Using Read-only versus const

There are Two difference versions of constants in C#: the Const keyword is used for compile –time constants read only keyword is used for runtime constants. The main issue with const is that it's evaluated at compile-time, which means if it's changed at a later date; you have to not only recompile that application, but all applications that reference that application. In contrast, read -only is evaluated at run-time providing you a lot more flexibility.

An overview of differences between const and read-only in c#

    

Const

Read only

Cont be static

Can be either instance-level or static

Value is evaluated at compile time

The value is evaluated at run time.

It is initialized at declaration only

It can be initialized in declaration or by code in the code constructor .therefore read only fields have difference values depending on constructor used.


 

So, const should really only be used for logical, real-world constants such as days of week, numeric Constants, etc. as for as performance goes, you actively loose the a little performance using read only, but you make up for it for it in flexibility of your application.

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