我的WebApi服务在使用运行时Unity配置时有效,但当我将其更改为使用web.config中的unity配置时,我收到错误
"尝试创建类型的控制器时发生错误 '&myController的#39 ;.确保控制器具有无参数 公共构造函数。"
我使用Unity和Unity.WebApi nuget包。
使用运行时配置(工作正常)时,我的RegisterComponents
方法看起来像这样;
public static void RegisterComponents()
{
IUnityContainer container = new UnityContainer();
container.RegisterType<Repository.Interfaces.IRepository, DataAccess.OracleRepository>(new HierarchicalLifetimeManager());
GlobalConfiguration.Configuration.DependencyResolver = new UnityDependencyResolver(container);
}
在web.config中使用xml配置时,我使用它;
public static void RegisterComponents()
{
IUnityContainer container = new UnityContainer().LoadConfiguration();
GlobalConfiguration.Configuration.DependencyResolver = new UnityDependencyResolver(container);
}
我在web.config中的unity部分看起来像这样;
<unity xmlns="http://schemas.microsoft.com/practices/2010/unity">
<alias alias="IRepository" type="Repository.Interfaces.IRepository, Repository"/>
<alias alias="OracleRepository" type="DataAccess.OracleRepository, DataAccess"/>
<container>
<register type="IRepository" mapTo="OracleRepository" name="oracle">
<lifetime type="hierarchical"/>
</register>
</container>
</unity>
然而,此时,当我转到网址时,应用程序会给出错误;
<Error>
<Message>An error has occurred.</Message>
<ExceptionMessage>An error occurred when trying to create a controller of type 'MyController'. Make sure that the controller has a parameterless public constructor.</ExceptionMessage>
<ExceptionType>System.InvalidOperationException</ExceptionType>
<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.<SendAsync>d__1.MoveNext()</StackTrace>
<InnerException>
<Message>An error has occurred.</Message>
<ExceptionMessage>Resolution of the dependency failed, type = "GatewayService.Controllers.MyController", name = "(none)". Exception occurred while: while resolving. Exception is: InvalidOperationException - The current type, Repository.Interfaces.IRepository, is an interface and cannot be constructed. Are you missing a type mapping? ----------------------------------------------- At the time of the exception, the container was: Resolving GatewayService.Controllers.MyController,(none) Resolving parameter "respository" of constructor GatewayService.Controllers.MyController(Repository.Interfaces.IRepository respository) Resolving Repository.Interfaces.IRepository,(none)</ExceptionMessage>
<ExceptionType>Microsoft.Practices.Unity.ResolutionFailedException</ExceptionType>
...
答案 0 :(得分:0)
引用官方文档,
<register>
元素是任何元素的基本构建块 配置文件。它使您可以指定类型映射和 一种类型的注射配置。 如果指定名称,则为该名称 用于类型映射。如果您未指定名称,则会创建 指定类型的默认映射。您可以指定 每个映射的生命周期管理器如果没有明确的终身经理 为类型配置,它使用瞬态生命周期管理器。
所以我建议从web配置中的register标签中删除name属性。