inherit from two classes in C

Question

Possible Duplicate  Multiple Inheritance in C    I have two classes Class A and Class B  These two classes cannot inherit each other  I am creating new class called Class C  Now  I want to implement the methods in class A and class B by inheriting  I am aware that multiple inheritance is not possible in C  but is there any other way to do this

User · Answer

You can define a base class for A and B where you can hold a common methods properties fields of those   After implement C Base    Or in order to simulate multiple inheritance  define a common interface s  and implement them in C  Hope this helps

User · Answer

Use composition   class ClassC       public ClassA A   get  set        public ClassB B   get  set            public C  ClassA  a  ClassB  b                this A   a          this B   b            Then you can call C A DoA    You also can change the properties to an interface or abstract class  like public InterfaceA A or public AbstractClassA A

User · Answer

Do you mean you want Class C to be the base class for A  amp  B in that case   public abstract class C       public abstract void Method1         public abstract void Method2       public class A   C       public override void Method1                 throw new NotImplementedException               public override void Method2                 throw new NotImplementedException              public class B   C       public override void Method1                 throw new NotImplementedException               public override void Method2                 throw new NotImplementedException

User · Answer

An common alternative to inheritance is delegation  also called composition   X  has a  Y rather than X  is a  Y  So if A has functionality for dealing with Foos  and B has functionality for dealing with Bars  and you want both in C  then something like this   public class A       private FooManager fooManager   new FooManager        or inject  if you have IoC     public void handleFoo Foo foo        fooManager handleFoo foo          public class B       private BarManager barManager   new BarManager        or inject  if you have IoC     public void handleBar Bar bar        barManager handleBar bar          public class C       private FooManager fooManager   new FooManager        or inject  if you have IoC    private BarManager barManager   new BarManager        or inject  if you have IoC         etc

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Make two interfaces IA and IB   public interface IA       public void methodA int value      public interface IB       public void methodB int value       Next make A implement IA and B implement IB   public class A   IA       public int fooA   get  set        public void methodA int value    fooA   value       public class B   IB       public int fooB   get  set        public void methodB int value    fooB   value        Then implement your C class as follows   public class C   IA  IB       private A  a      private B  b       public C A  a  B  b                this  a    a          this  b    b             public void methodA int value     a methodA value         public void methodB int value     b methodB value         Generally this is a poor design overall because you can have both A and B implement a method with the same name and variable types such as foo int bar  and you will need to decide how to implement it  or if you just call foo bar  on both  a and  b  As suggested elsewhere you should consider a  A and  B properties instead of combining the two classes

User · Answer

If you want to literally use the method code from A and B you can make your C class contain an instance of each  If you code against interfaces for A and B then your clients don t need to know you re giving them a C rather than an A or a B   interface IA   void SomeMethodOnA      interface IB   void SomeMethodOnB      class A   IA   void SomeMethodOnA        do something        class B   IB   void SomeMethodOnB        do something        class C   IA  IB       private IA a   new A        private IB b   new B        void SomeMethodOnA     a SomeMethodOnA          void SomeMethodOnB     b SomeMethodOnB

User · Answer

Multitiple inheritance is not possible in C   however it can be simulated using interfaces  see Simulated Multiple Inheritance Pattern for C    The basic idea is to define an interface for the members on class B that you wish to access  call it IB   and then have C inherit from A and implement IB by internally storing an instance of B  for example   class C   A  IB       private B  b   new B            IB members     public void SomeMethod                  b SomeMethod              There are also a couple of other alternaitve patterns explained on that page

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