DataGrid catch cell value changed event with a single click on UpdateSourceTrigger = SourceUpdated

Question

I\'m struggling to catch an event with a DataGrid. What I want to achieve is that when the user clicks ONCE on a checkbox of a datagrid cell, an event fires and I can get th

Answer 1

Try this simple way

private void myDataGrid_CellEditEnding(object sender, DataGridCellEditEndingEventArgs e)
    {
        if (e.Column.SortMemberPath.Equals("EndDate"))
        {
            if (((MyObjectInRow)e.Row.Item).DataFine.Equals(EndDate.MinValue))
            {
                ((MyObjectInRow)e.Row.Item).Completed = 1;
            }
            else
            {
                ((MyObjectInRow)e.Row.Item).Completed = 0;
            }


        }
    }

Answer 2

1) In your DataGrid register for TargetUpdated event .

2) Specify a Column , and ideally set AutoGenerateColumns=False .

3) In your Binding flag the NotifyOnTargetUpdated property (your target is your checkbox).

4) In your Binding UpdateSourceTrigger=PropertyChanged and Mode=TwoWay (not the default behavior of the DataGrid).

XAML :

 <DataGrid TargetUpdated="DataGrid_TargetUpdated" 
           AutoGenerateColumns="False" 
           ItemsSource="{Binding SomeValues, Mode=OneWay}"  CanUserAddRows="False"  >
    <DataGrid.Columns>
        <DataGridCheckBoxColumn Binding="{Binding Path=.,  NotifyOnTargetUpdated=True, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" Width="*"/>                        
    </DataGrid.Columns>
</DataGrid>

in CS: (where you might wan't to handle that event.)

   private void DataGrid_TargetUpdated(object sender, DataTransferEventArgs e)
   {
         // Do what ever...
   }  

Answer 3

This is how I solved it. It's not the best of the solution but it works for me. As stated by @eranotzap I set set AutoGenerateColumns=False and UpdateSourceTrigger = PropertyChanged. Then I did the following:

<DataGrid Grid.ColumnSpan="2" Grid.Row="1" Grid.Column="0" 
          AutoGenerateColumns="False" 
          ItemsSource="{Binding MasterDataTable, Mode=TwoWay}" 
          CanUserAddRows="False" 
          Margin="10 5">
    <DataGrid.Columns>
        <DataGridTextColumn Binding="{Binding Path=Fornitore}" Header="Fornitore" Width="Auto" IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=Stat}" Header="Stat" Width="Auto" IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=Intestazione}" Header="Intestazione" Width="*" IsReadOnly="True" >
        <DataGridTextColumn.ElementStyle>
            <Style TargetType="TextBlock">
                <Setter Property="TextWrapping" Value="Wrap" />
            </Style>
        </DataGridTextColumn.ElementStyle>
        <DataGridTextColumn.EditingElementStyle>
            <Style TargetType="TextBox">
                <Setter Property="TextWrapping" Value="Wrap" />
                <Setter Property="AcceptsReturn" Value="true" />
            </Style>
        </DataGridTextColumn.EditingElementStyle>
        </DataGridTextColumn>
        <DataGridTextColumn Binding="{Binding Path=PrzVend}" Header="PrzVend" Width="Auto" IsReadOnly="True" />
        <DataGridTextColumn Binding="{Binding Path=DatEXPO}" Header="DatEXPO" Width="Auto" IsReadOnly="True" />
        <DataGridCheckBoxColumn Binding="{Binding Path=Sel, NotifyOnSourceUpdated=False, NotifyOnTargetUpdated=True, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" Header="Sel" Width="Auto">
            <DataGridCheckBoxColumn.CellStyle>
                <Style TargetType="DataGridCell">
                    <EventSetter Event="CheckBox.Checked" Handler="CellChanged"/>
                    <EventSetter Event="CheckBox.Unchecked" Handler="CellChanged"/>
                    <Style.Triggers>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsMouseOver" Value="True" />
                                <Condition Property="IsReadOnly" Value="False" />
                            </MultiTrigger.Conditions>
                            <Setter Property="IsEditing" Value="True" />
                        </MultiTrigger>
                    </Style.Triggers>
                </Style> 
            </DataGridCheckBoxColumn.CellStyle>
        </DataGridCheckBoxColumn>
        <DataGridTextColumn Binding="{Binding Path=CodComp}" Header="CodComp" Width="Auto" IsReadOnly="True" />
    </DataGrid.Columns>
</DataGrid>

In the code behind the method CellChanges is called every time the checkbox is checked or unchecked. To get the value I do the following:

void CellChanged(object sender, RoutedEventArgs e)
{
    if (sender as DataGridCell != null && (sender as DataGridCell).Column != null && (sender as DataGridCell).Column.Header != null)
    {

        bool? isSelected = (e.OriginalSource as ToggleButton).IsChecked;

    }
}

Hope it helps somebody.