Sample desired syntax for declarative definition of bound lifetime scopes.

LifetimeScopeSyntaxSample.cs

// Container context tags
enum EContainerContext
{
     UnitOfWork,
     Plugin,
     MultiInstanceWindow
}

// Registration code for an object that owns a lifetime scope
builder.RegisterType<MyDbContext>()
     .As<DbContext>();

builder.RegisterType<UnitOfWork>() // Has dependency on DbContext.
     .As<IUnitOfWork>()
     .EstablishesLifetimeScope() // Desired syntax. Indicates each new UnitOfWork should have a new lifetime scope bound to the life of the object. Also implies the UnitOfWork itself has per-dependency lifetime scope. Each time requested outside the bound lifetime scope, a new one is created.
     .WithTag(EContainerContext.UnitOfWork); // Desired syntax. Specifies the tag to attach to the generated lifetime scope.

builder.RegisterType<DomainType1Repository>() // Has dependency on IUnitOfWork.
     .As<IRepository<DomainType1>>()
     .InstancePerMatchingLifetimeScope(EContainerContext.UnitOfWork);

builder.RegisterType<DomainType2Repository>() // Has dependency on IUnitOfWork.
     .As<IRepository<DomainType2>>()
     .InstancePerMatchingLifetimeScope(EContainerContext.UnitOfWork);