public Chain AddToChain(Chain node)
{
if (next == null)
{
next = node;
}
else
{
next.AddToChain(node);
}
return(this);
}
static void Main(string[] args)
{
var chain = new Chain();
chain.AddToChain(new Addition())
.AddToChain(new Subtraction())
.AddToChain(new Multiplication());
Numbers numbers = new Numbers(5, 10, OperationType.Mul);
var result = chain.Calculate(numbers);
Console.WriteLine(result);
}