WPF checkbox all not not updating on one checkbox row is unchecked

Question

I had a checkbox all column inside the datagrid in WPF C#.

                     <DataGridCheckBoxColumn Binding="{Binding IsSelected,UpdateSourceTrigger=PropertyChanged}" CanUserSort="False">
                    <DataGridCheckBoxColumn.ElementStyle>
                        <Style TargetType="CheckBox" BasedOn="{StaticResource {x:Type CheckBox}}">
                            <Setter Property="VerticalAlignment" Value="Center"/>
                            <Setter Property="HorizontalAlignment" Value="Center"/>
                        </Style>
                    </DataGridCheckBoxColumn.ElementStyle>
                    <DataGridCheckBoxColumn.HeaderTemplate>
                        <DataTemplate x:Name="dtAllChkBx">
                            <CheckBox Name="cbxAll" HorizontalAlignment="Center" Margin="0,0,5,0" IsEnabled="{Binding Path=DataContext.IsCbxAllEnabled,RelativeSource={RelativeSource AncestorType=DataGrid}}"
                                      IsChecked="{Binding Path=DataContext.AllSelected,RelativeSource={RelativeSource AncestorType=DataGrid},UpdateSourceTrigger=PropertyChanged}"/>
                        </DataTemplate>
                    </DataGridCheckBoxColumn.HeaderTemplate>
                </DataGridCheckBoxColumn>

When I check the All checkbox, of course, it will mark all the checkboxes, but once I uncheck one checkbox, the All checkbox is still checked. This should be unchecked. How should I do that using WPF C#.

@GlenThomas private bool _AllSelected; public bool AllSelected { get { return _AllSelected; } set { _AllSelected = value; TaskList.ToList().ForEach(x => x.IsSelected = value); NotifyOfPropertyChange(() => AllSelected); } } — Pa1
– Pa1, Commented Aug 11, 2015 at 10:04
AllSelected property is here for selected all and unselecting all. — Pa1
– Pa1, Commented Aug 11, 2015 at 10:07
Does the IsSelected value of the TaskList items have NotifyOfPropertyChange? — Glen Thomas
– Glen Thomas, Commented Aug 11, 2015 at 10:55
writtern the full code for checkbox logic .Don't know where i am doing wrong — Pa1
– Pa1, Commented Aug 12, 2015 at 5:03

Vladimir Mezentsev · Accepted Answer · 2015-08-12 06:33:53Z

1

If I understood you correctly - after any change of IsSelected property inside collection item you should update AllSelected value.

So, you need some callback inside all your items(event or Action or any mechanism you want) and change get logic for AllSelected

Here is some draft for item IsSelected property and constructor:

public bool IsSelected {
    get { return isSelected; }
    set {
        isSelected = value;
        OnPropertyChanged();
        if (globalUpdate != null) globalUpdate();
    }
}

public ItemClass(Action globalUpdate, ...your parameters) {
    this.globalUpdate = globalUpdate;
    ...do smth with your parameters
}

Example of usage:

new ItemClass(() => OnPropertyChanged("AllSelected"))

And of course don't forget about AllSelected getter

public bool AllSelected {
        get { return YourGridItemsCollection.All(item => item.IsSelected); }

Now when you check manually all items then AllSelected will be automatically checked, and unchecked when you uncheck any item.

answered Aug 12, 2015 at 6:33

Vladimir Mezentsev

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3 Comments

Vladimir Mezentsev Over a year ago

And what is your problem then?

Pa1 Over a year ago

The problem is when i check AllSelected checkbox then all the checkbox in that got column got selected but if i uncheck any of the checkbox of any row in that column, The AllSelected checkbox doesnot get unchecked

Vladimir Mezentsev Over a year ago

The provided solution is exactly for that. You should notify AllSelected checkbox about changes inside your rows and slightly modify its getter. Please just read my answer more carefully.

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