Interface In C#

• In C# we can define an Interface using Interface key word. Define

    //Difine an Interface

    interface MyInterface

    {

} 

• Interfaces can be consisting of methods, properties, events, indexers or any combination of those types.
• By default all the interface members are Public. So if we use any access modifiers it will prompt compile time error.
• Add Interface methods have only declarations, not method implementations.
• Class can be inherited by more than one Interface.
• Interface can be inherited from other interface as well.
• Interface not allows creating instances. 

    //Difine an Interface

    interface MyInterface

    {

        void MyMethods();

        void MyMethods2();

    }

    class clsMyClass : MyInterface

{

    //Can’t create Privet member

        public void MyMethods()

        {

            //Method Implementation

            Console.WriteLine("Implement Method MyMethods()");

        }

        public void MyMethods2()

        {

            //Method Implementation

            Console.WriteLine("Implement Method MyMethods2()");

        }

        public static void Main()

        {

            clsMyClass oclsMyClass = new clsMyClass();

            oclsMyClass.MyMethods();

            oclsMyClass.MyMethods2();

        }

    } 

• When inherit from an Interface need to provide the implementation for all methods. Unless a compile error will be generated.
• If the Class or struct is unable to provide the implementation for all methods, which are in the Interface have to be marked as Abstract.

//Difine an Interface

    interface MyInterface

    {

        void MyMethods();

        void MyMethods2();

    }

    class clsMyClass : MyInterface

    {

        public void MyMethods()

        {

            //Method Implementation

            Console.WriteLine("Implement Method MyMethods()");

        }

        //No Implementation

        abstract public void MyMethods2();

        public static void Main()

        {

            clsMyClass oclsMyClass = new clsMyClass();

            oclsMyClass.MyMethods();

            oclsMyClass.MyMethods2();

        }

    }

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