Toggle Checkbox value after validation

Question

I am trying to toggle the checkboxes in a DataGridCheckboxColumn if it has more than a certain number in another column.

So far, it loops through the DataGrid and succesfully validates the other column I need it to, but I cannot toggle any of the Chekboxes that meet the criteria.

<DataGridTextColumn Header="Total" IsReadOnly="True" Binding="{Binding cost}" Width="130"></DataGridTextColumn>

<DataGridCheckBoxColumn Header="Check" IsReadOnly="False" Width="50">
    <DataGridCheckBoxColumn.ElementStyle>
        <Style />
    </DataGridCheckBoxColumn.ElementStyle>
</DataGridCheckBoxColumn>

for(int i=0; i<dataGrid.Items.Count - 1; i++)
{
    if(Convert.ToDecimal(dataGrid.Columns[3].GetCellContent(i)) > 200)
        {            //Columns[3] is the "Total" Column.
             ((dataGrid.Columns[6]).GetCellContent(i) as CheckBox).IsChecked = true;
             //Columns[6] is the DataGridCheckBoxColumn
        }
}

I get the correct value for the Total column using:

dataGrid.Columns[3].GetCellContent(i)

But

((dataGrid.Columns[6]).GetCellContent(i) as CheckBox);

Which is the DataGridCheckBoxColumn, returns a nullException, even though it is the right column. If I WriteLine dataGrid.Columns[6], I get "System.Windows.Controls.DataGridCheckBoxColumn", so I'm sure I'm in the right place but I cannot set it to true.

score 0 · Answer 1 · answered Nov 06 '19 at 23:02

Try adding Binding="{Binding IsChecked, UpdateSourceTrigger=PropertyChanged}" attribute to your DataGridCheckBoxColumn, like this:

<DataGridCheckBoxColumn Header="Check" IsReadOnly="False" Width="50" Binding="{Binding IsChecked, UpdateSourceTrigger=PropertyChanged}" >
    ...

Also you can check the following stack overflow question: How to perform Single click checkbox selection in WPF DataGrid with IEditableObject object

Toggle Checkbox value after validation

1 Answers1