CODEWITHSUNDEEP
c#wpfvalidationxaml
WAKU
WAKU

Reputation: 349

WPF: How can I disable one button if my window has any validation error?

I have some (>20) controls in a window, each is bound to a property of a ViewModel.

The ViewModel implements IDataErrorInfo, in order to do some validations, and it works well.

Now I add a button something like "Commit" to the window. I want to disable the button if any control has validation error.

Although I can use DataTrigger to do the trick like this:

<Button Content="Commit">
    <Button.Style>
        <Style>
            <Style.Triggers>
                <DataTrigger Binding="{Binding ElementName=control1, Path=(Validation.HasError)}" Value="True">
                    <Setter Property="Button.IsEnabled" Value="False" />
                </DataTrigger>
                <DataTrigger Binding="{Binding ElementName=control2, Path=(Validation.HasError)}" Value="True">
                    <Setter Property="Button.IsEnabled" Value="False" />
                </DataTrigger>
                <!-- DataTriggers for control3, 4, 5... -->
            </Style.Triggers>
        </Style>
    </Button.Style>
</Button>

That'll be a long XAML code because I have 20+ controls in this window, so I wonder is there a better solution?

Upvotes: 1

Views: 800

Answers (1)

Vlad
Vlad

Reputation: 1439

Maybe you should create a command in ViewModel. Something like this:

class ViewModel
{
    public ICommand CommitCommand{ get; private set; }

    public ViewModel()
    {
        CommitCommand = new RelayCommand(Commit, CanCommit);
    }

    private void Commit(object parameter)
    {
        // button click handler
    }

    private bool CanCommit(object parameter)
    {
        // check: view model has errors
    }
}

Implement ICommand interface you can get here: Wpf Tutorial

Xaml code:

<Button Command={Binding CommitCommand}/>

Upvotes: 3

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