How to design an immutable object with complex initialization

Question

I\'m learning about DDD, and have come across the statement that \"value-objects\" should be immutable. I understand that this means that the objects state should not change aft

Answer 1

I have been boggled with the same question as complex constructors is also bad design to me. I am also not a big fan of the builder concept as it seems like too much extra code to maintain. What we need is popsicle immutability, which means that an object starts out as mutable where you are allowed to use the property setters. When all properties are set there must be a way of freezing the object into an immutable state. This strategy is unfortunately not supported natively in the C# language. I therefore ended up designing my own pattern for creating immutable objects as described in this question:

Immutable object pattern in C# - what do you think?

Anders Hejlsberg is talking about support for this type of immutability from 36:30 in the following interview:

Expert to Expert: Anders Hejlsberg - The Future of C#