton1"
GroupName="Group1"
Content="Value1"
IsChecked="{Binding Path=Property1, Converter={StaticResource BooleanToStringValueConverter}, ConverterParameter=Value1}" />
<RadioButton Name="RadioButton2"
GroupName="Group1"
Content="Value2"
IsChecked="{Binding Path=Property1, Converter={StaticResource BooleanToStringValueConverter}, ConverterParameter=Value2}" />
<RadioButton Name="RadioButton3"
GroupName="Group1"
Content="Value3"
IsChecked="{Binding Path=Property1, Converter={StaticResource BooleanToStringValueConverter}, ConverterParameter=Value3}" />
</StackPanel>
</Grid>
Converter:
public class BooleanToStringValueConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (System.Convert.ToString(value).Equals(System.Convert.ToString(parameter)))
{
return true;
}
return false;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (System.Convert.ToBoolean(value))
{
return parameter;
}
return null;
}
}
Class:
public class MyClass : INotifyPropertyChanged
{
private String _property1;
public String Property1
{
get { return _property1; }
set { _property1 = value; RaisePropertyChanged("Property1"); }
}
public event PropertyChangedEventHandler PropertyChanged;
protected void RaisePropertyChanged(String propertyName)
{
PropertyChangedEventHandler temp = PropertyChanged;
if (temp != null)
{
temp(this, new PropertyChangedEventArgs(propertyName));
}
}
}
Window:
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DataContext = new MyClass() { Property1 = "Value1" };
}
}