接口无法封装方法

问题描述

我了解到接口也用于封装方法，但是在下面的代码中，通过将ojb转换为MainClass，我可以从Mainclass访问其他方法，我没有在接口中声明，所以现在封装发生在哪里。

As I learn that interface is also used for encapsulate method but in the following code by casting ojb to MainClass I am able to access other method from Mainclass which I did not declare in interface so now where is encapsulation occur.

class Program
{
    static void Main(string[] args)
    {
        IInterface obj = new MainClass();
        Console.WriteLine(((MainClass)obj).FullName()+" " +obj.LastName());
        Console.WriteLine(((MainClass)obj).SayHello());
        Console.ReadKey();
    }
}

public interface IInterface
{
    string LastName();
}

public class MainClass:IInterface
{
    public  string FullName()
    {
        return "Raman Singh";
    }
    public string SayHello()
    {
        return "Hello Sir111";
    }

    public string LastName()
    {
        return "Chauhan";
    }
}

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