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Can static class have state?
Just know how static classes work in the CLR: You can’t control the time when static constructors are called. Static classes have a separate state for each calling program.
Why You Should Avoid static classes?
Classes with static and non-static methods.
- Static methods inside a class are usually a good indication of a method that doesn’t belong to this particular class.
- Static methods are not polymorphic.
- Static methods can’t be used for abstraction and inheritance.
- Static methods are bad for testability.
Why is static methods bad?
The reason you are warned away from static methods is that using them forfeits one of the advantages of objects. Objects are intended for data encapsulation. This prevents unexpected side effects from happening which avoids bugs. Static methods have no encapsulated data* and so don’t garner this benefit.
How do you avoid static class?
Just use them wisely… I think the general argument is against keeping mutable state in static classes, and basically using them as global variables. There’s nothing wrong with static helper methods in a static class.
When should we use a static class?
The advantage of using a static class is that the compiler can check to make sure that no instance members are accidentally added. The compiler will guarantee that instances of this class cannot be created. Static classes are sealed and therefore cannot be inherited. They cannot inherit from any class except Object.
What’s the difference between static classes and non static classes?
Static Classes and Static Class Members (C# Programming Guide) A static class is basically the same as a non-static class, but there is one difference: a static class cannot be instantiated. In other words, you cannot use the new operator to create a variable of the class type.
Can a static class be inherited from another class?
The compiler will guarantee that instances of this class cannot be created. Static classes are sealed and therefore cannot be inherited. They cannot inherit from any class except Object. Static classes cannot contain an instance constructor; however, they can contain a static constructor.
Can a static class contain an instance constructor?
Static classes cannot contain an instance constructor. However, they can contain a static constructor. Non-static classes should also define a static constructor if the class contains static members that require non-trivial initialization. For more information, see Static Constructors.
Why do I need a static utility class?
I used to love utility classes filled up with static methods. They made a great consolidation of helper methods that would otherwise lie around causing redundancy and maintenance hell. They’re very easy to use, no instantiation, no disposal, just fire’n’forget.