如何使用 Autofac 注册 NodaTime.ZonedClock

Question

It is possible to register NodaTime.SystemClock like this: builder.Register(_ => SystemClock.Instance).As<IClock>().SingleInstance(); , according to Pac0's comment here .

How do I do the same for NodaTime.ZonedClock ?

Answer 1

ZonedClock doesn't seem to have any singleton accessor like SystemClock does, so you have to call it's constructor. Using the same approach you used for SystemClock , it would look something like this:

builder
    .Register(_ => new ZonedClock(SystemClock.Instance, DateTimeZone.Utc, CalendarSystem.Gregorian))
    .As<IClock>()
    .SingleInstance();

You can adapt the parameters as you see fit (I added DateTimeZone.Utc and CalendarSystem.Gregorian as examples).

Keep in mind that, since both implement the same interface ( IClock ) you can't register both at the same time without using keyed registrations or something similar. If you just want to use the ZonedClock however, this should not be a problem.