Any idea why this List setter is not working?

Question

I have a setter for a list which is not firing. Adding a breakpoint doesn't even halt execution, it's like it's just not running the code at all. Any tips or advice on why it's not working?

private List<OrderLine> _orderLines = new();

public List<OrderLine> OrderLines
    {
        set
        {
            // Adding a breakpoint here has no effect,
            // and the NotifyPropertyChanged function
            // doesn't get called either
            if (value != this._orderLines)
            {
                this._orderLines = value;
                Recalculate();
                NotifyPropertyChanged();
            }
        }
        get
        {
            return this._orderLines;
        }
    }

    ...
    
    // I am adding to the order lines like this
    order.OrderLines.Add(line)

Answer 1

The setter will only be called if you use order.OrderLines = new List<OrderLine>() then the setter will be called otherwise you get the Value from it with the getter.