static class

The C# compiler imposes the following restrictions on static classes:

1. Static classes must be directly derived from the base class System.Object. It is meaningless to derive from any other base class. Inheritance only works with objects, and you cannot create instances of static classes

2. A static class cannot implement any interface. This is because the interface method can only be called when it is an instance of the applicable class.

3. Static classes can only define static members (fields, methods, properties and events). Any instance members will cause the compiler to report an error

4. Static classes cannot be used as fields, method parameters or local variables, because they all represent variables that refer to instances, which is not allowed at this time. The compiler will report an error if it detects any such usage

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