Unity IOC container and how to resolve different instances of the same interface

问题:

I have a unity container that I am registering types within like so:

    IUnityContainer container = new UnityContainer() .RegisterType( "PopulationRate" ) .RegisterType( "BusinessLicenseRate" ); 

Then I also want to register 2 different services that take a ITaxAuthorityRateService variable in their constructor. Both services need a different class that derives from ITaxAuthorityRateService. How can I handle that situation?

回答1:

Ok I figured it out. Keeping the names the same during registration is correct ("PopulationRate" and "BusinessLicenseRate"). All I had to do was add an attribute to the ITaxAuthorityRateService parameter within the constructor of each service like so:

Service1 constructor parameter:

[Dependency( "BusinessLicenseRate" )] ITaxAuthorityRateService rateService 

Service2 constructor parameter:

[Dependency( "PopulationRate" )] ITaxAuthorityRateService rateService 

And then each service received the correct ITaxAuthorityRateService instance.

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