sitecore - 升级到 sitecore 8 后，WEB API 调用出现 500 错误

Question

最近，我们从 Sitecore 7.5 升级到了 Sitecore 8.0。升级后，自定义 Web API 调用开始返回 500 个错误代码，但存在以下异常:

Message:"An error has occurred."
ExceptionMessage:"ValueFactory attempted to access the Value property of this instance."
ExceptionType:"System.InvalidOperationException"
StackTrace:"   at System.Lazy`1.CreateValue()
   at System.Lazy`1.LazyInitValue()
   at System.Web.Http.Dispatcher.DefaultHttpControllerSelector.GetControllerMapping()
   at System.Web.Http.Routing.AttributeRoutingMapper.AddRouteEntries(SubRouteCollection collector, HttpConfiguration configuration, IInlineConstraintResolver constraintResolver, IDirectRouteProvider directRouteProvider)
   at System.Web.Http.Routing.AttributeRoutingMapper.<>c__DisplayClass2.<>c__DisplayClass4.<MapAttributeRoutes>b__1()
   at System.Web.Http.Routing.RouteCollectionRoute.EnsureInitialized(Func`1 initializer)
   at System.Web.Http.Routing.AttributeRoutingMapper.<>c__DisplayClass2.<MapAttributeRoutes>b__0(HttpConfiguration config)
   at System.Web.Http.CorsHttpConfigurationExtensions.<>c__DisplayClass3.<AddCorsMessageHandler>b__0(HttpConfiguration config)
   at System.Web.Http.HttpConfiguration.ApplyControllerSettings(HttpControllerSettings settings, HttpConfiguration configuration)
   at System.Web.Http.Controllers.HttpControllerDescriptor.InvokeAttributesOnControllerType(HttpControllerDescriptor controllerDescriptor, Type type)
   at System.Web.Http.Dispatcher.DefaultHttpControllerSelector.InitializeControllerInfoCache()
   at System.Lazy`1.CreateValue()
   at System.Lazy`1.LazyInitValue()
   at System.Web.Http.Dispatcher.DefaultHttpControllerSelector.GetControllerMapping()
   at System.Web.Http.Routing.AttributeRoutingMapper.AddRouteEntries(SubRouteCollection collector, HttpConfiguration configuration, IInlineConstraintResolver constraintResolver, IDirectRouteProvider directRouteProvider)
   at System.Web.Http.Routing.AttributeRoutingMapper.<>c__DisplayClass2.<>c__DisplayClass4.<MapAttributeRoutes>b__1()
   at System.Web.Http.Routing.RouteCollectionRoute.EnsureInitialized(Func`1 initializer)
   at System.Web.Http.Routing.AttributeRoutingMapper.<>c__DisplayClass2.<MapAttributeRoutes>b__0(HttpConfiguration config)
   at System.Web.Http.CorsHttpConfigurationExtensions.<>c__DisplayClass3.<AddCorsMessageHandler>b__0(HttpConfiguration config)
   at System.Web.Http.HttpConfiguration.ApplyControllerSettings(HttpControllerSettings settings, HttpConfiguration configuration)
   at System.Web.Http.Controllers.HttpControllerDescriptor.InvokeAttributesOnControllerType(HttpControllerDescriptor controllerDescriptor, Type type)
   at Sitecore.Services.Infrastructure.Web.Http.Dispatcher.NamespaceHttpControllerSelector.InitializeControllerDictionary()
   at System.Lazy`1.CreateValue()
--- End of stack trace from previous location where exception was thrown ---
   at System.Lazy`1.get_Value()
   at Sitecore.Services.Infrastructure.Web.Http.Dispatcher.NamespaceHttpControllerSelector.SelectController(HttpRequestMessage request)
   at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()"

路由在global.asax.cs中注册:

protected void Application_Start(object sender, EventArgs e)
        {
            GlobalConfiguration.Configure(config =>
            {
                config.MapHttpAttributeRoutes();

                //config.Routes.MapHttpRoute(
                //    name: "DefaultApi",
                //    routeTemplate: "api/{controller}/{id}",
                //    defaults: new { id = RouteParameter.Optional }
                //);
            });
            SqlServerTypes.Utilities.LoadNativeAssemblies(Server.MapPath("~/bin"));
        }

Answer 1

This solution尝试升级时为我们工作。您应该完整阅读这篇文章以了解它在做什么，但简而言之，您需要创建一个自定义 HttpControllerSelector，并在 Sitecore 添加所有路由后将其与 Sitecore 交换。注:本摘要均非我原创。我从链接的文章中收集了所有这些内容。

顺便说一句，我强烈建议避免就地升级到 Sitecore 8。我想说，使用全新安装的 Sitecore 8 然后通过包迁移内容几乎总是更好的选择。 This blog很好地了解了这两个选项。