我可以在C＃中将一个子类类型转换为其他子类对象

Question

I want to type cast a below:

Class A
{
}

Class B : A
{
}

Class C: A
{
}
Class D{
B b = new b();
C c = (C) b;
}

Please suggest how can I type cast class C to Class B

Answer 1

No, that's not possible since B is not a C, so this cast must fail. One workaround would be to implement a custom explicit conversion operator but otherwise there is no way - you can only cast to a more specific type (downcast) or to a base class (upcast) in the same inheritance tree.

Answer 2

You can not. What you can is cast B to A.

Answer 3

It's simply impossible. You can't to such conversion.

In fact they have same base class, but they aren't same. For example, take a look at this.

Triangle is Shape and Rectangle is Shape

But you can't convert Triangle to Rectangle , because they are different.

Answer 4

No, you can't. If you want to copy properties from one class to another, you might consider AutoMapper .

Answer 5

Not possible. Classes C and B are not related in the class hierachy.

Answer 6

Animal
{
}

Giraffe : Animal
{
}

Shark : Animal
{
}

Your question is how do you turn a Giraffe into a Shark. Unfortunately, it can't be done.