HostOperationT - класс

public abstract class HostOperation<T> : IHostOperation<T>, 
	IDisposable
where T : IHostOperationContext

Public MustInherit Class HostOperation(Of T As IHostOperationContext)
	Implements IHostOperation(Of T), IDisposable

generic<typename T>
where T : IHostOperationContext
public ref class HostOperation abstract : IHostOperation<T>, 
	IDisposable

[<AbstractClassAttribute>]
type HostOperation<'T when 'T : IHostOperationContext> =  
    class
        interface IHostOperation<'T>
        interface IDisposable
    end