class property access in parent only

Question

hi, i'm new to c#, i want solve this problem :

public class Location
    {
        public int X { get; set; }
        public int Y { get; set; }

        public Location() : this(0, 0) { }
        public Location(int x, int y)
        {
            X = x;
            Y = y;
        }
    }

    public class Car
    {
        public Location CurrentLocation { get; 
        private set; }

        void SomeCarMethod()
        {
            CurrentLocation.X = 5;                // it's ok

            CurrentLocation = new Location(1, 2); // not preferred 
        }
    }

    public class TempClass
    {
        public Car MyCar { get; set; }

        void TempMethod()
        {
            MyCar.CurrentLocation.X = 6;     // it works **but** I don't want X to be accessible here

            var t = MyCar.CurrentLocation.X; // it's ok

        }
    }

i'm using c# wpfCore3.1 vs2019

Answer 1

You can use interface ILocation and a private Location class

public interface ILocation
{
    int X { get; }
    int Y { get; }
}

public class Car
{
    private Location _currentLocation;
    public ILocation CurrentLocation => _currentLocation;

    public void SomeCarMethod()
    {
        _currentLocation.X = 5;                // it's ok
        _currentLocation = new Location(1, 2); // not preferred 
    }

    private class Location : ILocation
    {
        public int X { get; set; }
        public int Y { get; set; }

        public Location() : this(0, 0) { }

        public Location(int x, int y)
        {
            X = x;
            Y = y;
        }
    }
}

public class TempClass
{
    public Car MyCar { get; set; }

    public void TempMethod()
    {
        MyCar.CurrentLocation.X = 6;     // X is not accessible here
        var t = MyCar.CurrentLocation.X; // it's ok
    }
}

or a Location class and a private RwLocation class

public class Location
{
    public int X { get; }
    public int Y { get; }
}

public class Car
{
    private RwLocation _currentLocation;
    public Location CurrentLocation => _currentLocation;

    public void SomeCarMethod()
    {
        _currentLocation.X = 5;                  // it's ok
        _currentLocation = new RwLocation(1, 2); // not preferred 
    }

    private class RwLocation : Location
    {
        public int X { get; set; }
        public int Y { get; set; }

        public RwLocation() : this(0, 0) { }

        public RwLocation(int x, int y)
        {
            X = x;
            Y = y;
        }
    }
}

public class TempClass
{
    public Car MyCar { get; set; }

    public void TempMethod()
    {
        MyCar.CurrentLocation.X = 6;     // X is not accessible here
        var t = MyCar.CurrentLocation.X; // it's ok
    }
}