# IT:AD:StructureMap:HowTo:Register Instances against Open Contracts #



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<panel title="Summary">

Got to admit that a feature like this does make you question why I use [[IT/AD/Unity/]] so often...


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## Process ##

<sxh csharp>
  //Notice how it's an open type:
  Type closingType = typeof(IUnitTestDbContextSeeder<>);

  ObjectFactory
    .Initialize(config => config.Scan(scanner =>
      {
        scanner.Assembly(GetType().Assembly);//this assembly only... 
        scanner.IncludeNamespaceContainingType<DefaultStudentSeeder>();//this ns only... 
        scanner
          //register types implementing open contract as singletons:
          .ConnectImplementationsToTypesClosing(closingType) //<-- NEAT!
          .OnAddedPluginTypes(expression => expression.Singleton()); //as singletons
    }
  ));
</sxh>



## Resources ##