Caliburn Micro Guard Methods not evaluating on property change

Question

I\'ve been playing with the Caliburn Micro MVVM framework and am having some problems with guard methods.

I have a view model:

public class MyViewModel :         


        

Answer 1

Ok I figured it out. I didn't realise that you have to fire the guard method notification, thought the framework did that, but it makes sense.

So I change my property setter to:

public DateTime? Date
{
   get
   {
      return this.date; 
   }
   set
   {
      this.date = value;
      this.NotifyOfPropertyChange(() => Date);
      this.NotifyOfPropertyChange(() => CanCalculate);
   }
}

and changed my CanCalculate method to a property:

public bool CanCalculate
{
    get
    {
        return this.Date.HasValue;
    }
}

And all works fine now :)