public void OperatorKw_As()
{
//ARRANGE
BusinessCustomer cust = new BusinessCustomer {
Name = "Stefan", BusinessTel = "+4498347"
};
Customer customer = new Customer();
//ACT
Customer bcCastAble = cust as Customer;
PrivateCustomer custNotCastAble = customer as PrivateCustomer;
//ASSERT - Versucht eine Instanz zu Casten. Ist null im Fehlerfall. (Besonderheit: Es wird keine Exception geworfen)
bcCastAble.Should().NotBeNull("BusinessCustomer should be castable to Customer");
custNotCastAble.Should().BeNull("Customer can not be casted to PrivateCustomer but the other way round");
}
public void OperatorKw_Is()
{//https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/is
//ARRANGE
PrivateCustomer pc = new PrivateCustomer();
Customer cust = new BusinessCustomer {
Name = "Stefan", BusinessTel = "+4498347"
};
//ACT
bool isPrivateCustomerACustomer = (pc is Customer) ? true : false;
bool isCustomerABusinessCustomer = (cust is BusinessCustomer) ? true : false;
//ASSERT - Überprüfen ob Instanz eines Objektes von bestimmtem Typ ist
isPrivateCustomerACustomer.Should().Be(true, "expr is an instance of a type that derives from type");
isCustomerABusinessCustomer.Should().Be(true);
}
