How to check all checkbox C#

Question

i have a few checkboxes an I want funcionality to check or uncheck all checkbox. Here is a class .cs and xaml code. How to add funcionality for check or uncheck all?

    public static event PropertyChangedEventHandler IsCheckedChanged;
    private bool isChecked;

    public WorkStep(string name)
    {
        Name = name;
        IsChecked = true;
    }

    public WorkStep(string name, bool isChecked)
    {
        Name = name;
        IsChecked = isChecked;
    }

    public string Name
    {
        get;
    }

    public bool IsChecked
    {
        get { return isChecked; }
        set
        {
            isChecked = value;
            OnIsCheckedChanged();
        }
    }

    private void OnIsCheckedChanged()
    {
        PropertyChangedEventHandler handler = IsCheckedChanged;
        if (handler != null)
            handler(this, new PropertyChangedEventArgs("IsChecked"));
    }

and xaml:

                                <DataGridTemplateColumn.CellTemplate>
                                    <DataTemplate>
                                        <CheckBox IsChecked="{Binding IsChecked, UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Center"/>
                                    </DataTemplate>
                                </DataGridTemplateColumn.CellTemplate>

I usually make a list : List<Checkbox> myBoxes and add the boxes to the list. Then I can simply write code to enumerate through the list. — jdweng
– jdweng, Commented Jan 15, 2018 at 9:52

Slaven Tojić · Accepted Answer · 2018-01-15 11:09:08Z

I would use the INotifyPropertyChanged interface like shown in the class below:

public class myClass : INotifyPropertyChanged
{
    private bool _IsChecked;
    public bool IsChecked
    {
        get { return _IsChecked; }
        set
        {
            _IsChecked = value;
            OnPropertyChanged("IsChecked");
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;
    protected void OnPropertyChanged(string name)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
    }
}

Then I would bind the property IsChecked to all of my checkboxes like shown below in the xaml:

<Grid>
    <CheckBox x:Name="checkBox1" IsChecked="{Binding IsChecked,UpdateSourceTrigger=PropertyChanged}" Content="CheckBox" HorizontalAlignment="Left" Margin="116,90,0,0" VerticalAlignment="Top"/>
    <CheckBox x:Name="checkBox2" IsChecked="{Binding IsChecked,UpdateSourceTrigger=PropertyChanged}" Content="CheckBox" HorizontalAlignment="Left" Margin="116,126,0,0" VerticalAlignment="Top"/>
    <CheckBox x:Name="checkBox3" IsChecked="{Binding IsChecked,UpdateSourceTrigger=PropertyChanged}" Content="CheckBox" HorizontalAlignment="Left" Margin="116,164,0,0" VerticalAlignment="Top"/>
    <Button x:Name="button" Content="Button" HorizontalAlignment="Left" Margin="380,235,0,0" VerticalAlignment="Top" Width="75" Click="button_Click"/>
</Grid>

In the MainWindow class make a new instance of the class where the IsChecked property is located (in my case myClass MyClass = new myClass()). Then add the newly created instance MyClass to the DataContext of your MainWindow (DataContext = MyClass;). I use a button control in this example to check and uncheck all of my checkboxes. If the value of the property IsChecked is true all of the checkboxes are checked and if it's false all of the checkboxes are unchecked. The MainWindow class is shown below :

public MainWindow()
{
    InitializeComponent();
    DataContext = MyClass;
}

myClass MyClass = new myClass();

private void button_Click(object sender, RoutedEventArgs e)
{
    if(MyClass.IsChecked)
        MyClass.IsChecked = false;
    else
        MyClass.IsChecked = true;
}

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