[英]Nested Ninject Bindings - Dependency Injection
我有兩個類(具有類似命名的接口):
OuterService(IInnerService innerService)
InnerService(string configurationKey)
在我的NinjectMvc3類中,我具有IInnerService接口的綁定:
kernel.Bind<IInnerService>.ToMethod(c => new InnerService("myConfigurationKey")))
現在,我只是在IOuterService綁定中復制InnerService的構造函數實例:
kernel.Bind<IOuterService>.ToMethod(c => new OuterService(new InnerService("myConfigurationKey")))
有什么方法可以通過使用IInnerService接口進行嵌套/級聯注入來避免第二個InnerService構造函數?
// I realize this isn't valid, but it may better clarify my intent:
kernel.Bind<IOuterService>.ToMethod(c => new OuterService(IInnerService))
我認為普通kernel.Bind<IOuterService>().To<OuterService>()
應該對您來說很好。
我准備了一個小片段來確定是否正是您想要的。 這個對嗎?
using System;
using Ninject;
namespace NinjectTest
{
class Program
{
static void Main(string[] args)
{
IKernel kernel = new StandardKernel();
kernel.Bind<IInnerService>().ToMethod(c=>new InnerService("this is a test config key")); //bind InnerService implementation to be used with provided string
kernel.Bind<IOuterService>().To<OuterService>(); //bind OuterService implementation to be used, all parameters will be injected to it using previously defined configs
var outerService = kernel.Get<IOuterService>();
var result = outerService.CallInner();
Console.WriteLine(result);
Console.ReadLine();
}
public interface IInnerService
{
string GetConfigKey();
}
public class InnerService : IInnerService
{
private readonly string _configurationKey;
public InnerService(string configurationKey)
{
_configurationKey = configurationKey;
}
public string GetConfigKey()
{
return _configurationKey;
}
}
public class OuterService : IOuterService
{
private readonly IInnerService _innerService;
public OuterService(IInnerService innerService)
{
_innerService = innerService;
}
public string CallInner() //purely for testing
{
return _innerService.GetConfigKey();
}
}
public interface IOuterService
{
string CallInner();
}
}
}
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