protected override string?OnCanDelete(T entity)
{
S state = Graph <T, S> .GetStateFunc(entity);
if (!FromStates.Contains(state))
{
return(OperationMessage.StateShouldBe0InsteadOf1.NiceToString().FormatWith(
FromStates.CommaOr(v => ((Enum?)(object?)v)?.NiceToString() ?? "null"),
((Enum?)(object?)state)?.NiceToString() ?? "null"));
}
return(base.OnCanDelete(entity));
}
protected override string OnCanExecute(T entity)
{
S state = Graph <T, S> .GetStateFunc(entity);
if (!FromStates.Contains(state))
{
return(OperationMessage.StateShouldBe0InsteadOf1.NiceToString().FormatWith(
FromStates.CommaOr(v => ((Enum)(object)v).NiceToString()),
((Enum)(object)state).NiceToString()));
}
return(base.OnCanExecute(entity));
}