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Does C# support multiple inheritance? Either way give some example.
Thanks.
Posted

Only a weak form of multiple inheritance: strictly one parent class, but multiple interfaces are allowed. The only exclusion is the class System.Object which does not have a base class. If no base class is specified, it means that a base class still exist; this implied base class is System.Object.

C#
interface MyInterface1 { void Method(); }
interface MyInterface2 { void Method(); }

//this is fine:
class MyClass : System.Windows.Form, MyInterface1, MyInterface2 {
    void MyInterface1.Method() {}
    void MyInterface2.Method() {}
}

//this will not compile, failed at attempt to add another base class MyClass:
class MyClass : System.Windows.Form, MyClass, MyInterface1 {
    void MyInterface1.Method() {}
}


—SA
   
v3
Comments
Dima Popov 3-Mar-11 16:19pm
   
Surely a better answer.
   
Thank you.
--SA
AHBB 3-Mar-11 16:20pm
   
class P:c1 //how to call c2 & c3 after c1?
{

}
class c1
{ }
class c2
{ }
class c3
{ }
   
Incorrect question. Classes are not called, method and properties are (yes, properties, too).
If you question is about the order of declaration -- it does not matter. This is not C/C++!

--SA
AHBB 3-Mar-11 16:44pm
   
thanks
   
You're welcome.
Thank you for accepting my Answer.

Good luck, call again.
--SA
We can use multiple inheritance in c++ but C# never support for multiple inheritance. Instead of that we can use interface concept in C#.
   
No, but internally every class inherits object.
   
Comments
AHBB 3-Mar-11 16:16pm
   
no clear
   
Incomplete answer, also, you "but" is irrelevant.
--SA
Dima Popov 3-Mar-11 16:23pm
   
Is that just irrelevant or technically incorrect?
   
Dima, "No" is questionable, because of the term "weak form of multiple inheritance". You see, technically interface layout matches the layout of the class with no data and all abstract method (as it was historically implemented this way and makes full sense); I mean "weak form of multiple inheritance" is still multiple inheritance. Enough said. As to the System.Object as a common ancestor -- it is the unrelated fact. One can create systems with singular or multiple inheritance and with single or multiple common ancestors in all combination without interference between these two factors -- these aspects are orthogonal to each other.

--SA
   
I'm sorry. Mentioning of System.Object still makes the following sense: in the sense of "multiple inheritance" what multiplicity is applied to a .NET class? 0..INF for base interfaces, strictly 1 (not 0) for base classes. Why not 0? Because if no base class is declared, there is an implied base class which is System.Object.
"every class inherits object" in not quite accurate, because you need to make difference between direct and indirect inheritance. In the indirect sense, this can be inferred from the above rule.
--SA
Dima Popov 4-Mar-11 1:48am
   
Thank you for taking your time to answer. I learned a lot.
   
You're very welcome.
--SA
AHBB 3-Mar-11 16:41pm
   
Incompleteness
Dima Popov 3-Mar-11 16:56pm
   
SA gave you the full answer. What I meant was that you can't declare a class like C: B, A though C: B is actually C: B, object. Please, correct me if I'm wrong
This[^] might give you an idea.

HONESTLY SAY NO, USE INTERFACE INSTEAD OF MULTIPLE INHERITANCE.
   
v2
Did you try it? 5 minutes of coding would have answered the question. I'm sure your teacher wants you to find out yourself.
   

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