CODEWITHSUNDEEP
c#.nettypesinterface
WDUK
WDUK

Reputation: 1524

Interfaces with type override C#

I am trying to setup my waypoint system in a more flexible way so i can use derived classes for more customisation but i am stuck with how to set the ability to define the derived type to it.

I have the interface like this:

public interface ISegment
{
    IWaypoint WaypointA { get; set; }
    IWaypoint WaypointB { get; set; }
}

And my Segment has:

public class Segment : ISegment
{
    private Waypoint _waypointA;
    public IWaypoint WaypointA
    {
        get => _waypointA;
        set => _waypointA = value;
    }

    private Waypoint _waypointB;
    public IWaypoint WaypointB
    {
        get => _waypointB;
        set => _waypointB = value;
    }
}

Waypoint Class:

public class Waypoint : IWaypoint 
{

     public Vector3 Position {get; set;} // from IWaypoint

     //...custom logic ... //
}

Where Waypoint is my derived class with all my custom logic. But i can't do it this way because it won't convert the IWaypoint to the backing field _waypoint of type Waypoint : IWaypoint.

What is the correct way to set this up so i can apply my own custom waypoint class but still have the rigid contract setup that an interface demands?

Upvotes: 1

Views: 69

Answers (1)

Kirill Polishchuk
Kirill Polishchuk

Reputation: 56162

Probably you can implement ISegment explicitly, i.e.:

public class Segment : ISegment
{
    public Waypoint WaypointA { get; set; }

    IWaypoint ISegment.WaypointA
    {
        get => WaypointA;
        set => WaypointA = (Waypoint) value; // throw an exception if value is not of type Waypoint
    }
}

public interface IWaypoint { }

public class Waypoint : IWaypoint { }

public interface ISegment
{
    IWaypoint WaypointA { get; set; }
}

Upvotes: 1

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