IComponentTOperation - интерфейс

public interface IComponent<in TOperation> : IComponent
where TOperation : class, IOperationVisitor

Public Interface IComponent(Of In TOperation As {Class, IOperationVisitor})
	Inherits IComponent

generic<typename TOperation>
where TOperation : ref class, IOperationVisitor
public interface class IComponent : IComponent

type IComponent<'TOperation when 'TOperation : not struct and IOperationVisitor> =  
    interface
        interface IComponent
    end