私は、Ninject Factory Extension Bind Multiple Concrete Types To One Interfaceというタイトルの SO の質問で尋ねられたシナリオを拡張しようとしています。実装の規則ベースのバインディングに Ninject 規則を使用しICar
ます。
私は、Akim によって作成された受け入れられた回答と、完全な例を概説する彼の Gistに取り組んでいます。
違いは、明示的なICar
バインディングを規約ベースのバインディングに置き換えたことです (または、少なくともそれを試みました;)。
public class CarModule : NinjectModule
{
public override void Load()
{
Bind<ICarFactory>()
.ToFactory(() => new UseFirstArgumentAsNameInstanceProvider());
// my unsuccessful binding
Kernel.Bind(scanner => scanner
.FromThisAssembly()
.SelectAllClasses()
.InheritedFrom<ICar>()
.BindAllInterfaces());
//Bind<ICar>()
// .To<Mercedes>()
// .Named("Mercedes");
//Bind<ICar>()
// .To<Ferrari>()
// .Named("Ferrari");
}
}
car
テストで変数をインスタンス化しようとすると、次のようになりActivationException
ます。
Ninject.ActivationException was unhandled by user code
Message=Error activating ICar
No matching bindings are available, and the type is not self-bindable.
Activation path:
1) Request for ICar
Suggestions:
1) Ensure that you have defined a binding for ICar.
2) If the binding was defined in a module, ensure that the module has been loaded into the kernel.
3) Ensure you have not accidentally created more than one kernel.
4) If you are using constructor arguments, ensure that the parameter name matches the constructors parameter name.
5) If you are using automatic module loading, ensure the search path and filters are correct.
Source=Ninject
StackTrace:
at Ninject.KernelBase.Resolve(IRequest request) in c:\Projects\Ninject\ninject\src\Ninject\KernelBase.cs:line 362
at Ninject.ResolutionExtensions.GetResolutionIterator(IResolutionRoot root, Type service, Func`2 constraint, IEnumerable`1 parameters, Boolean isOptional, Boolean isUnique) in c:\Projects\Ninject\ninject\src\Ninject\Syntax\ResolutionExtensions.cs:line 263
at Ninject.ResolutionExtensions.Get(IResolutionRoot root, Type service, String name, IParameter[] parameters) in c:\Projects\Ninject\ninject\src\Ninject\Syntax\ResolutionExtensions.cs:line 164
at Ninject.Extensions.Factory.Factory.InstanceResolver.Get(Type type, String name, Func`2 constraint, ConstructorArgument[] constructorArguments, Boolean fallback) in c:\Projects\Ninject\ninject.extensions.factory\src\Ninject.Extensions.Factory\Factory\InstanceResolver.cs:line 75
at Ninject.Extensions.Factory.StandardInstanceProvider.GetInstance(IInstanceResolver instanceResolver, MethodInfo methodInfo, Object[] arguments) in c:\Projects\Ninject\ninject.extensions.factory\src\Ninject.Extensions.Factory\Factory\StandardInstanceProvider.cs:line 78
at Ninject.Extensions.Factory.FactoryInterceptor.Intercept(IInvocation invocation) in c:\Projects\Ninject\ninject.extensions.factory\src\Ninject.Extensions.Factory\Factory\FactoryInterceptor.cs:line 57
at Castle.DynamicProxy.AbstractInvocation.Proceed()
at Castle.Proxies.ICarFactoryProxy.CreateCar(String carType)
at Ninject.Extensions.Conventions.Tests.NinjectFactoryTests.A_Car_Factory_Creates_A_Car_Whose_Type_Name_Equals_Factory_Method_String_Argument() in C:\Programming\Ninject.Extensions.Conventions.Tests\NinjectFactoryTests.cs:line 33
InnerException:
どうすればこのテストに合格できますか?
[Fact]
public void A_Car_Factory_Creates_A_Car_Whose_Type_Name_Equals_Factory_Method_String_Argument()
{
// auto-module loading is picking up my CarModule - otherwise, use:
// using (StandardKernel kernel = new StandardKernel(new CarModule()))
using (StandardKernel kernel = new StandardKernel())
{
// arrange
string carTypeArgument = "Mercedes";
ICarFactory factory = kernel.Get<ICarFactory>();
// act
var car = factory.CreateCar(carTypeArgument);
// assert
Assert.Equal(carTypeArgument, car.GetType().Name);
}
}
元の質問を参照する必要がないように、可能な限り凝縮された残りのコードを次に示します。
public interface ICarFactory { ICar CreateCar(string carType); }
public interface ICar { void Drive(); void Stop(); }
public class Mercedes : ICar {
public void Drive() { /* mercedes drives */ }
public void Stop() { /* mercedes stops */ }
}
public class Ferrari : ICar {
public void Drive() { /* ferrari drives */ }
public void Stop() { /* ferrari stops */ }
}
public class UseFirstArgumentAsNameInstanceProvider : StandardInstanceProvider
{
protected override string GetName(MethodInfo methodInfo, object[] arguments)
{
return (string) arguments[0];
}
protected override ConstructorArgument[] GetConstructorArguments(MethodInfo methodInfo, object[] arguments)
{
return base.GetConstructorArguments(methodInfo, arguments).Skip(1).ToArray();
}
}