Static holder types should be Static or NotInheritable

Rule CA1052 assumes that a type that contains only static members is not designed to be inherited, because the type does not provide any functionality that can be overridden in a derived type. A type that is not meant to be inherited should be marked with the static modifier in C# to prohibit its use as a base type. Additionally, its default constructor should be removed. In Visual Basic, the class should be converted to a module.

This rule does not fire for abstract classes or classes that have a base class. However, the rule does fire for classes that support an empty interface. In the latest analyzer implementation of this rule, it also encompasses the functionality of rule CA1053.

A non-abstract type contains only static members (other than a possible default constructor) and is not declared with the static or Shared modifier.

By default, this rule only looks at externally visible types, but this is configurable.

To fix a violation of this rule, mark the type as static and remove the default constructor (C#), or convert it to a module (Visual Basic).

You can suppress violations in the following cases:

• The type is designed to be inherited. The absence of the static modifier suggests that the type is useful as a base type.
• The type is used as a type argument. Static types can't be used as type arguments.