C# Can';t解析Web Api控制器中的依赖项
我有一个带有owin和Windsor的Web Api 获取下一个错误: 发生错误。尝试创建“DBManagerController”类型的控制器时出错。确保控制器在System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage请求,HttpControllerDescriptor controllerDescriptor,Type controllerType)处具有无参数公共构造函数.System.InvalidOperationException 在System.Web.Http.Controllers.HttpControllerDescriptor.CreateController上(HttpRequestMessage请求) 在System.Web.Http.Dispatcher.HttpControllerDispatcher.d_u1.MoveNext()处发生错误。键入“Swissphone.SolutionKit.Utilities.DbInit.DataManager.WebHost.Controllers.DBManagerController”在System.Linq.Expressions.Expression.New(Type)处没有默认构造函数System.ArgumentException 在System.Web.Http.Internal.TypeActivator.Create[TBase](类型instanceType)中 位于System.Web.Http.Dispatcher.DefaultHttpControllerActivator.GetInstanceActivator(HttpRequestMessage请求,类型controllerType,Func`1&activator) 在System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage请求,HttpControllerDescriptor controllerDescriptor,类型controllerType) 这很奇怪,因为我注册了所有依赖项 这是我的创业课程:C# Can';t解析Web Api控制器中的依赖项,c#,asp.net,castle-windsor,asp.net-web-api,owin,C#,Asp.net,Castle Windsor,Asp.net Web Api,Owin,我有一个带有owin和Windsor的Web Api 获取下一个错误: 发生错误。尝试创建“DBManagerController”类型的控制器时出错。确保控制器在System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage请求,HttpControllerDescriptor controllerDescriptor,Type controllerType)处具有无参数公共构造函数.Sys
public class Startup
{
public void Configuration(IAppBuilder app)
{
var httpContext = HttpContext.Current;
var hibernateConfigFileName = string.Empty;
if (httpContext != null)
{
hibernateConfigFileName = httpContext.Server.MapPath(Properties.Settings.Default.HibernateConfigFile);
}
else
{
throw new InvalidOperationException("When using IIS hosting, HttpContext.Current must not be NULL");
}
var windsorContainer = new WindsorContainer();
windsorContainer.Install(new ContextInstaller(), new DbInitInstaller());
var configuration = new HttpConfiguration() { DependencyResolver = new WindsorResolver(windsorContainer) };
configuration.Routes.MapHttpRoute("DBManager",
"api/{controller}/{action}/{id}",
new { id = RouteParameter.Optional });
app.UseWebApi(configuration);
}
}
安装者:
public class ContextInstaller : IWindsorInstaller
{
public void Install(IWindsorContainer container, IConfigurationStore store)
{
container.Register(
Component.For<IUserContext>().ImplementedBy<UserContext>(),
Component.For<ITenantContext>().ImplementedBy<TenantContext>());
}
}
public class DbInitInstaller : IDbInitInstaller
{
public void Install(IWindsorContainer container, IConfigurationStore store)
{
container.Register(
Component.For<IDbInitManager>().ImplementedBy<DbInitManager>());
}
}
我在向控制器发出get请求时出错。无法解析IDbInitManager
有人知道这是错误的,为什么注册的依赖项没有得到解决吗?没有,您没有注册所有的依赖项 基本上,发生的情况是您没有在容器中显式注册控制器。Windsor尝试为您解析未注册的具体类型,但由于无法解析(由您的配置中的错误引起),因此返回null。由于IDependencyResolver契约,Web API强制它返回null。由于Windsor返回null,Web API将尝试创建控制器本身,但由于它没有默认构造函数,因此将抛出“确保控制器具有无参数公共构造函数”异常。此异常消息具有误导性,不能解释真正的原因 您可以为控制器添加其他安装程序:
public class ControllersInstallers : IWindsorInstaller
{
public void Install(IWindsorContainer container, IConfigurationStore store)
{
container.Register(Classes.FromThisAssembly()
.BasedOn<IHttpController>()
.LifestylePerWebRequest());
}
}
公共类控制器安装程序:IWindsorInstaller
{
public void安装(IWindsorContainer、IConfigurationStore)
{
container.Register(Classes.fromthissembly())
.BasedOn()
.LifestylePerWebRequest());
}
}
必须从Windsor解析的每个依赖项都必须明确注册
public class DbInitManager : IDbInitManager
{
public DbInitManager()
{}
}
public class ControllersInstallers : IWindsorInstaller
{
public void Install(IWindsorContainer container, IConfigurationStore store)
{
container.Register(Classes.FromThisAssembly()
.BasedOn<IHttpController>()
.LifestylePerWebRequest());
}
}