Code Inspection: Class is never instantiated (non-private accessibility)

tip

You can suppress this inspection to ignore specific issues, change its severity level to make the issues less or more noticeable, or disable it altogether.

JetBrains Rider determines if no objects of a class were created in a project — in fact, if no direct instances or usages of the class were found. If the class only contains static members (and/or constant fields), JetBrains Rider suggests making the class static. In other cases JetBrains Rider suggests making the class abstract, if possible.

For the solution-wide inspection to work, you need to enable at least one of the following:

• Simplified global usage checking: select Show unused non-private type members when solution-wide analysis is off on the Editor | Inspection Settings page of JetBrains Rider settings CtrlAlt0S.

• Solution-wide analysis: select Enable solution-wide analysis on the Editor | Inspection Settings page of JetBrains Rider settings CtrlAlt0S.

Note that even if the reported symbol has no direct usages in your solution, there could be cases where it is used indirectly — for example, via reflection — or it could just be designed as public API. In all those cases you would want to suppress the usage-checking inspection for the symbol in one of the following ways:

• The recommended way is to decorate the implicitly used symbol with a code annotation attribute. There are two attributes for this purpose: [UsedImplicitly] and [PublicAPI], which are functionally similar, but let you and your teammates understand how the symbol is actually used.

• You can also suppress usage-checking inspections with any custom attribute. To do so, mark the definition of that attribute with the [MeansImplicitUse] attribute.

• And finally, you can suppress a specific usage-checking inspection as any other code inspection with a suppression comment or a suppression attribute.