CODEWITHSUNDEEP
c#
syed
syed

Reputation: 7

cannot implicitly convert type customB customC

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            C c = new C();
            c = new B();

        }
    }

    class B
    {

    }
    class C : B
    {

    }

}

please can anyone explain this error ? i am new to coding. i want to check the properties of hiding and overriding the methods. your efforts are highly appreciated

Upvotes: 0

Views: 82

Answers (3)

Lucas Trzesniewski
Lucas Trzesniewski

Reputation: 51430

You are trying to assign a B to a C, which is not correct is every case. Try to rename the objects to make it easier:

class Animal
{
}

class Dog : Animal
{
}

class Program
{
    static void Main(string[] args)
    {
        Dog dog = new Dog ();
        dog = new Animal(); // Oops ! Not possible
    }
}

A Dog is always an Animal, but every Animal is not necessarily a Dog.

The following would be correct though:

Animal animal = new Dog(); // Possible
animal = new Animal(); // Possible too

Although in this case, Animal probably deserves to be abstract (so you wouldn't be able to create one in the first place - you'd have to create a concrete class).

Upvotes: 3

Steven Dall
Steven Dall

Reputation: 174

if you are new to coding I don't want to throw technical things at you. so i'll explain it this way.

you can always convert in 2 cases. 1. the object you are converting from, and to, have a predefined converter created and called 2. the object you are trying to convert from is made up of the smaller object you are trying to convert to.

such as

in life we can assume

 Orange : Fruit

so we can say

eat((Fruit)orange)

because orange is made up of a lower class Fruit.

however to convert a Fruit to Orange you cannot do because Orange is more complex than just Fruit, and also who is to say this Fruit wasn't a Banana, 2 very different things, although still Fruit

As Commented "All oranges are fruit, but not all fruit are oranges"

Upvotes: 0

axwcode
axwcode

Reputation: 7824

The problem is that C is of type B, but B is not of type C.

It would work if you wrote it like this:

 B b = new C();
 b = new B();

Upvotes: 0

Related Questions