WCF Service attribute value in the ServiceHost directive could not be found

Question

I m trying to host my service with IIS 6 but I keep get this exception       Server Error in   WebServices  Application  --------------------------------------------------------------------------------  The type  QS DialogManager Communication IISHost RecipientService   provided as the Service attribute value in the ServiceHost directive could not be found   Description  An unhandled exception occurred during the execution of the current web request  Please review the stack trace for more information about the error and where it originated in the code    Exception Details  System InvalidOperationException  The type  QS DialogManager Communication IISHost RecipientService   provided as the Service attribute value in the ServiceHost directive could not be found   Source Error    An unhandled exception was generated during the execution of the current web request  Information regarding the origin and location of the exception can be identified using the exception stack trace below     Stack Trace      InvalidOperationException  The type  QS DialogManager Communication IISHost RecipientService   provided as the Service attribute value in the ServiceHost directive could not be found      System ServiceModel Activation ServiceHostFactory CreateServiceHost String constructorString  Uri   baseAddresses   6714599    System ServiceModel HostingManager CreateService String normalizedVirtualPath   604    System ServiceModel HostingManager ActivateService String normalizedVirtualPath   46    System ServiceModel HostingManager EnsureServiceAvailable String normalizedVirtualPath   654   ServiceActivationException  The service   WebServices dm RecipientService svc  cannot be activated due to an exception during compilation   The exception message is  The type  QS DialogManager Communication IISHost RecipientService   provided as the Service attribute value in the ServiceHost directive could not be found       System ServiceModel AsyncResult End IAsyncResult result   15626880    System ServiceModel Activation HostedHttpRequestAsyncResult End IAsyncResult result   15546921    System ServiceModel Activation HostedHttpRequestAsyncResult ExecuteSynchronous HttpApplication context  Boolean flowContext   265    System ServiceModel Activation HttpModule ProcessRequest Object sender  EventArgs e   227    System Web SyncEventExecutionStep System Web HttpApplication IExecutionStep Execute    80    System Web HttpApplication ExecuteStep IExecutionStep step  Boolean amp  completedSynchronously   171     -------------------------------------------------------------------------------- Version Information  Microsoft  NET Framework Version 2 0 50727 3082  ASP NET Version 2 0 50727 3082    I have absolutely no clue except that it seems like it can t find my assemblies  The code should be correctly compiled with public classes   Here is my  svc file    lt    ServiceHost Language  C   Debug  true  Service  QS DialogManager Communication IISHost RecipientService  CodeBehind  RecipientService svc cs    gt    I have tried to create a very very simple service that contains just nothin too see if this would work but still the same old error shows up   The type  IISHost Service1   provided as the Service attribute value in the ServiceHost directive could not be found

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This may sound trivial  but worth mentioning  You have to build the service  in Visual Studio  - then a DLL will be created in the bin subfolder   When the service is  deployed  on a server - that bin folder needs to have that DLL file in it - otherwise this error will be thrown

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Double check that you re referencing the correct type from the ServiceHost directive in the  svc file   Here s how      In the VS project containing your web service  open the  svc file in the XML editor  right-click the file  Open With     choose XML  Text  Editor  OK    Note the  Service  attribute value   Make sure it matches the fully qualified type name of your service   This includes the namespace   type name   For example  if the namespace is  MyCompany Department Services  and the class is called  MyService   then the Service attribute value should be  MyCompany Department Services MyService

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I got this error when trying to add the Service reference for the first Silverlight enabled WCF in the same solution  I just build the  Web project and it started working

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I faced with this error today  reason was  IIS user doesn t have permission to reach to the application folder  I gave the read permissions to the app root folder

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I had the same problem but no clue what caused it  I Solved it by changing from Debug to Release and Run using Debug Start New Instance  After that  it ran in both Release and Debug  It was magic

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The problem could also be a in a different namespace in svc file as it is in svc cs file   In svc file namespace must be in the following format   Service  Namespace SvcClassName

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I had my service dll s in the bin folder where the svc file was residing  Moving the dll s to the root bin folder solved the problem

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Two keys to this for certain flavors of the   Service attribute value in the ServiceHost directive could not be found -problem   1  If you re working in Silverlight  you should use the Silverlight WCF-Enabled Service  not the non-Silverlight WCF Service  this will update Web Config for the bindings and allow the type to be visible   2  Match the class name in the new service to the Service name -- the goal here is to make a wsdl    so that you know the service s functionality is exposed to your Silverlight client and to the Web  it helps to have the service match the class  If you get the names gummed up  you will have to edit the Web Config in 3 places  serviceBehaviors  services and bindings    There were so many sincere attempts to help folks with this problem that were not helpful to me that it should be stressed that this write-up is for a Silverlight solution and it may not apply for someone not using Silverlight 3 in a client Web configuration   Hope it helps

