Accessing of interface methods

Question

Actually the code below is Simple example of interface.But it showing an error 'PublicDemo.DemoPublic' does not implement interface member 'PublicDemo.demo1.two()'. 'PublicDemo.DemoPublic.two()' cannot implement an interface member because it is not public.

namespace PublicDemo
{
public interface demo
{
    void Demo();
}
public interface demo1:demo
{
    void one();
    void two();
}


class DemoPublic :demo1
{
    protected internal string variable;

   public void Demo()
    {
        Console.WriteLine("{0}", variable);

    }
    public void one()
    {
        Console.WriteLine("this is one method");
    }
    protected void two()
    {
        Console.WriteLine("this is two method");
    }


}


class Excute : DemoPublic
{
    static void Main(string[] args)
    {
        Excute Dp = new Excute();
        Dp.variable = Console.ReadLine();
        Dp.Demo();
        Dp.one();
        Dp.two();

        Console.ReadKey();

    }

}
}

i need why it is not working

Why is it protected Void Two()?

Rangesh
– Rangesh

2014-07-11 06:42:49 +00:00
Commented Jul 11, 2014 at 6:42 — Rangesh
– Rangesh, Commented Jul 11, 2014 at 6:42

Yuliam Chandra · Accepted Answer · 2014-07-11 06:42:25Z

1

Change

protected void two()
{
    Console.WriteLine("this is two method");
}

into

public void two()
{
    Console.WriteLine("this is two method");
}

answered Jul 11, 2014 at 6:42

Yuliam Chandra

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6 Comments

Yuliam Chandra Over a year ago

@Kireet, interface is a contract that means all implementations have to agree to implement public methods

Kireet Over a year ago

one more doubt .is it possible to declare interface as protected

user3613916 Over a year ago

Yes, you can modify accessibility of interface itself, but not of its members. You can work around this using explicit interface implementation.

Sriram Sakthivel Over a year ago

@Kireet If it is the nested interface you can make it protected, otherwise not.

Kireet Over a year ago

can you give a simple example of multiple interfaces

|

Sriram Sakthivel · Accepted Answer · 2014-07-11 06:47:23Z

1

You yourself answered the question:

'PublicDemo.DemoPublic.two()' cannot implement an interface member because it is not public.

Answer is Interface members have to be public.

answered Jul 11, 2014 at 6:47

Sriram Sakthivel

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Comments

Community · Accepted Answer · 2020-06-20 09:12:55Z

0

It means what is says. Your two method is protected. It needs to be public if implemented from an interface.

protected void two(){

    Console.WriteLine("this is two method");
}

change it to public

edited Jun 20, 2020 at 9:12

CommunityBot

11 silver badge

answered Jul 11, 2014 at 6:45

Guy Lowe

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Comments

Rangesh · Accepted Answer · 2014-07-11 06:44:56Z

0

Change Protected to Public.You have defined an public Interface.Once you define Public Interface,the Contracts in the Interface also will be public by Default.

public void two()
{
    Console.WriteLine("this is two method");
}

answered Jul 11, 2014 at 6:44

Rangesh

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