Examples of Immutable Types in .Net

Question

We know the concept of immutability but need to know few immutable types other than

• String
• DateTime

Are there more?

Answer 1

TimeSpan, or modern type family Tuple. Tuple is immutable cause it implemented to support functional languages (F# f.e.) in .NET.

Of course you can make your own classes and structures mutable or immutable, as you wish. Immutable types (aka value objects) are useful in multithreading programming, functional programming, to clear a code.

To make a class or struct immutable just remove all public/protected/internal setters; and better declare all fields with readonly keyword.