Question

I’m looking for a way that a Tuple property can receive several tuples like Tuple<int>, Tuple<string>. The next code is an example that I’m trying to do:

public class A
{
    public virtual Tuple Condition
    {
        get;
        set;
    }
}

public class B: A
{
    public override Tuple<int, string> Condition
    {
        get;
        set;
    }
}

I’d like to use the Condition property from A class, and use it in other classes like B and asign it an specific Tuple.

B b = new B();
B.Condition = Tuple.Create(2, "Bella");

A a = b;
a.Condition  // Here must show B.Condition

Answer 1

Two problems with this approach:

1. Tuple<T1, T2> and Tuple are different classes, and method/property overrides don’t support polymorphism in the return types.

2. Even if they did, Tuple<T1, T2> does not inherit from Tuple, so it wouldn’t work anyway.

You would need to declare the virtual property to be of object and then just cast back and forth when needed. Alternatively, you may want to think about what your Condition property really represents; perhaps a custom class will prove more flexible than Tuples.