Ninject绑定通用接口
这是一个后续行动Generic Interface dependency injection into factoryNinject绑定通用接口
答案是正确的,但我过于简单的代码。因为在界面上使用out参数,所以不能将TOrderRequest作为create方法中的输入参数。并且在界面上使用Out和In时,绑定将不再起作用。
那么你如何将这与Ninject绑定?
using System;
using Ninject;
using System.Collections.Generic;
using System.Linq;
namespace NinjectPlayGround
{
class Program
{
static void Main(string[] args)
{
var kernel = new StandardKernel();
//How to bind this?
kernel.Bind(typeof(ICreateOrders<,>)).To<HorseOrderCreator>();
//kernel.Bind<ICreateOrders<IOrderRequest, IOrderResponse>>().To(typeof(OrderCreator));
kernel.Bind<IOrderCreatorFactory>().To<OrderCreatorFactory>();
var factory = kernel.Get<IOrderCreatorFactory>();
var orderCreator = factory.GetOrderCreator(new OrderRequest());
var create = orderCreator.Create(new OrderRequest());
}
}
public class OrderRequest : IOrderRequest
{
}
public class OrderResponse : IOrderResponse
{
}
public class HorseOrderRequest : IOrderRequest
{
}
public class HorseOrderResponse : IOrderResponse
{
public string HorseName { get; set; }
}
public class HorseOrderCreator : ICreateOrders<HorseOrderRequest, HorseOrderResponse>
{
public HorseOrderResponse Create(HorseOrderRequest orderRequest)
{
return new HorseOrderResponse() { HorseName = "Fred" };
}
}
public class OrderCreator : ICreateOrders<OrderRequest, OrderResponse>
{
public OrderResponse Create(OrderRequest orderRequest)
{
throw new NotImplementedException();
}
}
public class OrderCreatorFactory : IOrderCreatorFactory
{
private readonly IEnumerable<ICreateOrders<IOrderRequest, IOrderResponse>> createOrders;
public OrderCreatorFactory(IEnumerable<ICreateOrders<IOrderRequest, IOrderResponse>> createOrders)
{
this.createOrders = createOrders;
}
public ICreateOrders<IOrderRequest, IOrderResponse> GetOrderCreator(IOrderRequest orderRequest)
{
//Based on orderRequest i find the implementation i need.
}
}
public interface ICreateOrders<TOrderRequest, TOrderResponse> where TOrderRequest : IOrderRequest where TOrderResponse : IOrderResponse
{
TOrderResponse Create(TOrderRequest orderRequest);
}
public interface IOrderCreatorFactory
{
ICreateOrders<IOrderRequest, IOrderResponse> GetOrderCreator(IOrderRequest orderRequest);
}
public interface IOrderRequest
{
}
public interface IOrderResponse
{
}
}
这是我的意见在你前面的问题点“的空实现的创建和this.createOrders.First()somewhate混淆你想达到什么”
反正这里的东西可能符合您需要。它主要依靠CanHandle
方法ICreateOrders
using System;
using Ninject;
using System.Collections.Generic;
using System.Linq;
namespace NinjectPlayGround
{
class Program
{
static void Main(string[] args)
{
var kernel = new StandardKernel();
//How to bind this?
kernel.Bind<ICreateOrders<IOrderRequest, IOrderResponse>>().To(typeof(OrderCreator));
kernel.Bind<ICreateOrders<IOrderRequest, IOrderResponse>>().To(typeof(HorseOrderCreator));
kernel.Bind<IOrderCreatorFactory>().To<OrderCreatorFactory>();
var factory = kernel.Get<IOrderCreatorFactory>();
var orderCreator = factory.GetOrderCreator(new OrderRequest());
var orderResponse = orderCreator.Create(new OrderRequest());
if (!(orderResponse is OrderResponse)) throw new InvalidCastException();
var horseOrderCreator = factory.GetOrderCreator(new HorseOrderRequest());
var horseResponse = horseOrderCreator.Create(new HorseOrderRequest());
if (!(horseResponse is HorseOrderResponse)) throw new InvalidCastException();
Console.WriteLine("All resolutions successfull");
Console.ReadLine();
}
}
public class OrderRequest : IOrderRequest
{
}
public class OrderResponse : IOrderResponse
{
}
public class HorseOrderRequest : IOrderRequest
{
}
public class HorseOrderResponse : IOrderResponse
{
public string HorseName { get; set; }
}
public abstract class BaseOrderCreator<TOrderRequest, TOrderResponse> : ICreateOrders<IOrderRequest, IOrderResponse> where TOrderRequest : IOrderRequest where TOrderResponse : IOrderResponse
{
public bool CanHandle(IOrderRequest request)
{
return request is TOrderRequest;
}
public abstract TOrderResponse SpecificCreate(TOrderRequest orderRequest);
public IOrderResponse Create(IOrderRequest orderRequest)
{
return this.SpecificCreate((TOrderRequest)orderRequest);
}
}
public class HorseOrderCreator : BaseOrderCreator<HorseOrderRequest, HorseOrderResponse>
{
public override HorseOrderResponse SpecificCreate(HorseOrderRequest orderRequest)
{
return new HorseOrderResponse() { HorseName = "Fred" };
}
}
public class OrderCreator : BaseOrderCreator<OrderRequest, OrderResponse>
{
public override OrderResponse SpecificCreate(OrderRequest orderRequest)
{
return new OrderResponse();
}
}
public class OrderCreatorFactory : IOrderCreatorFactory
{
private readonly IEnumerable<ICreateOrders<IOrderRequest, IOrderResponse>> createOrders;
public OrderCreatorFactory(IEnumerable<ICreateOrders<IOrderRequest, IOrderResponse>> createOrders)
{
this.createOrders = createOrders;
}
public ICreateOrders<IOrderRequest, IOrderResponse> GetOrderCreator(IOrderRequest orderRequest)
{
return createOrders.FirstOrDefault(co => co.CanHandle(orderRequest));
}
}
public interface ICreateOrders<in TOrderRequest, out TOrderResponse> where TOrderRequest : IOrderRequest where TOrderResponse : IOrderResponse
{
bool CanHandle(IOrderRequest request);
TOrderResponse Create(TOrderRequest orderRequest);
}
public interface IOrderCreatorFactory
{
ICreateOrders<IOrderRequest, IOrderResponse> GetOrderCreator(IOrderRequest orderRequest);
}
public interface IOrderRequest
{
}
public interface IOrderResponse
{
}
}
由于HorseOrderCreator
是关闭泛型类型,它真的没有意义将其绑定到一个开放通用typeof(ICreateOrders<,>)
。毕竟,HorseOrderCreator
可以从来没有是一个!
另外,不管是什么DI容器,你当前的代码都不会工作。 尝试此:
ICreateOrders<IOrderRequest, IOrderResponse> createOrders =
(ICreateOrders<IOrderRequest, IOrderResponse>)new HorseOrderCreator();
结果:
System.InvalidCastException 无法转换类型 'HorseOrderCreator' 的目的为类型 'ICreateOrders`2 [NinjectPlayGround.IOrderRequest,NinjectPlayGround.IOrderResponse]'。
所以,你的工厂将永远能够返回一个HorseOrderCreator
鉴于目前的接口约束。
所以这是一个设计问题。不是DI问题。而且该设计可能还包括界面的使用者,这些问题中未提供。所以我建议包括它们。
谢谢你的回答。我明白了你的观点,但是当这样做的时候仍然没有注入工厂。 – MacGyver
@MacGyver是的,对不起,相应地更新了我的答案。 – BatteryBackupUnit
辉煌。谢谢@jbl。 – MacGyver