setter for a property not defined in the interface

Question

If my interface has the signature only for getter such as:

public interface IInterface 
{
   object Id{get;}
}

So the interface only dictates a public getter for Id on any implemented class now when i have the class :

public class Simple : IInterface
{
  object Id
  {
    get{return something;} 
    set{ do something else;}
  }
}

the compiler complains about the setter as the setter is not defined in the interface. However I didnt dictate anything on the interface contract for a setter; why does the interface insist on the setter on the derived classes ?

Answer 1

You just need to make Id public. For example, this compiles fine:

public interface IInterface
{
    object Id { get; }
}
public class Simple : IInterface
{
    private int something;
    public object Id
    {
        get { return something; }
        set{ something = (int)value;}
    }
}