How can I make a class both implement an Interface and inherit from another class

Question

I want my class to implement an interface and also get the additional properties from Auditable table. Can I do both? I have tried to do it here but I am getting an error in my IDE.

public partial class ObjectiveDetail : IEquatable<ObjectiveDetail>, AuditableTable
{
    ...
}

public abstract class AuditableTable : IAuditableTable
{
    ...
}

Answer 1

You must change

public partial class ObjectiveDetail : IEquatable<ObjectiveDetail>,  AuditableTable

to

public partial class ObjectiveDetail :   AuditableTable, IEquatable<ObjectiveDetail>

In C#, you can inherit one class and implement multiple interfaces and you must put class first.

Answer 2

public SubClass : BaseClass, IInterface

Answer 3

Yes you can do both, but you have to put the base class first:

public partial class ObjectiveDetail : AuditableTable, IEquatable<ObjectiveDetail>

Answer 4

Base class first and then Interface, should work

Answer 5

Nothing prevents you from both implementing an interface and inheriting from a class in the same class, C# only doesn't support multiple inheritance (inheriting from multiple diferent classes) so you don't need to do anything, it should just work.