C#•15mo ago

❔ Display error message if value out of limit

Hi, i'm using wpf with mvvm pattern and i'd like to know if it's good to do this in order to display a message error if the value enter isn't good :

public class StepNormalViewModel : StepViewModel
    {
        private readonly StepNormal _stepNormal;

        private double _aV;
        public double AV
                {
                    get => _aV;
                    set
                    {
                        if(StepCheck.CheckAV(_aV))
                        {
                            _stepNormal.AV = _aV;
                            _aV = value;
                            OnPropertyChanged();
                        }
                        else
                        {
                            //*Display my Error forms*
                        }
                    }
                }
}

public class StepNormalViewModel : StepViewModel
    {
        private readonly StepNormal _stepNormal;

        private double _aV;
        public double AV
                {
                    get => _aV;
                    set
                    {
                        if(StepCheck.CheckAV(_aV))
                        {
                            _stepNormal.AV = _aV;
                            _aV = value;
                            OnPropertyChanged();
                        }
                        else
                        {
                            //*Display my Error forms*
                        }
                    }
                }
}

3 Replies

cap5lut•15mo ago

afaik, usually u have an extra property for the validity state and validation errors u would bind to ur view and simply set these in ur setter. so basically the displaying the error would be something like

else
{
  AvIsValid = false;
  AvValidationErrorMessage = "aint a valid value cuz blah";
]

else
{
  AvIsValid = false;
  AvValidationErrorMessage = "aint a valid value cuz blah";
]

tho i never used wpf, it might have something built-in for this as well

ElioOP•15mo ago

ok thanks for the info i will look into it 🙂

Accord•15mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Display error message if value out of limit