How to force the use of a private method, since interface methods are only publicly available?

Question

The interface can be used to enforce methods, but they must be publicly available.

What if I want to use private methods?

Update: this is not about preventing the call, but to ensure that the private method has been DONE.

Therefore, I do not want to use the interface as such. I want to impose some kind of coding style on the team.

Answer 1

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public abstract class A
{
    protected abstract void Foo();
}

public class B : A
{
    protected override void Foo() { }
}

, Foo B Foo() B.

Edit:

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public interface IFooWorker
{
    void DoWork();
    int CalculateSomething();
}

public class Foo
{
    private FooWorker _worker;
    private int _currentValue;
    private string _workStatement;


    public Foo()
    {
        _worker = new FooWorker(this);
    }

    private class FooWorker : IFooWorker
    {
        private Foo _outer;
        public FooWorker(Foo foo)
        {
            _outer = foo;
        }

        public void DoWork()
        {
            _outer._currentValue = CalculateSomething();
            _outer._workStatement = "I did work";
        }

        public int CalculateSomething()
        {
            return 42;
        }
    }

}

Answer 2

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Answer 3

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Answer 4

"private", .

: http://msdn.microsoft.com/en-us/library/ms173157.aspx

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Answer 5

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Answer 6

This does not make sense, since the private method declared in the interface cannot be called.