如何使用 ninject 工厂,它创建一个带有构造函数参数的实例,而不依赖于参数名称。
问题是ToConstructor()
-Method 不起作用,因为我将它绑定到通用定义。
以下示例有效,如果我使用具有相应构造函数参数名称的工厂方法,但我不喜欢它依赖名称。
因为如果有人选择了错误的名称或重命名派生类中的 ctor-argument,以下解决方案非常脆弱并且会中断。
有什么解决办法吗?
这是示例代码:
[TestFixture]
public class NinjectFactoryBindingsTest
{
[Test]
public void ConstructorSelectionWithArguments()
{
NinjectSettings ninjectSettings = new NinjectSettings();
ninjectSettings.LoadExtensions = false;
using (var kernel = new StandardKernel(ninjectSettings, new FuncModule()))
{
// IDependencyA will be passed to the factory, therefore it is not bounded
//kernel.Bind<IDependencyA>().To<DependencyA>();
kernel.Bind<IDependencyB>().To<DependencyB>();
kernel.Bind(typeof(IGenericBaseClass<>)).To(typeof(GenericDerivedClass<>));
kernel.Bind<IGenericClassFactory>().ToFactory();
IGenericClassFactory factory = kernel.Get<IGenericClassFactory>();
DependencyA dependencyA = new DependencyA();
IGenericBaseClass<GenericImpl> shouldWorkInstance = factory.Create<GenericImpl>(dependencyA);
Assert.NotNull(shouldWorkInstance);
}
}
}
public interface IGenericClassFactory
{
IGenericBaseClass<TGeneric> Create<TGeneric>(IDependencyA someName) where TGeneric : IGeneric;
// This works, but relies on ctor-param-names!!!
// IGenericBaseClass<TGeneric> Create<TGeneric>(IDependencyA otherNameThanInBaseClass) where TGeneric : IGeneric;
}
public class DependencyA : IDependencyA
{
}
public class DependencyB : IDependencyB
{
}
public class GenericDerivedClass<TGeneric> : GenericBaseClass<TGeneric> where TGeneric : IGeneric
{
public GenericDerivedClass(IDependencyA otherNameThanInBaseClass, IDependencyB dependencyB)
: base(otherNameThanInBaseClass, dependencyB)
{
}
}
public abstract class GenericBaseClass<TGeneric> : IGenericBaseClass<TGeneric> where TGeneric : IGeneric
{
protected GenericBaseClass(IDependencyA dependencyA, IDependencyB dependencyB)
{
}
}
public interface IGenericBaseClass<TGeneric> where TGeneric : IGeneric
{
}
public interface IDependencyB
{
}
public interface IDependencyA
{
}
public class GenericImpl : IGeneric
{
}
public interface IGeneric
{
}