How do I pass an interface as a parameter to a method?

Question

I am a newbie to C#. Could you please tell me how to pass an interface as a parameter to a method?
i.e. I want to access the interface members(property) and assign the values to it and send that interface as a parameter to another method.

Say for example if I have an interface as IApple which has members as property int i and int j I want to assign values to i and j and send the whole interface as a parameter say like this

Method(IApple var);

Is it possible? Sorry if am poor at basics please help me out. thanks in advance

Answer 1

Sure this is possible

public interface IApple
{
    int I {get;set;}
    int J {get;set;}
}

public class GrannySmith :IApple
{
     public int I {get;set;}
     public int J {get;set;}

}

//then a method

public void DoSomething(IApple apple)
{
    int i = apple.I;
    //etc...
}

//and an example usage
IApple apple = new GrannySmith();
DoSomething(apple);