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GeneralRe: project file associated with c# application on start Pin
OriginalGriff15-Jan-17 2:23
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GeneralRe: project file associated with c# application on start Pin
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QuestionCan't understand implementation of interface Pin
Mc_Topaz14-Jan-17 4:07
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OriginalGriff14-Jan-17 4:48
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SuggestionRe: Can't understand implementation of interface Pin
Richard Deeming16-Jan-17 3:18
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AnswerRe: Can't understand implementation of interface Pin
BillWoodruff17-Jan-17 17:49
professionalBillWoodruff17-Jan-17 17:49 
Everything declared in an Interface, when you implement it in a class, must have the access modifier 'public. This "default" implementation syntax can be called implicit implementation.

The exception, which does confuse people, is the special case where you have a class that implements more than one Interface and identical names are used in each Interface, and you need to make it clear, for a duplicated name implementation, which Interface your implementation refers to.

So, when explicit implementation is used: no modifiers are allowed; and, the Interface name is followed by a dot, and the declaration.

The examples here should make this clear: [^].

If you are one of those curious persons who dares ask why you can't have access modifiers in Interfaces, and/or why you can't use other modifiers than 'public in your implementation of Interfaces; you may wish to read this thread: [^].

Suppose your class implements one Interface, and you make every implementation explicit:
public interface IStuff
{
    void SPB(string a, DateTime d, string c);
    void P(decimal a, string r);
    void EPB();

    string Name { set; get; }
}

public class Test : IStuff
{
    void IStuff.SPB(string a, DateTime d, string c)
    {
        throw new NotImplementedException();
    }

    void IStuff.P(decimal a, string r)
    {
        throw new NotImplementedException();
    }

    void IStuff.EPB()
    {
        throw new NotImplementedException();
    }

    private string _name;

    string IStuff.Name
    {
        get { return _name; }
        set { _name = value; }
    }
}
When you create an instance of this class, none of its methods, and its one field, can be accessed from the instance: you'll have to cast the instance to the Interface:
// in some method, or class initializer, or eventhandler:
var test = new Test();

// causes error
// test.Name = "fail";

// okay
(test as IStuff).name = "wtf ?";

«There is a spectrum, from "clearly desirable behaviour," to "possibly dodgy behavior that still makes some sense," to "clearly undesirable behavior." We try to make the latter into warnings or, better, errors. But stuff that is in the middle category you don’t want to restrict unless there is a clear way to work around it.» Eric Lippert, May 14, 2008


modified 18-Jan-17 2:48am.

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