WPF RadioButton Example (Checked)Use the WPF RadioButton control. Handle the RadioButton_Checked event.
RadioButton. A RadioButton offers an option. It is always visible, and is part of a group of other RadioButtons. One option can be "checked" at a time by the user. We use a RadioButton in WPF, handling its Checked event.
First, please create a WPF application and drag two RadioButton controls to the window. Next, add the "Checked" attribute to each "RadioButton" element in the XAML. Have Visual Studio create RadioButton_Checked.
Checked The Checked event is triggered when the user clicks or selects a RadioButton. The "check" is a black circle.
Note We can have both RadioButton elements point to a single RadioButton_Checked method. Two different methods could instead be used.
In RadioButton_Checked, we access the RadioButton object that raised the event. We cast the "sender" object to a RadioButton type with the as-cast. We then call ToString on its Content property and change the Window Title.
Example markup: XAML
<Window x:Class="WpfApplication16.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"> <Grid> <RadioButton Content="Dogs" Checked="RadioButton_Checked" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top"/> <RadioButton Content="Cats" Checked="RadioButton_Checked" HorizontalAlignment="Left" Margin="10,30,0,0" VerticalAlignment="Top"/> </Grid> </Window>
using System.Windows; using System.Windows.Controls; namespace WpfApplication16 { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } private void RadioButton_Checked(object sender, RoutedEventArgs e) { // ... Get RadioButton reference. var button = sender as RadioButton; // ... Display button content as title. this.Title = button.Content.ToString(); } } }
Discussion. How can you keep track of which RadioButton is currently checked? One way involves uses a field. Store a field (int, string) on the MainWindow class. And in Checked, assign it to the result of the Content.ToString() method.
Then You can access this field anywhere (in any method) in your WPF program to determine which RadioButton is checked.
Summary. A CheckBox control may be checked at the same time as another. But only one RadioButton control can be checked. For this reason, a RadioButton can be used to select an exclusive option, such as a program mode.
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