Should You Use Static Classes in C#?

C#static class: Flag and disadvantages

The static class in C#provides a way to define practical methods. These methods do not associate with specific objects. Microsoft's documentation recommends that the static class is used for organizational purposes and takes the MATH class in System's name space as an example.

However, the static class may be limited in some cases:

Polymorphism:

Static methods cannot be rewritten, which may hinder functional changes or expand through inheritance.

Interface compatibility: Static methods cannot be defined through interface, which limits their use in certain design patterns and make it more difficult to achieve replacement.

Testability: Static methods are not easily replaced by testing, which makes the unit test complicated.

Code organization:

Static classes often become large and include unrelated functions, which leads to the swelling of the code. Parameter dependencies:

Static methods with a large number of optional parameters may become awkward and complex.

Unnecessary instance creation: Although the cost of creating instances for a stateless method is not high, unnecessary expenses will still be introduced in some cases.

Despite these limitations, static classes are still very valuable under certain circumstances: The real utility class:

The static method is very suitable for independent practical program tasks that do not require class status or complex parameter processing, such as numerical conversion (for example, system.convert).

One -time project: In the important scenes of future maintenance and scalability, static methods can simplify code development.

Standardization:

It can be combined with the use of static methods and instance methods to maintain the organizational and consistency of the project. However, establishing a clear guide for it is important.

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