I have an console-app with hosted WebAPI (HttpSelfHostServer).
In the console-app I have Controllers that query data from SQL-Server.
The console-app works without problems (from fiddler and a Windows_client) Now I want to host the WebAPI (HttpSelfHostServer) in a Windows-Service.
Therefore I have created a Service-Project and referenced the Controllers in console-app-dll so that the controllers should be found.
To have a minimal chance to debug, I write some information in the event log from the windows service.
I can start and stop the windows-service without problems. It also seems as that the httpselfhost is started and active.
Problem: - By first attempt to the url, the service crashes hard with:
System.NullReferenceException (eventlog-entry to .net RunTime) Anwendung: WS_MatrixGuide.exe Frameworkversion: v4.0.30319 Beschreibung: Der Prozess wurde aufgrund einer unbehandelten Ausnahme beendet. Ausnahmeinformationen: **System.NullReferenceException** Stapel: bei System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>b__5(System.Object) bei System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(System.Object) bei System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean) bei System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean) bei System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem() bei System.Threading.ThreadPoolWorkQueue.Dispatch() bei System.Threading._ThreadPoolWaitCallback.PerformWaitCallback() I have tried for days to solve the problem, and I am desperate.
As I am not able to debug the service, I don't know where exactly the crash occurs.
I think, the start of the self-host in the windows-service works and the host also is reachable (as it crashes by first access).
So.. maybe I did something completely wrong in the service or I missed something important..
As the console-app works without problems, I post in the following only the code from the windows-service: Code to Windows-Service:
Imports System Imports System.ServiceProcess Imports System.ServiceModel Imports KA_MatrixGuide.Controllers ' Verweis auf Controller in KA_MatrixGuide (Konsolenanwendung) erstellen Imports System.Net.Mail Imports System.Web.Http.SelfHost ' Self Hosting Imports System.Web.Http Imports System.IO Public Class WS_MatrixGuide Private SH As ServiceHost Public Sub New() InitializeComponent() Me.ServiceName = "WS_MatrixGuide" End Sub Protected Overrides Sub OnStart(ByVal args() As String) EventLog.WriteEntry("Vor SH = new...", System.Diagnostics.EventLogEntryType.Information) SH = New ServiceHost(GetType(WS_MatrixGuide)) AddHandler SH.Faulted, AddressOf SH_Faulted EventLog.WriteEntry("Vor Dim config...", System.Diagnostics.EventLogEntryType.Information) Dim config As New HttpSelfHostConfiguration("http://127.0.0.1:21212") EventLog.WriteEntry("Vor Config-Routes...", System.Diagnostics.EventLogEntryType.Information) config.Routes.MapHttpRoute( _ name:="DefaultApi", _ routeTemplate:="api/{controller}/{id}", _ defaults:=New With {.id = RouteParameter.Optional} _ ) 'Tracing-Info's in Event-Log schreiben... EventLog.WriteEntry("Vor Using Server...", System.Diagnostics.EventLogEntryType.Information) Using server As New HttpSelfHostServer(config) ' Objekte zu Controllern erstellen (Interface für Zugriff) Dim SQL_C As Type = GetType(KA_MatrixGuide.Controllers.SQLController) Dim Beauty_C As Type = GetType(KA_MatrixGuide.Controllers.BeautyController) Dim Freizeit_C As Type = GetType(KA_MatrixGuide.Controllers.FreizeitController) Dim Gourmet_C As Type = GetType(KA_MatrixGuide.Controllers.GourmetController) Dim Konfiguration_C As Type = GetType(KA_MatrixGuide.Controllers.KonfigurationController) Dim Empfehlungen_C As Type = GetType(KA_MatrixGuide.Controllers.EmpfehlungenController) Try EventLog.WriteEntry("Vor Server.OpenAsync...", System.Diagnostics.EventLogEntryType.Information) server.OpenAsync().Wait() EventLog.WriteEntry("Nach Server.OpenAsync...", System.Diagnostics.EventLogEntryType.Information) Catch aggEx As AggregateException EventLog.WriteEntry("Fehler beim Laden des Servers (httpSelfHostServer)...", System.Diagnostics.EventLogEntryType.Information) End Try 'Console.WriteLine() 'Console.WriteLine("Enter-Taste drücken, um die Konsolen-Anwendung zu beenden.") 'Console.ReadLine() 'AddHandler server.Faulted, AddressOf Server_Faulted ' => es gibt kein Server.Faulted End Using 'EventLog.WriteEntry("WS_MatrixGuide wurde gestartet", System.Diagnostics.EventLogEntryType.Information) EventLog.WriteEntry("Vor SH.Open...", System.Diagnostics.EventLogEntryType.Information) SH.Open() EventLog.WriteEntry("Nach SH.Open...", System.Diagnostics.EventLogEntryType.Information) End Sub Protected Overrides Sub OnStop() Dim Infomeldung As String = "WS_MatrixGuide wurde gestoppt" EventLog.WriteEntry(Infomeldung, System.Diagnostics.EventLogEntryType.Information) SH.Close() SH = Nothing End Sub Private Sub SH_Faulted() ' Eigener Fehlerhandler Dim Fehlermeldung As String = "Fehler bei Ausführung von WS_MatrixGuide. Service wurde gestoppt" EventLog.WriteEntry(Fehlermeldung, System.Diagnostics.EventLogEntryType.Error) Dim cMsg As String = "Fehler bei der Ausführung von WS_MatrixGuide. Der Service wurde gestoppt." Dim SMTPMail As New SmtpClient SMTPMail.Host = "zrhms200" SMTPMail.Port = 25 ' Standard-Port Dim msg As New MailMessage msg.From = New MailAddress("Service@matso.ch") msg.To.Add("fredy.wenger@matso.ch") msg.Subject = cMsg msg.Body = cMsg SMTPMail.Send(msg) End Sub End Class I'm working with VS2013, VB.NET and Win 8.1.
The .net RunTime is installed, all actual updates are installed.
Any help will highly appreciated
Thanks a lot for a first fast answer
Fredy