统一的IoC不依赖注入到网页API控制器 [英] Unity IoC does not inject dependency into Web API Controller
问题描述
我很新的使用Unity，但我的问题是，每当我打电话给我的web服务，我得到一个异常说明
确保控制器具有一个无参数的公共构造
我已经按照多个教程和我仍然得到同样的问题。
在我WebApiConfig类的注册功能，我有
VAR集装箱=新UnityContainer（）;
container.RegisterType＆所述; IValidator，验证＆GT;（新HierarchicalLifetimeManager（））;
config.DependencyResolver =新UnityResolver（容器）;
下面是我UnityResolver类
使用Microsoft.Practices.Unity;
使用系统;
使用System.Collections.Generic;
使用System.Web.Http.Dependencies;公共类UnityResolver：的IDependencyResolver
{
保护IUnityContainer容器; 公共UnityResolver（IUnityContainer容器）
{
如果（集装箱== NULL）
{
抛出新的ArgumentNullException（容器）;
}
this.container =容器;
} 公共对象GetService的（类型的serviceType）
{
尝试
{
返回container.Resolve（的serviceType）;
}
赶上（ResolutionFailedException）
{
返回null;
}
} 公共IEnumerable的＆LT;对象＆gt; GetServices（类型的serviceType）
{
尝试
{
返回container.ResolveAll（的serviceType）;
}
赶上（ResolutionFailedException）
{
返回新的List＆LT;对象＆gt;（）;
}
} 公共IDependencyScope BeginScope（）
{
VAR孩子= container.CreateChildContainer（）;
返回新UnityResolver（小孩）;
} 公共无效的Dispose（）
{
container.Dispose（）;
}
}
我尚未注册任何控制器，因为我并不需要每天都这样教程索赔。这是我的实际控制人。
公共类控制器：ApiController
{
私人IValidator _validator; 公共控制器（IValidator验证）
{
this._validator =验证;
} [HttpPost]
公共无效ReceiveIPN（）
{ }
}
有没有人有任何想法，我可以做错了什么？谢谢！
编辑1：这里是Validator类的执行。这是pretty空的，因为我不想在这里介绍一个bug，直到我解决了统一的问题。
使用系统;
使用System.Collections.Generic;
使用System.Linq的;
使用的System.Web;
公共类验证：IValidator
{
公共BOOL ValidateIPN（字符串体）
{
抛出新NotImplementedException（）;
}
}
编辑2：这里是整个错误响应，我得到当我尝试调用使用招网络API路线
{消息：发生错误，exceptionMessage：错误
试图创建类型的控制器控制器时发生。使
确保该控制器具有一个无参数的公共
构造，exceptionType。：System.InvalidOperationException，堆栈跟踪：
在
System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create（HTT prequestMessage
要求，HttpControllerDescriptor controllerDescriptor，类型
controllerType）在
System.Web.Http.Controllers.HttpControllerDescriptor.CreateController（HTT prequestMessage
请求）的
System.Web.Http.Dispatcher.HttpControllerDispatcher.d__1.MoveNext（），的InnerException：{消息：一个
发生错误，exceptionMessage：类型Project.Controller
不具有默认
构造函数，exceptionType：System.ArgumentException，堆栈跟踪：
在System.Linq.Ex pressions.Ex pression.New（类型类型）在
System.Web.Http.Internal.TypeActivator.Create [TBASE]（类型
instanceType）在
System.Web.Http.Dispatcher.DefaultHttpControllerActivator.GetInstanceOrActivator（HTT prequestMessage
要求，类型controllerType，Func`1＆安培;激活剂）在
System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create（HTT prequestMessage
要求，HttpControllerDescriptor controllerDescriptor，类型
controllerType）}}解决方案所以，敲我的头撞墙了几个小时之后，我发现这是不工作，因为我有一个OWIN /武士刀Startup.cs类在我的项目。现在，我不知道到底发生了什么在这里，所以任何更多的信息将是巨大的。
基本上，因为我是用OWIN /武士刀，我有创建了一个新HttpConfiguration对象，并配置它Startup.cs文件，类似于它是如何在WebApiConfig.cs类完成。
私人无效ConfigureWebApi（HttpConfiguration配置）
{
config.MapHttpAttributeRoutes（）;
VAR集装箱=新UnityContainer（）;
container.RegisterType＆LT; IValidator，验证＆GT;（）;
config.DependencyResolver =新UnityDependencyResolver（容器）; VAR jsonFormatter = config.Formatters.OfType＆LT; JsonMediaTypeFormatter（）第一（）;
jsonFormatter.SerializerSettings.ContractResolver =新CamelCasePropertyNamesContractResolver（）;
}它看起来像code首先通过WebApiConfig的注册函数运行，然后将覆盖HttpConfiguration对象，在Startup.cs文件生成的之一。我在这里将我的容器设置的东西，以便为它工作。
对不起，我没有之前弹出OWIN东西。这是相当新的给我，我不知道这是相关的。希望这样可以节省别人说我刚刚经历过的痛苦。
I'm very new to using Unity, but my problem is that whenever I call my web service, I get an exception stating that
"Make sure that the controller has a parameterless public constructor"
I've followed multiple tutorials and I still get the same issue.
