Question

I m adding autofac to an existing project and some of the service implementations require their Initialize method to be called and passed configuration information. Currently I m using the code:

builder.Register(context =>
                 {
                    var service = 
                         new SqlTaxRateProvider(context.Resolve<IUserProvider>());
                    service.Initialize(config);
                    return service;
                 }
).As<ITaxService>()
.SingleInstance();

which works but I m still creating the object myself which is what I m trying to get away from this and allow autofac to handle it for me. Is it possible to configure a post create operation that would carry out the custom initialisation?

To give you an idea of what I m after ideally this would be the code:

builder.RegisterType<SqlTaxRateProvider>()
 .As<ITaxService>()
 .OnCreated(service=> service.Initialize(config))
 .SingleInstance();

Update: I am using Autofac-2.1.10.754-NET35

Answer 1

.OnActivating(e => e.Instance.Initialize(...))

should do the trick.

You might also investigate the Startable module (see the Startable entry in the Autofac wiki).

Mark s suggestion to do initialisation in the constructor is also a good one. In that case use

.WithParameter(new NamedParameter("config", config))

to merge the config parameter in with the other constructor dependencies.

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