Tell StructureMap to use a specific constructor

Question

I have two services that require an XPathDocument. I want to be able to define named instances of XPathDocumnet to use in the configuration of the two services. I also want to be able to tell StuctureMap which constructor of XPathDocument to use. When I try to get an instance of XPathDocument it tells me that it can't find the plugged type for XmlReader. I want to use the constructor that requires a string uri for the xml file. I cannot seem to get this to work. Here is the StructureMap configuration code.

public class Service1 : IService1 {     public Service1(XPathDocument document) {} } public class Service2 : IService2 {     public Service2(XPathDocument document) {} }  public class Registry1 : Registry {     ForRequestedType<IService1>().TheDefault.Is.OfConcreteType<Service1>()         .CtorDependency<XPathDocument>()         .Is(x => x.TheInstanceNamed("XPathDocument1"));     ForRequestedType<IService2>().TheDefault.Is.OfConcreteType<Service2>()         .CtorDependency<XPathDocument>()         .Is(x => x.TheInstanceNamed("XPathDocument2"));      ForRequestedType<XPathDocument>().AddInstances(x => {         x.OfConcreteType<XPathDocument>()             .WithCtorArg("uri").EqualToAppSetting("XmlFile1")             .WithName("XPathDocument1");         x.OfConcreteType<XPathDocument>()             .WithCtorArg("uri").EqualToAppSetting("XmlFile2")             .WithName("XPathDocument2");     }); } 

Answer 1

Look at this. In short, you need to change OfConcreteType<Service1>() to ConstructedBy(() => new Service1());.