Ninject 是否具有我可以用来装饰类或构造函数以让 Ninject 忽略它的属性?
我需要摆脱:
A cyclical dependency was detected between the constructors of two services.
这是我的代码:
// Abstraction
public interface ICommandHandler<TCommand>
{
void Handle(TCommand command);
}
// Implementation
public class ShipOrderCommandHandler
: ICommandHandler<ShipOrderCommand>
{
private readonly IRepository<Order> repository;
public ShipOrderCommandHandler(
IRepository<Order> repository)
{
this.repository = repository;
}
public void Handle(ShipOrderCommand command)
{
// do some useful stuf with the command and repository.
}
}
我的通用装饰器:
public TransactionalCommandHandlerDecorator<TCommand>
: ICommandHandler<TCommand>
{
private ICommandHandler<TCommand> decoratedHandler;
public TransactionalCommandHandlerDecorator(
ICommandHandler<TCommand> decoratedHandler)
{
this.decoratedHandler = decoratedHandler;
}
public void Handle(TCommand command)
{
using (var scope = new TransactionScope())
{
this.decoratedHandler.Handle(command);
scope.Complete();
}
}
}
我的容器注册:
kernel.Bind(typeof(ICommandHandler<>))
.To(typeof(TransactionCommandHandlerDecorator<>));
最佳答案
这是一个基于您的代码的工作示例。
public class AutoDecorationFacts
{
readonly StandardKernel _kernel = new StandardKernel();
public AutoDecorationFacts()
{
_kernel.Bind( typeof( ICommandHandler<> ) )
.To( typeof( TransactionalCommandHandlerDecorator<> ) )
.Named( "decorated" );
}
[Fact]
public void RawBind()
{
_kernel.Bind( typeof( ICommandHandler<> ) ).To<ShipOrderCommandHandler>().WhenAnyAnchestorNamed( "decorated" );
VerifyBoundRight();
}
void VerifyBoundRight()
{
var cmd = _kernel.Get<ICommandHandler<ShipOrderCommand>>();
Assert.IsType<TransactionalCommandHandlerDecorator<ShipOrderCommand>>( cmd );
}
最好与
Ninject.Extensions.Conventions
一起使用:- [Fact]
public void NameSpaceBasedConvention()
{
_kernel.Bind( scan => scan
.FromThisAssembly()
.SelectAllClasses()
.InNamespaceOf<CommandHandlers.ShipOrderCommandHandler>()
.BindAllInterfaces()
.Configure( x => x.WhenAnyAnchestorNamed( "decorated" ) ) );
VerifyBoundRight();
}
[Fact]
public void UnconstrainedWorksTooButDontDoThat()
{
_kernel.Bind( scan => scan
.FromThisAssembly()
.SelectAllClasses()
.BindAllInterfaces( )
.Configure( x=>x.WhenAnyAnchestorNamed("decorated" )));
VerifyBoundRight();
}
}
你的课:
公共(public)类 ShipOrderCommand
{
}
// Abstraction
public interface ICommandHandler<TCommand>
{
void Handle( TCommand command );
}
// Implementation
namespace CommandHandlers
{
public class ShipOrderCommandHandler
: ICommandHandler<ShipOrderCommand>
{
public ShipOrderCommandHandler(
)
{
}
public void Handle( ShipOrderCommand command )
{
// do some useful stuf with the command and repository.
}
}
}
public class TransactionalCommandHandlerDecorator<TCommand>
: ICommandHandler<TCommand>
{
private ICommandHandler<TCommand> decoratedHandler;
public TransactionalCommandHandlerDecorator(
ICommandHandler<TCommand> decoratedHandler )
{
this.decoratedHandler = decoratedHandler;
}
public void Handle( TCommand command )
{
this.decoratedHandler.Handle( command );
}
}
(使用 Ninject 和 Ninject.Extensions.Conventions 的 NuGet 最新版本)
关于.net - 如何指示 Ninject 从其隐式绑定(bind)列表中隐藏类型,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10013262/