Using the following XAML how can I get a reference to the selected radiobutton in the eventhandler of the Button?
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525" x:Name="myWindow">
<Grid>
<StackPanel>
<RadioButton Content="A" GroupName="myGroup"></RadioButton>
<RadioButton Content="B" GroupName="myGroup"></RadioButton>
<RadioButton Content="C" GroupName="myGroup"></RadioButton>
</StackPanel>
<Button Click="Button_Click" Height="100" Width="100"></Button>
</Grid>
</Window>
The simplest way would be to give each RadioButton a name, and test its IsChecked property.
<RadioButton x:Name="RadioButtonA" Content="A" GroupName="myGroup"></RadioButton>
<RadioButton x:Name="RadioButtonB" Content="B" GroupName="myGroup"></RadioButton>
<RadioButton x:Name="RadioButtonC" Content="C" GroupName="myGroup"></RadioButton>
if (RadioButtonA.IsChecked) {
...
} else if (RadioButtonB.IsChecked) {
...
} else if (RadioButtonC.IsChecked) {
...
}
But using Linq and the Logical Tree you can make it a bit less verbose:
myWindow.FindDescendants<CheckBox>(e => e.IsChecked).FirstOrDefault();
Where FindDescendants is a reusable extension method:
public static IEnumerable<T> FindDescendants<T>(this DependencyObject parent, Func<T, bool> predicate, bool deepSearch = false) where T : DependencyObject {
var children = LogicalTreeHelper.GetChildren(parent).OfType<DependencyObject>().ToList();
foreach (var child in children) {
var typedChild = child as T;
if ((typedChild != null) && (predicate == null || predicate.Invoke(typedChild))) {
yield return typedChild;
if (deepSearch) foreach (var foundDescendant in FindDescendants(child, predicate, true)) yield return foundDescendant;
} else {
foreach (var foundDescendant in FindDescendants(child, predicate, deepSearch)) yield return foundDescendant;
}
}
yield break;
}
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