In the Register function of my WebApiConfig class, I have
var container = new UnityContainer(); container.RegisterType<IValidator, Validator>(new HierarchicalLifetimeManager()); config.DependencyResolver = new UnityResolver(container);Here is my UnityResolver class
using Microsoft.Practices.Unity; using System; using System.Collections.Generic; using System.Web.Http.Dependencies; public class UnityResolver : IDependencyResolver { protected IUnityContainer container; public UnityResolver(IUnityContainer container) { if (container == null) { throw new ArgumentNullException("container"); } this.container = container; } public object GetService(Type serviceType) { try { return container.Resolve(serviceType); } catch (ResolutionFailedException) { return null; } } public IEnumerable<object> GetServices(Type serviceType) { try { return container.ResolveAll(serviceType); } catch (ResolutionFailedException) { return new List<object>(); } } public IDependencyScope BeginScope() { var child = container.CreateChildContainer(); return new UnityResolver(child); } public void Dispose() { container.Dispose(); } }I have not registered any controllers, as every tutorial claims that I don't need to do this. Here is my actual controller
public class Controller: ApiController { private IValidator _validator; public Controller(IValidator validator) { this._validator = validator; } [HttpPost] public void ReceiveIPN() { } }Does anyone have any ideas as to what I can be doing wrong? Thanks!
EDIT 1: Here is the "implementation" of the Validator class. It's pretty empty, because I didn't want to introduce a bug here until I resolved the Unity issue.
using System; using System.Collections.Generic; using System.Linq; using System.Web; public class Validator: IValidator { public bool ValidateIPN(string body) { throw new NotImplementedException(); } }EDIT 2: Here is the entire error response I get when I attempt to call the web api route using Fiddler
{"message":"An error has occurred.","exceptionMessage":"An error occurred when trying to create a controller of type 'Controller'. Make sure that the controller has a parameterless public constructor.","exceptionType":"System.InvalidOperationException","stackTrace":" at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType) at System.Web.Http.Controllers.HttpControllerDescriptor.CreateController(HttpRequestMessage request) at System.Web.Http.Dispatcher.HttpControllerDispatcher.d__1.MoveNext()","innerException":{"message":"An error has occurred.","exceptionMessage":"Type 'Project.Controller' does not have a default constructor","exceptionType":"System.ArgumentException","stackTrace":" at System.Linq.Expressions.Expression.New(Type type) at System.Web.Http.Internal.TypeActivator.Create[TBase](Type instanceType) at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.GetInstanceOrActivator(HttpRequestMessage request, Type controllerType, Func`1& activator) at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)"}}
解决方案So, after hours of banging my head against a wall, I've found that this wasn't working because I had an OWIN/Katana Startup.cs class in my project. Now I don't know exactly what's going on here, so any more information would be great.
Basically, since I was using OWIN/Katana, I had a Startup.cs file that created a new HttpConfiguration object and configured it, similar to how it's done in the WebApiConfig.cs class.
private void ConfigureWebApi(HttpConfiguration config) { config.MapHttpAttributeRoutes(); var container = new UnityContainer(); container.RegisterType<IValidator, Validator>(); config.DependencyResolver = new UnityDependencyResolver(container); var jsonFormatter = config.Formatters.OfType<JsonMediaTypeFormatter().First(); jsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver(); }It looks like the code first runs through the WebApiConfig's Register function, and THEN overrides that HttpConfiguration object with the one generated in the Startup.cs file. I had to move my container setup stuff here in order for it to work.
Sorry that I didn't bring up the OWIN stuff before. This is fairly new to me and I didn't realize it was relevant. Hopefully this saves someone else the pain that I've just been through.
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