System.NullReferenceException for .NET 服務在 Windows Server IIS 上運行，但在 Visual Studio IIS Express 中運行時在本地工作

Question

我有一個我繼承的 .NET 項目，其中在 Windows Server IIS 上運行時，我在讓服務正確返回時遇到問題。

ExceptionType 是System.NullReferenceException

Stacktrace at Integra.HLX.SB.Web.WS_Reps..ctor() at CreateIntegra.HLX.SB.Web.WS_Reps() at System.ServiceModel.InstanceContext.GetServiceInstance(Message message) at System.ServiceModel.Dispatcher.InstanceBehavior.EnsureServiceInstance(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41(MessageRpc& rpc) at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc& rpc) at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)

當我嘗試 POST 到服務的端點時，會拋出此錯誤。 我假設我在 web.config 中遺漏了一些東西，以允許它在 Windows Server 上的 IIS 上工作，或者可能缺少 Windows Server 上的 IIS 中的功能設置。

這是相關的 web.config 設置...

<system.serviceModel> <serviceHostingEnvironment multipleSiteBindingsEnabled="true" /> <bindings> <webHttpBinding> <binding name="binding1"> <security mode="Transport" /> </binding> </webHttpBinding> </bindings> <behaviors> <endpointBehaviors> <behavior name="Integra.HLX.SB.Web.WS_RepsAspNetAjaxBehavior"> <enableWebScript /> </behavior> <behavior name="Integra.HLX.SB.Web.WS_ClientContactsAspNetAjaxBehavior"> <enableWebScript /> </behavior> <behavior name="Integra.HLX.SB.Web.WS_ContactUniverseNameAddressesAspNetAjaxBehavior"> <enableWebScript /> </behavior> <behavior name="Integra.HLX.SB.Web.WS_UsersAspNetAjaxBehavior"> <enableWebScript /> </behavior> <behavior name="jsonBehavior"> <webHttp /> </behavior> </endpointBehaviors> <serviceBehaviors> <behavior name="RESTbehavior"> <serviceMetadata httpGetEnabled="true" /> </behavior> <behavior> <serviceDebug includeExceptionDetailInFaults="true"/> </behavior> </serviceBehaviors> </behaviors> <services> <service name="Integra.HLX.SB.Web.WS_Reps"> <endpoint address="" behaviorConfiguration="Integra.HLX.SB.Web.WS_RepsAspNetAjaxBehavior" bindingConfiguration="binding1" binding="webHttpBinding" contract="Integra.HLX.SB.Web.WS_Reps" /> </service> <service name="Integra.HLX.SB.Web.WS_ClientContacts"> <endpoint address="" behaviorConfiguration="Integra.HLX.SB.Web.WS_ClientContactsAspNetAjaxBehavior" bindingConfiguration="binding1" binding="webHttpBinding" contract="Integra.HLX.SB.Web.WS_ClientContacts" /> </service> <service name="Integra.HLX.SB.Web.WS_ContactUniverseNameAddresses"> <endpoint address="" behaviorConfiguration="Integra.HLX.SB.Web.WS_ContactUniverseNameAddressesAspNetAjaxBehavior" bindingConfiguration="binding1" binding="webHttpBinding" contract="Integra.HLX.SB.Web.WS_ContactUniverseNameAddresses" /> </service> <service name="Integra.HLX.SB.Web.WS_Users"> <endpoint address="" behaviorConfiguration="Integra.HLX.SB.Web.WS_UsersAspNetAjaxBehavior" bindingConfiguration="binding1" binding="webHttpBinding" contract="Integra.HLX.SB.Web.WS_Users" /> </service> <service name="Integra.HLX.SB.Web.WS_SpeakerDataFeed" behaviorConfiguration="RESTbehavior"> <endpoint address="" bindingConfiguration="binding1" binding="webHttpBinding" behaviorConfiguration="jsonBehavior" contract="Integra.HLX.SB.Web.IWS_SpeakerDataFeed" /> </service> <service name="Integra.HLX.SB.Web.WS_DashboardDataFeed" behaviorConfiguration="RESTbehavior"> <endpoint address="" bindingConfiguration="binding1" binding="webHttpBinding" behaviorConfiguration="jsonBehavior" contract="Integra.HLX.SB.Web.IWS_DashboardDataFeed" /> </service> </services> </system.serviceModel>

任何幫助，將不勝感激。 謝謝！

Answer 1

我能夠回答我自己的問題。 在這種情況下，我的修復是生產服務器上的 web.config 缺少行<serviceHostingEnvironment aspNetCompatibilityEnabled="true" />

我通過檢查 Windows 事件查看器日志發現了更多信息，並發現了這個關鍵信息The service cannot be activated because it requires ASP.NET compatibility.

將上述行插入 web.config 並重新啟動 AppPool 和服務器后，服務開始正常工作。 我希望這對未來的任何人都有幫助。