CA1812: Avoid uninstantiated internal classes
An instance of an assembly-level type is not created by code in the assembly.
This rule tries to locate a call to one of the constructors of the type, and reports a violation if no call is found.
The following types are not examined by this rule:
Compiler-emitted array types
Types that cannot be instantiated and that define static (Shared in Visual Basic) methods only.
If you apply System.Runtime.CompilerServices.InternalsVisibleToAttribute to the assembly that is being analyzed, this rule will not occur on any constructors that are marked as internal because you cannot tell whether a field is being used by another friend assembly.
Even though you cannot work around this limitation in Visual Studio Code Analysis, the external stand-alone FxCop will occur on internal constructors if every friend assembly is present in the analysis.
To fix a violation of this rule, remove the type or add the code that uses it. If the type contains only static methods, add one of the following to the type to prevent the compiler from emitting a default public instance constructor:
A private constructor for types that target .NET Framework versions 1.0 and 1.1.
The static (Shared in Visual Basic) modifier for types that target .NET Framework 2.0.
It is safe to suppress a warning from this rule. We recommend that you suppress this warning in the following situations:
The class is created through late-bound reflection methods such as T:System.Activator.CreateInstance.
The class is passed as a generic type parameter that has a new constraint. For example, the following example will raise this rule.
In these situations, we recommended you suppress this warning.