crossdomain.xml on WCF Service hosted by Windows Service - wcf

Question

I am trying to make my Windows Service, which hosts a WCF service cross-domain compatible.
After hours and hours of searching I was told that I needed to create another service which will load the crossdomain.xml and clientaccesspolicy.xml files so that the Windows hosted WCF service can be run on any domain.
This is my main service :
Namespace UmbrellaMobileService
<RunInstaller(True)> _
Public Class ProjectInstaller
Inherits Installer
Private process As ServiceProcessInstaller
Private service As ServiceInstaller
Private components As System.ComponentModel.Container
Public Sub New()
process = New ServiceProcessInstaller()
process.Account = ServiceAccount.LocalSystem
service = New ServiceInstaller()
service.ServiceName = "UmbrellaMobileService"
service.DisplayName = "Umbrella Mobile Service"
service.Description = "Handels Umbrella Mobile Requests."
Installers.Add(process)
Installers.Add(service)
End Sub
End Class
<ServiceBehavior(InstanceContextMode:=InstanceContextMode.PerSession)> _
Public Class UmbrellaMobileService
Inherits ServiceBase
Public serviceHost As ServiceHost = Nothing
Public CrossDomainServiceHost As ServiceHost = Nothing
Public Shared Sub Main()
ServiceBase.Run(New UmbrellaMobileService())
End Sub
Public Sub New()
ServiceName = "UmbrellaMobileService"
End Sub
'Start the Windows service.
Protected Overloads Overrides Sub OnStart(ByVal args As String())
If serviceHost IsNot Nothing Then
serviceHost.Close()
End If
serviceHost = New WebServiceHost(GetType(UmbrellaService), New Uri("http://localhost/UmbrellaMobileService"))
serviceHost.AddServiceEndpoint(GetType(IUmbrellaMobileService), New WebHttpBinding(), "http://localhost/UmbrellaMobileService")
CrossDomainServiceHost = New ServiceHost(GetType(CrossDomainService))
Else
System.Diagnostics.EventLog.WriteEntry("Umbrella Mobile Service", objIniFile.ErrorMessage, EventLogEntryType.Error)
serviceHost.Close()
CrossDomainServiceHost.Close()
End If
serviceHost.Open()
CrossDomainServiceHost.Open()
End Sub
' Stop the Windows service.
Protected Overloads Overrides Sub OnStop()
If serviceHost IsNot Nothing Then
serviceHost.Close()
CrossDomainServiceHost.Close()
serviceHost = Nothing
End If
End Sub
End Class
<AspNetCompatibilityRequirements(Requirementsmode:=AspNetCompatibilityRequirementsMode.Allowed)> _
Public Class UmbrellaService
Inherits System.Web.Services.WebService
Implements IUmbrellaMobileService
Function GetCustomers() As Stream Implements IUmbrellaMobileService.GetCustomers
'Function Logic
End Function
End Class
End Namespace
This is my Implementation of my main service:
Namespace UmbrellaMobileService
<ServiceContract()> _
Public Interface IUmbrellaMobileService
<OperationContract()> _
<WebInvoke(Method:="GET", BodyStyle:=WebMessageBodyStyle.Bare, ResponseFormat:=WebMessageFormat.Json, RequestFormat:=WebMessageFormat.Json)> _
Function GetCustomers() As Stream
End Interface
End Namespace
This is the 'Cross Domain Service' I was advised to add:
Namespace UmbrellaMobileService
Public Class CrossDomainService
Implements ICrossDomainService
Public Function ProvidePolicyFile() As System.ServiceModel.Channels.Message Implements ICrossDomainService.ProvidePolicyFile
Dim filestream As FileStream = File.Open("ClientAccessPolicy.xml", FileMode.Open)
' Either specify ClientAccessPolicy.xml file path properly
' or put that in \Bin folder of the console application
Dim reader As XmlReader = XmlReader.Create(filestream)
Dim result As System.ServiceModel.Channels.Message = Message.CreateMessage(MessageVersion.None, "", reader)
Return result
End Function
End Class
End Namespace
And here is its Implementation :
Namespace UmbrellaMobileService
<ServiceContract()> _
Public Interface ICrossDomainService
<OperationContract(), WebGet(UriTemplate:="ClientAccessPolicy.xml")> _
Function ProvidePolicyFile() As Message
End Interface
End Namespace
My config file looks like this :
<?xml version="1.0"?>
<configuration>
<system.serviceModel>
<serviceHostingEnvironment aspNetCompatibilityEnabled="true"/>
<behaviors>
<serviceBehaviors>
<behavior name="MyServiceBehavior">
<serviceMetadata httpGetEnabled="true"/>
<serviceDebug includeExceptionDetailInFaults="false"/>
</behavior>
</serviceBehaviors>
<endpointBehaviors>
<behavior name="CrossDomainServiceBehavior">
<webHttp/>
</behavior>
</endpointBehaviors>
</behaviors>
<services>
<service behaviorConfiguration="MyServiceBehavior" name="UmbrellaMobileService.UmbrellaMobileService">
<endpoint address="" binding="basicHttpBinding" contract="UmbrellaMobileService.IUmbrellaMobileService">
</endpoint>
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
<host>
<baseAddresses>
<add baseAddress="http://localhost:8731/UmbrellaMobileService"/>
</baseAddresses>
</host>
</service>
<service name="UmbrellaMobileService.CrossDomainService">
<host>
<baseAddresses>
<add baseAddress="http://localhost:8731/"/>
</baseAddresses>
</host>
<endpoint address="" binding="webHttpBinding" contract="UmbrellaMobileService.ICrossDomainService" behaviorConfiguration="CrossDomainServiceBehavior"/>
</service>
</services>
</system.serviceModel>
<system.web>
<compilation debug="true"/></system.web></configuration>
Now, I get this error when I attempt to run this service:
Service cannot be started. System.InvalidOperationException: Service has zero application (non-infrastructure) endpoints.
This might be because no configuration file was found for your application,
or because no service element matching the service name could be found in the configuration file, or because no endpoints were defined in the service element.
I have searched and searched and still do not know what to do, can anyone give me some advice?

