How to Select All CheckBox of a Column by DataGrid Header CheckBox in WPF DataGrid

Question

I have a DataGrid with one CheckBoxColumn. In the header of that CheckBoxColumn I have added a CheckBox to Select all CheckBoxes of that Datagrid Row.

How can I achi

Answer 1

Convert your Candidate class into something like this:

public class Candidate : DependencyObject
{
    //CandidateID Dependency Property
    public int CandidateID
    {
        get { return (int)GetValue(CandidateIDProperty); }
        set { SetValue(CandidateIDProperty, value); }
    }
    public static readonly DependencyProperty CandidateIDProperty =
        DependencyProperty.Register("CandidateID", typeof(int), typeof(Candidate), new UIPropertyMetadata(0));
    //RegisterNo Dependency Property
    public int RegisterNo
    {
        get { return (int)GetValue(RegisterNoProperty); }
        set { SetValue(RegisterNoProperty, value); }
    }
    public static readonly DependencyProperty RegisterNoProperty =
        DependencyProperty.Register("RegisterNo", typeof(int), typeof(Candidate), new UIPropertyMetadata(0));
    //CandidateName Dependency Property
    public string CandidateName
    {
        get { return (string)GetValue(CandidateNameProperty); }
        set { SetValue(CandidateNameProperty, value); }
    }
    public static readonly DependencyProperty CandidateNameProperty =
        DependencyProperty.Register("CandidateName", typeof(string), typeof(Candidate), new UIPropertyMetadata(""));
    //BooleanFlag Dependency Property
    public bool BooleanFlag
    {
        get { return (bool)GetValue(BooleanFlagProperty); }
        set { SetValue(BooleanFlagProperty, value); }
    }
    public static readonly DependencyProperty BooleanFlagProperty =
        DependencyProperty.Register("BooleanFlag", typeof(bool), typeof(Candidate), new UIPropertyMetadata(false));
}

in MainWindow.xaml:

in MainWindow.xaml.cs:

    public MainWindow()
    {
        DataContext = this;
        CandidateList.Add(new Candidate()
        {
            CandidateID = 1,
            CandidateName = "Jack",
            RegisterNo = 123,
            BooleanFlag = true
        });
        CandidateList.Add(new Candidate()
        {
            CandidateID = 2,
            CandidateName = "Jim",
            RegisterNo = 234,
            BooleanFlag = false
        });
        InitializeComponent();
    }
    //List Observable Collection
    private ObservableCollection _candidateList = new ObservableCollection();
    public ObservableCollection CandidateList { get { return _candidateList; } }
    private void CheckBox_Checked(object sender, RoutedEventArgs e)
    {
        foreach (var item in CandidateList)
        {
            item.BooleanFlag = true;
        }
    }
    private void UnheckBox_Checked(object sender, RoutedEventArgs e)
    {
        foreach (var item in CandidateList)
        {
            item.BooleanFlag = false;
        }
    }