Type Match in C# using FuncSharp

TypeMatch.cs

class Parent { }
class A : Parent { public string A { get; private set; } }
class B : Parent { public string B { get; private set; } }
class C : Parent { public string C { get; private set; } }
 
public class Test
{
    public string TestWithoutFuncSharp(Parent p)
    {
        var a = p as A;
        if (a != null)
        {
            return a.A;
        }
        var b = p as B;
        if (b != null)
        {
            return b.B;
        }
        var c = p as C;
        if (c != null)
        {
            return c.C;
        }
        throw new ArgumentException(); // or return "otherwise".
    }
 
    public string Test(Parent p)
    {
        return p.AsUnion<A, B, C>().Match(
            a => a.A,
            b => b.B,
            c => c.C
        );
    }
 
    public string SafeTest(object x)
    {
        return x.AsSafeUnion<A, B, C>().Match(
            a => a.A,
            b => b.B,
            c => c.C,
            _ => "otherwise"
        );
    }
}