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    copied!<p>The trick is to make sure every single profile as at least a rule defined in it. If you don't specify a rule (configA) it won't create/see the profile.</p> <p>Given these classes:</p> <pre><code>public interface IFoo { string SayHello(); } public class Foo : IFoo { public string SayHello() { return "Hello"; } } public class SpecialFoo : IFoo { public string SayHello() { return "Hello Special"; } } public interface IBar { } public class Bar : IBar { } public interface IDummy { } public class Dummy : IDummy{ } </code></pre> <p>You can define this registry:</p> <pre><code>public class MyRegistry : Registry { protected override void configure() { ForRequestedType&lt;IBar&gt;().TheDefault.Is.OfConcreteType&lt;Bar&gt;(); ForRequestedType&lt;IFoo&gt;().TheDefault.Is.OfConcreteType&lt;Foo&gt;(); CreateProfileNotEmpty("configA"); CreateProfileNotEmpty("configB") .For&lt;IFoo&gt;().UseConcreteType&lt;SpecialFoo&gt;(); } StructureMap.Configuration.DSL.Expressions.ProfileExpression CreateProfileNotEmpty(string profile) { return CreateProfile(profile) .For&lt;IDummy&gt;().UseConcreteType&lt;Dummy&gt;(); } } </code></pre> <p>And it will work with these tests:</p> <pre><code>[TestMethod] public void TestMethod1() { var container = new Container(new MyRegistry()); Assert.IsNotNull(container.GetInstance&lt;IBar&gt;()); Assert.AreEqual("Hello", container.GetInstance&lt;IFoo&gt;().SayHello()); container.SetDefaultsToProfile("configB"); Assert.IsNotNull(container.GetInstance&lt;IBar&gt;()); Assert.AreEqual("Hello Special", container.GetInstance&lt;IFoo&gt;().SayHello()); container.SetDefaultsToProfile("configA"); Assert.IsNotNull(container.GetInstance&lt;IBar&gt;()); Assert.AreEqual("Hello", container.GetInstance&lt;IFoo&gt;().SayHello()); } </code></pre> <p>if you replace CreateProfileNotEmpty with simple CreateProfile, it will fail on the line that sets the default to configA.</p>
 

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