protected THandler GetSingleton(InjectContext c)
{
var newContext = new InjectContext(
c.Container, typeof(THandler), null, false, c.ObjectType,
c.ObjectInstance, c.MemberName, c.ParentContext, c.ConcreteIdentifier,
null, c.SourceType);
return((THandler)_singletonProvider.GetInstance(newContext));
}