StructureMap, different implementation for different user

Question

We are currently using StructureMap as the IoC container. All was working ok, but now we need to change the defaults in runtime.

What we need is ability to provide IEntityRepository, IEntityService based on a user. Having EntityRepositoryEur, EntityRepositoryRus...

Is there some way how to chnage Instances in runtime based on user setting? What is the best way to do that? Maybe is there some better IoC right now to do that?

Tomas00 · Accepted Answer · 2012-11-24 14:46:57Z

1

I am not familiar with StructureMap but with Unity Application Block (called usually just Unity) you can register more concrete types (services) with single interface. You assign names to these services and at the time of resolution you receive the list of registered services. Then you can choose one based on the user settings.

This is example how to register named services using config file

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration" />
  </configSections>
  <unity>
    <containers>
      <container>
        <types>
          <type name="OutputService1" type="InterfacesLibrary.IOutputService, InterfacesLibrary" mapTo="InputOutputLibrary.ConsoleOutputService, InputOutputLibrary" />
          <type name="OutputService2" type="InterfacesLibrary.IOutputService, InterfacesLibrary" mapTo="InputOutputLibrary.MsgBoxOutputService, InputOutputLibrary" />
        </types>
      </container>
   </containers>
  </unity>
</configuration>

Or you can do the same thing from code

container.RegisterType<IOutputService, ConsoleOutputService>("OutputService1");
container.RegisterType<IOutputService, MsgBoxOutputService>("OutputService2");

At the time of resolution you resolve one or the other type based on user's requirements

    IOutputService outputService;
    if (user.LikesConsole == true)
      outputService = container.Resolve<IOutputService>("OutputService1");
    else
      outputService = container.Resolve<IOutputService>("OutputService2");

Have a look at the series of videos on PRISM. The second video is introduction to Unity.

edited Nov 24, 2012 at 14:46

answered Nov 23, 2012 at 21:06

Tomas00

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2 Comments

Vlad Over a year ago

Please, give a clue, small example. If I wil understand your suggestion, I will learn more about it

Tomas00 Over a year ago

I added the example to my answer above.

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