Answer 1

I had the same issue and here is how I fixed it.
First, create a new service class that will serve up the clientaccesspolicy.xml when a client requests it:
[ServiceContract]
public class CrossDomainPolicyService
{
private Stream StringToStream(string result)
{
WebOperationContext.Current.OutgoingResponse.ContentType = "application/xml";
return new MemoryStream(Encoding.UTF8.GetBytes(result));
}
[OperationContract, WebGet(UriTemplate = "/clientaccesspolicy.xml")]
public Stream GetClientAccessPolicy()
{
string result = #"<?xml version=""1.0"" encoding=""utf-8""?>
<access-policy>
<cross-domain-access>
<policy>
<allow-from http-request-headers=""*"">
<domain uri=""*""/>
</allow-from>
<grant-to>
<resource path=""/"" include-subpaths=""true""/>
</grant-to>
</policy>
</cross-domain-access>
</access-policy>";
return StringToStream(result);
}
}
Next, modify your app.config file to expose the new service:
<system.serviceModel>
<behaviors>
<serviceBehaviors>
<behavior name="">
<serviceMetadata httpGetEnabled="true" httpsGetEnabled="true" />
<serviceDebug includeExceptionDetailInFaults="true" />
</behavior>
</serviceBehaviors>
<endpointBehaviors>
<behavior name="policyBehavior">
<webHttp />
</behavior>
</endpointBehaviors>
</behaviors>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
<services>
<service name="MyNamespace.MyService">
<endpoint address="" binding="basicHttpBinding" contract="MyNamespace.IMyService">
<identity>
<dns value="localhost" />
</identity>
</endpoint>
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
<host>
<baseAddresses>
<add baseAddress="http://localhost:9876/MyService/" />
</baseAddresses>
</host>
</service>
<service name="MyNamespace.CrossDomainPolicyService">
<endpoint address="" binding="webHttpBinding" contract="MyNamespace.CrossDomainPolicyService" behaviorConfiguration="policyBehavior">
<identity>
<dns value="localhost" />
</identity>
</endpoint>
<host>
<baseAddresses>
<!-- Root Domain where the other service is hosted -->
<add baseAddress="http://localhost:9876/" />
</baseAddresses>
</host>
</service>
</services>
</system.serviceModel>
... and that should do it!