How do I utilize a named instance within the ObjectFactory.Initialize call for StructureMap?

I am trying to do the following bootstrapping:

            x.For(Of IErrorLogger).Use(Of ErrorLogger.SQLErrorLogger)().
                Ctor(Of IErrorLogger)("backupErrorLogger").Is(ObjectFactory.GetNamedInstance(Of IErrorLogger)("Disk"))

            x.For(Of IErrorLogger).Add(
                Function()
                    Return New ErrorLogger.DiskErrorLogger(
                        CreateErrorFileName(ServerMapPath(GetAppSetting("ErrorLogFolder"))))
                End Function).Named("Disk")

But it shows this error:

StructureMap Exception Code: 200 Could not find an Instance named "Disk" for PluginType Logging.IErrorLogger

I sort of understand why this is happening.. the question is, how do I utilize a named instance within the registry? Maybe something like lazy initialization for the ctor argument for the SQLErrorLogger? I am not sure how to make it happen.

Thanks in advance for any help开发者_开发知识库 you can provide.

I found the correct way to do it in the latest version (2.6.1) of StructureMap:

x.For(Of IErrorLogger).Use(Of ErrorLogger.SQLErrorLogger)().
    Ctor(Of IErrorLogger)("backupErrorLogger").Is(
        Function(c) c.ConstructedBy(Function() ObjectFactory.GetNamedInstance(Of IErrorLogger)("Disk"))
        )

x.For(Of IErrorLogger).Add(Function() _
        New ErrorLogger.DiskErrorLogger(
            CreateErrorFileName(ServerMapPath(GetAppSetting("ErrorLogFolder"))))
        ).Named("Disk")

Notice for the Is method of Ctor, we need to provide a func(IContext), and use the IContext.ConstructedBy(Func()) to call ObjectFactory.Get... to successfully register the IErrorLogger in this case.

This is the only way to do it as far as I know. The other Icontext methods such as IsThis and Instance will only work with already registered type.

Your problem is that you are trying to access the Container before it's configured. In order to make structuremap evaluate the object resolution after the configuration you need to provide a lambda to the Is function. The lambda will be evaluated when trying to resolve the type registered.

x.[For](Of ILogger)().Add(Of SqlLogger)().Ctor(Of ILogger)("backupErrorLogger")_
    .[Is](Function(context) context.GetInstance(Of ILogger)("Disk"))
x.[For](Of ILogger)().Add(Of DiskLogger)().Ctor(Of String)("errorFileName")_
    .[Is](CreateErrorFileName(ServerMapPath(GetAppSetting("ErrorLogFolder"))))_
    .Named("Disk")

Disclaimer: I'm not completely up-to-date with the lambda syntax in VB.NET, but I hope I got it right.

Edit:

The working C# version of this I tried myself before posting was this:

ObjectFactory.Initialize(i =>
            {
                i.For<ILogger>().Add<SqlLogger>()
                    .Ctor<ILogger>("backup").Is(
                        c => c.GetInstance<ILogger>("disk"))
                    .Named("sql");
                i.For<ILogger>().Add<DiskLogger>().Named("disk");
            });

var logger = ObjectFactory.GetNamedInstance<ILogger>("sql");