Const vs. Readonly in C#: When Should You Use Each?

The comparison of Const and Readonly in C#: In -depth understanding

In C#,

and

are used to define constant and read only, but there are significant differences between them. The following is the key difference: const Declaration method: readonly

: It must be assigned during the statement.

: It can be assigned later, but it must be assigned before the constructor is executed.

• const Storage position:
• readonly
: Value is used as a literally stored in the memory during compilation.

: The value is stored in the memory.

Static characteristics:

• const
: The hidden type is static (not the instance -specific).
• readonly : It can be static or instance -specific.

Access method:

: Use
• grammar reference. const
: Use the example variable name reference.
• readonly
Effect on the associated assembly:

: embedded in the IL code of the reference assembly. Constant changes need to be re -compiled and referenced assembly.

: Reserved as a reference to the memory location. The change of the value will be spread to the reference assembly without re -compilation.
• const ClassName.ConstantName When to use:
• readonly
: Values ​​are known and not changed during compilation, such as conversion factor or known constant.

: For the value that may be changed or needs dynamic initialization at runtime, such as configuration settings or object references.

Example:

• const Consider the following code:
• readonly In this example,
is a compilation constant, embedded in IL code, and

initialize during runtime, and can be updated later. If you change the in the future, you can reorganize the

assembly need to be re -compiled, but the reference The assembly will automatically obtain the updated value.

By understanding these differences, you can effectively use

and
• in the C# code to properly define constant and read only. const

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