XebiaLabs.Deployit.UI.Validation.ValidatableViewModel.this C# (CSharp) Méthode

        public string this[string columnName]
        {
            get
            {
                var errors = Validate(this, columnName);
                return errors.Count == 0
                    ? string.Empty
                    : string.Join(", ", errors.ToArray());
            }
        }