Solvedazure functions host Azure function project doesn't copy system.private.servicemodel.dll to the output directory

From @Lxiamail on October 2, 2018 0:35

When Azure function references and uses one of WCF core packages (like system.servicemodel.http), system.private.servicemodel.dll, which system.servicemodel.http depends on, is not copied to output directory together with system.servicemodel.http. The azure function fails for can't find system.private.servicemodel.dll. Looks like other WCF core dependencies (like system.servicemodel.primitives.dll) are copied correctly, but system.private.servicemodel.dll. My guess is that Azure function may not handle the reference assembly, façade and implementation assembly pattern correctly.
Some background of WCF Core packages, system.servicemodel.*.dll (like system.servicemodel.http) are reference assemblies (in ref directory of the package) facade assemblies (in lib directory of the package), The façade assemblies don't have implementation, all they do is typeforward to the implementation assembly system.private.servicemodel.dll. App never directly references to system.private.servicemodel.dll. .NET Corefx follows the same façade and implementation pattern. The difference between WCF Core packages and .NET CoreFX packages is .NET CoreFX are in .NET Core SDK as shared framework, but WCF Core doesn't. This is why mscorlib.dll is not copied to app output directory, but still can be loaded.

OS: windows 10 version 1803 (OS build 17134.286)

VS: VS pro 2017 version 15.7.5

Repro steps:

Create a new Azure function http trigger Project,
Add system.servicemodel.http Nuget package to the reference using NugetPackage manager
Add
Use this repo to file issues in documentation or the Functions Visual Studio tooling.
Adding the follow code in Function1.Run() function to make the function to use something implemented in WCF Core packages.
System.ServiceModel.BasicHttpBinding binding = new System.ServiceModel.BasicHttpBinding();
binding.Name = "binding1";

Build and debug the azure function in VS, after the function is trigger by Http request, you will get the following error:
[10/1/2018 11:39:36 PM] Executing 'Function1' (Reason='This function was programmatically called via the host APIs.', Id=67985bea-8a52-431a-8d65-4ded513269ce)
[10/1/2018 11:39:36 PM] Exception during runtime resolution of assembly 'System.Private.ServiceModel, Version=4.5.0.3, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a': 'System.InvalidCastException: [A]System.AppDomain cannot be cast to [B]System.AppDomain. Type A originates from 'System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' in the context 'Default' at location 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.0.9\System.Private.CoreLib.dll'. Type B originates from 'System.Runtime.Extensions, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' in the context 'Default' at location 'C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.0.9\System.Runtime.Extensions.dll'.
[10/1/2018 11:39:36 PM] at Microsoft.Azure.WebJobs.Script.Description.FunctionAssemblyLoader.ResolveAssembly(Object sender, ResolveEventArgs args) in C:\azure-webjobs-sdk-script\src\WebJobs.Script\Description\DotNet\FunctionAssemblyLoader.cs:line 66'
[10/1/2018 11:39:36 PM] Unable to find assembly 'System.Private.ServiceModel, Version=4.5.0.3, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. Are you missing a private assembly file?
[10/1/2018 11:39:37 PM] Executed 'Function1' (Failed, Id=67985bea-8a52-431a-8d65-4ded513269ce)
[10/1/2018 11:39:37 PM] System.Private.CoreLib: Exception while executing function: Function1. FunctionApp4: Could not load file or assembly 'System.Private.ServiceModel, Version=4.5.0.3, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified.

Copied from original issue: Azure/Azure-Functions#974

44 Answers

✔️Accepted Answer

I had to create a CopyToPublishDirectory ItemGroup and specify direct path to the assembly, just like in the Build target. This way it's picked up correctly when publishing, and I have the publish working from both local and from DevOps pipeline.

Edit: CopyToOutputDirectory ItemGroup doesn't do anything in this case and I don't even have that in my .csproj

  <!--
  this is temporary workaround for issue https://github.com/dotnet/wcf/issues/2824 
  also requires nuget package
  -->
  <Target Name="CopySPSM" BeforeTargets="Build">
    <Copy SourceFiles="$(USERPROFILE)\.nuget\packages\system.private.servicemodel\4.5.3\runtimes\win\lib\netstandard2.0\System.Private.ServiceModel.dll" DestinationFolder="$(OutputPath)\bin" />
  </Target>
  <ItemGroup>
    <None Include="$(USERPROFILE)\.nuget\packages\system.private.servicemodel\4.5.3\runtimes\win\lib\netstandard2.0\System.Private.ServiceModel.dll" CopyToPublishDirectory="Always" />
  </ItemGroup>
  <!--end workaround-->

Other Answers:

Still won't work for me, even with the workarounds. I simply cannot compile a function project that contains a service reference. I always get:

C:\Users\nils.nuget\packages\microsoft.net.sdk.functions\1.0.27\build\netstandard1.0\Microsoft.NET.Sdk.Functions.Build.targets(41,5): error : System.IO.FileNotFoundException: Could not load file or assembly 'System.Private.ServiceModel, Version=4.1.2.4, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. Das System kann die angegebene Datei nicht finden.
1>C:\Users\nils.nuget\packages\microsoft.net.sdk.functions\1.0.27\build\netstandard1.0\Microsoft.NET.Sdk.Functions.Build.targets(41,5): error : File name: 'System.Private.ServiceModel, Version=4.1.2.4, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'

...
Error generating functions metadata

@fabiocav, this arguably shouldn't have been closed. Or at least, I wouldn't consider this closed until such a time when "workarounds" aren't needed anymore. Would you agree?

I had to alter my custom MSBuild <Target>s slightly from what was provided above. The function.deps.json wasn't getting included in my ZIP package; not sure if the prior solution works if you don't use ZIP package deployments, I didn't bother checking. Here's what I went with:

<Target Name="PostBuild" AfterTargets="PostBuildEvent">
  <!-- https://github.com/Azure/azure-functions-host/issues/3568 -->
  <Exec Command="copy $(OutDir)$(ProjectName).deps.json $(OutDir)bin\function.deps.json" />
</Target>
<Target Name="PostPublish" BeforeTargets="CreateZipFile">
  <!-- https://github.com/Azure/azure-functions-host/issues/3568 -->
  <Exec Command="copy $(PublishDir)$(ProjectName).deps.json $(PublishDir)bin\function.deps.json" />
</Target>

Only meaningful change from above was revising PostPublish to use BeforeTargets="CreateZipFile".

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