As Dave says,
const values are constants, and only primitive types can be expressed as a constant literal at compile time.
However, there is
readonly which is the
struct /
class equivelant - a value that can only be set in an instance constructor or as part of the declaration:
readonly keyword - C# Reference | Microsoft Docs[
^]
However, a
readonly reference type is not immutable (unlike a
const or a
readonly struct which is). The reference variable can't be changed, but the values in the reference object instance can.
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