How can I get rid of the "The target assembly contains no service types" error message in VS2008?

Brann_47341 0
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I've got a Client/Server wcf application

My executable doesn't define any ServiceContract, it doesn't even have a reference to System.ServiceModel (but instead has a reference to an assembly which contains the connection logic to the server)

I've another assembly, which is referenced by my EXE, which contains a ServiceContract.

It used to work fine. Yesterday, I've played a lot with my project settings (partial trust, full trust, deployment settings, and so on) and now, each and every time I launch my client, I've got the following message box :

Microsoft WCF Service Host
The target assembly contains no service types.
You may need to adjust the Code Access Security policy of this assembly.

Then VS freezes for 1 minute, and eventually lets me debug my program as usual.

I've found a post on this problem, but the solution doesn't apply in my situation. Any ideas?

visual-studio-2008 wcf debugging .net
9 Answers

It's always like that. You search for 2 hours, you eventually end up posting on SO, and 5 minutes later, you find the answer.

In the WCF Options tab of the properties of the project defining the ServiceContract, there's a checkbox labelled "Start WCF Service Host when debugging another project in the same solution" that I unchecked.

I've no idea how it has been checked in the first place.

Anyway, that solved my problem. See the MSDN Reference for this project setting.

Brann_473410

To determine project with this problem find string 3D9AD99F-2412-4246-B90B-4EAA41C64699 in your project files.

Example: <ProjectTypeGuids>{3D9AD99F-2412-4246-B90B-4EAA41C64699};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>

Then turn off project option "WCF Options/Start WCF Service Host when debugging another project in the same solution"

user_12806240

In my case the problem was, because one of the normal class library project (that was referenced by the WCF service library) had this in it's .csproj file:

<ProjectExtensions>
    <VisualStudio>
      <FlavorProperties GUID="{3D9AD99F-2412-4246-B90B-4EAA41C64699}">
        <WcfProjectProperties>
          <AutoStart>True</AutoStart>
        </WcfProjectProperties>
      </FlavorProperties>
    </VisualStudio>
  </ProjectExtensions>

Changing this to False solved the problem. This answer was already there, but make sure that you checked all projects, not just the WCF service library one.

user_116948580
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