`Static readonly` vs. `const` in C#: When Should I Use Which?

C# in the comparison of and static readonly: When will it be used? const

When defining the constant value in C# class,

field or

variables are usually used. However, the two have their own meaning and use cases. static readonly const Public static reading only fields (

)

public static readonly Fields are usually used to maintain unchanged in the entire application and access to it from any location. They are initialized during the loading period and cannot be modified afterwards.

Internal/Protection/Private Normal Value (

) public static readonly

In contrast, Variables are usually used in the internal implementation of details or unintentional values. The compiler optimizes it and is directly embedded in the call site, which may improve performance. const Suggestions: For public constant use of static reading,

const For the constant value that needs to be disclosed and does not change over time, it is usually recommended to use the

field. This ensures their accessibility and abide by the principles of packaging.

The use of attributes

Consider the use of the attributes of only static readonly accessors, not directly accessing fields. This provides additional control of values, allowing potential conversion or verification before returning values.

The limitations of

There are some limitations: get

They must initialize with constant expressions. const Change the value to re -build all client assemblies.

If the value is obtained during runtime, or the method it avoided is connected by the JIT compiler, then it may be low.

const

Conclusion

Fields are suitable for public constants, and
• Variables are more suitable for internal implementation details that do not change with time. Attributes provide greater flexibility and control, but excessive use may lead to unnecessary indirect addressing. In the end, the best choice depends on the specific context and needs of the application. const

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