Code Inspection: Redundant class or interface specification in base types list

Category	Redundancies in Symbol Declarations
ID	`RedundantExtendsListEntry`
EditorConfig	`resharper_redundant_extends_list_entry_highlighting`
Default severity	Warning
Language	C#
Requires SWA	No

If the list of base types in a class declaration contains types that are in an inheritance relationship, JetBrains Rider issues the warning about redundant specification of a type. Since inheritance in C# is transitive, it is enough to specify the type from which your class derives directly.

In the example below, specifying IFoo in the declaration of MyClass is not necessary because MyClass inherits IFoo from its base class BaseClass. Therefore, JetBrains Rider suggests removal of IFoo from the list of base types of MyClass.

            
public class BaseClass : IFoo
{
}

public class MyClass : BaseClass, IFoo
{
}

        

            
public class BaseClass : IFoo
{
}

public class MyClass : BaseClass
{
}

        

Last modified: 17 April 2024