select all checkbox in datagrid header not working properly in wpf mvvm

Question

This is what i wantI am working on wpf mvvm datagrid and trying to bind the select all checkbox with the view model. It is not giving me proper result. I am giving my code details here(The xaml code and the view model code)

 <DataGrid Grid.Row="0" ItemsSource="{Binding Path=UsecaseListItems}" AutoGenerateColumns="False" Name="MyDataGrid"
          CanUserAddRows="False" >
        <DataGrid.Columns>
            <DataGridCheckBoxColumn Binding="{Binding IsSelected}" Width="50" >
                <DataGridCheckBoxColumn.HeaderTemplate>
                    <DataTemplate x:Name="dtAllChkBx">
                        <CheckBox Name="cbxAll" Content="All" IsChecked="{Binding Path=DataContext.AllSelected,RelativeSource={RelativeSource AncestorType=DataGrid},Mode=TwoWay}"/>
                    </DataTemplate>
                </DataGridCheckBoxColumn.HeaderTemplate>
            </DataGridCheckBoxColumn>
            <DataGridTemplateColumn Header="Name" Width="SizeToCells" IsReadOnly="True">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <TextBlock Text="{Binding UsecaseName}" />
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
        </DataGrid.Columns>
    </DataGrid>


private bool _IsSelected;
    public bool IsSelected
    {
        get { return _IsSelected; }
        set
        {
            _IsSelected = value;
            OnPropertyChanged("IsSelected");
        }
    }

    private bool _AllSelected;
    public bool AllSelected
    {
        get { return _AllSelected; }
        set
        {
            _AllSelected = value;
            foreach (var reportListItemModel in UsecaseListItems)
            {
                reportListItemModel.IsSelected = this._AllSelected;
            }
            OnPropertyChanged("IsSelected");

        }
    }


    private ObservableCollection<UseCase> _usecaseListItems = new ObservableCollection<UseCase>();
    public ObservableCollection<UseCase> UsecaseListItems
    {
        get { return _usecaseListItems; }
        set {
            _usecaseListItems = value;
            OnPropertyChanged("UsecaseListItems");
        }
    }

Your code seems to be wrong. Why do you want to bind it to a viewmodel? Why don't you try to bind the checkbox to the header checkbox isChecked? — ViVi
– ViVi, Commented May 5, 2016 at 8:19

Mark · Accepted Answer · 2020-03-25 12:14:58Z

1

Same problem, I had...

RelativeSource={RelativeSource AncestorType=DataGrid}

It didn't work, so I tried...

RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}

... and it worked.

answered Mar 25, 2020 at 12:14

Mark

936 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

karthik krishnasamy · Accepted Answer · 2016-05-05 06:11:26Z

0

Since allselected property in view model , you have to give ancestortype into window or user control instead of datagrid...

answered May 5, 2016 at 6:11

karthik krishnasamy

465 bronze badges

3 Comments

ankita kumari Over a year ago

The main problem is When I am checking it half of the list (which is present at below part of the scroll bar ) is checked only and then again I scroll it up,the rest of the checkboxes are checked.

ankita kumari Over a year ago

I have used updatesourcetrigger=true but still not working

karthik krishnasamy Over a year ago

check trigger event OnPropertyChanged("IsSelected"); instead of this give OnPropertyChanged("AllSelected");.. Also give ancestor type into window or usercontrol what ever it may be ...

Box Box Box Box · Accepted Answer · 2016-05-06 10:01:50Z

0

Check trigger event OnPropertyChanged("IsSelected");. Instead of using this, give OnPropertyChanged("AllSelected");. Also give ancestor type into window or user-control what ever it may be ...

edited May 6, 2016 at 10:01

Box Box Box Box

5,38810 gold badges52 silver badges71 bronze badges

answered May 5, 2016 at 6:24

karthik krishnasamy

465 bronze badges

Collectives™ on Stack Overflow

select all checkbox in datagrid header not working properly in wpf mvvm

3 Answers 3

Comments

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related