#351 – Binding a CheckBox’s IsChecked Property to a Boolean Variable

Instead of handling the Checked and Unchecked events of a CheckBox and then setting a boolean variable to represent the current state, you’ll most often just use data binding to bind the IsChecked property to a boolean variable.

In the example below, we have three CheckBox controls, each bound to a boolean property.

        <Label Content="Things my dog can do:"/>
        <CheckBox Content="Sit" IsChecked="{Binding CanSit}"/>
        <CheckBox Content="Stay" IsChecked="{Binding CanStay}"/>
        <CheckBox Content="Fetch" IsChecked="{Binding CanFetch}"/>
        <Button Content="Test" Click="Test_Click"/>

In the code-behind, we define the boolean properties that we can bind to and then set the data context to refer to the parent class.

        public bool CanSit { get; set; }
        public bool CanStay { get; set; }
        public bool CanFetch { get; set; }

		public MainWindow()
            this.DataContext = this;

        private void Test_Click(object sender, RoutedEventArgs e)
            MessageBox.Show(string.Format("Sit: {0}, Stay: {1}, Fetch: {2}", CanSit, CanStay, CanFetch));


About Sean
Software developer in the Twin Cities area, passionate about software development and sailing.

5 Responses to #351 – Binding a CheckBox’s IsChecked Property to a Boolean Variable

  1. Oto says:

    Thanks a lot man, you saved my diploma right now đŸ™‚

  2. Thank yuo for this simple tutorial.
    What is the simplest way to make this twoway binding? I can’t seem to be able to wrap my head around twoway binding.

    • Sean says:

      This example shows one-way binding, from the View to the code. Remember that if you want a change in the code to be reflected in the View, your class will need to implement INotifyPropertyChanged and fire a PropertyChanged event whenever the property value changes. You can’t do this with auto implemented properties, so you’ll need to add a backing variable and implemented the property getters/setters yourself.

    • Sean says:

      Example coming this Wednesday that will demonstrate two-way binding to a CheckBox.

  3. Pingback: #825 – Two Way Binding for a CheckBox | 2,000 Things You Should Know About WPF

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