Unity fails to load generic type definition via xml configuration

问题

I'm running into some problems configuring Unity 3.0 via XML configuration. Resolving the generic type will give me the following exception message:

The type INLog`1 does not have an accessible constructor.

Here's the layout for my logging classes:

namespace Common.Utils.Logging {
    public interface INLog
    {
    }

    public interface INLog<T> : INLog where T : class
    {
    }

    public class NLog : INLog
    {
        public NLog(Type type)
        {
        }
    }

    public class NLog<T> : NLog, INLog<T>
        where T : class
    {
        public NLog()
            : base(typeof(T))
        {
        }
    }
}

I register the generic type with this XML code:

<type type="Common.Utils.Logging.INLog[], Common.Utils" mapTo="Common.Utils.Logging.NLog[], Common.Utils" />

Loading this configuration gives me the following container registration:

LifetimeManager: {Microsoft.Practices.Unity.TransientLifetimeManager}
LifetimeManagerType: {Name = "TransientLifetimeManager" FullName = "Microsoft.Practices.Unity.TransientLifetimeManager"}
MappedToType: {Name = "NLog[]" FullName = "Common.Utils.Logging.NLog[]"}
Name: null
RegisteredType: {Name = "INLog[]" FullName = "Common.Utils.Logging.INLog[]"}

Instead of the registration I'm expecting, namely:

LifetimeManager: null
LifetimeManagerType: {Name = "TransientLifetimeManager" FullName = "Microsoft.Practices.Unity.TransientLifetimeManager"}
MappedToType: {Name = "NLog`1" FullName = "Common.Utils.Logging.NLog`1"}
Name: null
RegisteredType: {Name = "INLog`1" FullName = "Common.Utils.Logging.INLog`1"}

Registering in code works just fine and gives the expected registration:

using (IUnityContainer container = new UnityContainer())
{
    container.RegisterType(typeof(INLog<>), typeof(NLog<>));
}

But I can't manage to get it loaded correctly via the configuration file. I guess this has to to with the inheritance of the non-generic types (I)NLog...

Does anyone of you guys know how to fix this?

Best regards, Rick

回答1:

Try this instead of the [] notation

<type type="Common.Utils.Logging.INLog`1, Common.Utils" mapTo="Common.Utils.Logging.NLog`1, Common.Utils" />

Feels awkward, I know, but it should work.

来源：https://stackoverflow.com/questions/18766650/unity-fails-to-load-generic-type-definition-via-xml-configuration

标签

xml

generics

unity-container