Disable / Enable Button Using DataGridTextColumn Check

Question

I have a DataGrid :

 <DataGrid ItemsSource="{Binding CustomerXml}" Name="customersDataGrid" AutoGenerateColumns="False" DataContext="{Binding}"> <DataGrid.Columns> <DataGridTextColumn Header="Name"> <DataGridTextColumn.Binding> <Binding Path="Name" ValidatesOnDataErrors="True" UpdateSourceTrigger="PropertyChanged" NotifyOnValidationError="True"> <Binding.ValidationRules> <local:NameValidationRule/> </Binding.ValidationRules> </Binding> </DataGridTextColumn.Binding> </DataGridTextColumn> ... </DataGrid.Columns> </DataGrid> 

and I'm trying to disable and enable the save button using the result of a ValidationRule .

 <Button Content="Save" Name="save" Click="save_Click"> <Button.Style> <Style TargetType="{x:Type Button}"> <Setter Property="IsEnabled" Value="false" /> <Style.Triggers> <MultiDataTrigger> <MultiDataTrigger.Conditions> <Condition Binding="{Binding ElementName=customersDataGrid, Path=(Validation.HasError)}" Value="false" /> </MultiDataTrigger.Conditions> <Setter Property="IsEnabled" Value="true" /> </MultiDataTrigger> </Style.Triggers> </Style> </Button.Style> </Button> 

But if ValidationResult set to true or false, the button is still disabled.

Answer 1

So, I found a solution:

  int count = 0; private void customersDataGrid_Error(object sender, ValidationErrorEventArgs e) { if (e.Action == ValidationErrorEventAction.Added) { save.IsEnabled = false; count++; } if (e.Action == ValidationErrorEventAction.Removed) { count--; if (count == 0) save.IsEnabled = true; } }