WPF Trigger binding to MVVM property

Question

I have a datatemplate containing an image that I want to be hidden if the the value of a property in a ViewModel is true. Can anyone tell me why the the xaml below does not

Answer 1

In my opinion we not need to use Triggers, with only the Binding it works well. To make binding to a property model, you can use BooleanToVisibilityConverter Is declared as follows:

And how to use it is simple, just point to the key stated above:

The property in the ViewModel:

private bool _hasError = false;
    public bool HasError
    {
        get { return !string.IsNullOrEmpty(_messageError); }
        set 
        {
            _hasError = value;                
            this.NotifyOfPropertyChange(() => this.HasError);
        }
    }