Question

i’m learning C#.
ok, i have a problem:
i have a class :

 class Couple{
     private double first{private set; public get;}
     private double second{private set; public get;}
 }     

first question: am i right, that these properities have public getter and private setter? (it’s sounds strange, i know, but need to know difference between private/public field and private/public property with public/private set/get )

and second question.

if i want a class :

   class AnyCouple{
        public Type AnyCouple {public set; public get;}
        private AnyCouple first{private set; public get;}
        private AnyCouple second{private set; public get;}
   }

how to make it?
dummy questions, i know, sorry

Answer 1

For your first question, yes, you are right. The properties first and second have a private setter and a public getter. However, as written, your code won’t compile. If you specify an access modifier on a getter or setter it must be more restrictive than the access modifier for the property and you can’t specify an access modifier on both properties. Additionally, note that in idiomatics C#, we write the getter first and setter second and we give properties PascalCase names like

public double First { get; private set; }

This will achieve a property named First with a public getter and a private setter and it is written idiomatically.

For your second question, you should use generics. You could do it all like this:

public class MyTuple<T1, T2> {
    private readonly T1 first;
    public T1 First { get { return this.first; } }
    private readonly T2 second;
    public T2 Second { get { return this.second; } }
    public MyTuple(T1 first, T2 second) {
        this.first = first;
        this.second = second;
    }
}

But, this is already built in to the .NET Framework. You can just use Tuple<T1, T2>. Note that its Item1 and Item2 properties (analogous to your first and second) have a public getter; it is backed by a private readonly field.