[英]Nested Ninject Bindings - Dependency Injection
I have two classes (with similarly named interfaces): 我有两个类(具有类似命名的接口):
OuterService(IInnerService innerService)
InnerService(string configurationKey)
In my NinjectMvc3 class I have a binding for the IInnerService interface: 在我的NinjectMvc3类中,我具有IInnerService接口的绑定:
kernel.Bind<IInnerService>.ToMethod(c => new InnerService("myConfigurationKey")))
Right now, I am just copying the constructor instantiation for InnerService within the IOuterService binding: 现在,我只是在IOuterService绑定中复制InnerService的构造函数实例:
kernel.Bind<IOuterService>.ToMethod(c => new OuterService(new InnerService("myConfigurationKey")))
Is there any way that I could avoid this second InnerService constructor by doing a nested/cascading injection with the IInnerService interface? 有什么方法可以通过使用IInnerService接口进行嵌套/级联注入来避免第二个InnerService构造函数?
// I realize this isn't valid, but it may better clarify my intent:
kernel.Bind<IOuterService>.ToMethod(c => new OuterService(IInnerService))
I think ordinary kernel.Bind<IOuterService>().To<OuterService>()
should work pretty well for you. 我认为普通kernel.Bind<IOuterService>().To<OuterService>()
应该对您来说很好。
I prepared a small snippet to determine, that if that's really what you want. 我准备了一个小片段来确定是否正是您想要的。 Is this correct? 这个对吗?
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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