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I had the same Exception  this is due to the Type not correctly mentioned in the  svc file  I corrected with below fix   if your  svc cs has class like this  namespace Azh Services MyApp       public class WcfApp   FI IWcfAppService             for this the  svc file should look like this   lt    ServiceHost Language  C   Debug  true  Service  Azh Services MyApp WcfApp  CodeBehind  WcfApp svc cs    gt

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You should configure your bin folder path to service local bin

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Make sure markup  svc  file has service attribute with namespace classname and codebehind will be classname svc cs Rebuild the solution  Restart the app pools from local IIS once

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In my case Right Click on Virtual Directory and Select  Convert To Application  worked

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I practically solved the same issue   Here is my suggestion -- The error means that the object referenced in the Service attribute is not found   For the object to be found  the application or library must build output to the bin folder   You can edit property page of the application and specify the output path to  bin

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I know this is probably the  obvious  answer  but it tripped me up for a bit  Make sure there s a dll for the project in the bin folder  When the service was published  the guy who published it deleted the dlls because he thought they were in the GAC  The one specifically for the project  QS DialogManager Communication IISHost RecipientService dll  in this case  wasn t there   Same error for a VERY different reason

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Option One   This message is often due to an IIS 7 config problem   If you are used to creating a virtual directory pointing to the folder where your service resides  that no longer works  Now  you need to use the  Create Application     option instead   Other Options    WCF  The type provided as the Service attribute could not be found   The type   provided as the Service attribute value in the ServiceHost directive could not be found

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This error occurs due to mismatch of Service name in  SVC file  Probably you might have changed the name of the service class that is implementing the interface The Solution is to open  SVC file and exactly match the Service attribute and CodeBehind Attribute  So your  SVC file should be like   lt    ServiceHost Language  Language you are using  Debug  bool value to enable debugging  Service  Service class name that is implementing your Service interface  Codebehind    Appcode Class implementing interface cs   gt   for eg    lt    ServiceHost Language  C   Debug  true  Service  Product Service  CodeBehind    AppCode Product Service cs   gt    This example is for  svc file that is using C  language  with debugging enabled  Service class implementing interface and this class is within app folder with name Service cs and Product is namespace for Service class   Also Please make respective change in service config file    lt system serviceModel gt       lt services gt           lt service name  Product Service  behaviorConfiguration  ServiceBehavior  gt               lt endpoint address    binding  wsHttpBinding  contract  Product Iservice  gt               lt  endpoint gt               lt endpoint address  mex  binding  mexHttpBinding  contract  IMetadataExchange   gt           lt  service gt       lt  services gt       lt behaviors gt           lt behavior name  ServiceBehavior  gt               lt serviceMetaData httpGetEnabled  true   gt               lt serviceDebug includeExceptionDetailInFaults  false   gt           lt  behavior gt       lt  behaviors gt   lt  system serviceModel gt

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I had the same problem  found this thread  tried all but nogo   Then I spend another 4 hours wasted time   Then I found that the compilation settings had changed from 64bits to x86  When I changed it back to 64bits it worked  Don t know exactly why but could be that the IIS application pool was not set to allow 32 bit applications

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I also ran into this issue trying the Microsoft ServiceModel Samples Calculator WCF sample  I am using IIS 5 1  I resolved it by ensuring that the website that was auto-generated  servicemodelsamples  was not an application  Right-click the folder  click  Properties  and click the  Create  button

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Building the solution before adding the service reference solved my problem

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I had this problem - my service type was in the GAC  It WOULD work if i added the dll containing the type to the bin folder but as it was in the GAC this was NOT what I wanted  I eventually added this to the web config for the service   lt system web gt       lt customErrors mode  RemoteOnly    gt       lt compilation debug  true  targetFramework  4 0  gt           lt assemblies gt               lt add assembly   name in GAC   Version  version in GAC   Culture neutral  PublicKeyToken  ac token     gt           lt  assemblies gt       lt  compilation gt   lt  system web gt    and it worked without needing any dlls in the bin folder

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If you have renamed anything verify the  Properties   AssemblyInfo cs is correct  as well as the header in the service file   ServiceName svc   lt    ServiceHost Language  C   Debug  true  Service  Company Namespace WcfApp  CodeBehind  WcfApp svc cs    gt    Aligning with your namespace in your Service svc cs

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Add reference of service in your service or copy dll

[c#] WCF, Service attribute value in the ServiceHost directive could not be found

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