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c#service-model

Why the exception: System.TypeLoadException (Could not load type 'System.ServiceModel.ExceptionHelper') is thrown?

I am programming a ArcGIS Pro 3.1 AddIn with C#.

The following line

var pipeFactory = new ChannelFactory<IWCFStarter>(new NetNamedPipeBinding(),
                                                  new EndpointAddress("net.pipe://localhost/SomeAdress"));

throws this exception:

Exceptioninfo: 
Type: System.TypeLoadException 
ExceptionMessage: 
Could not load type 'System.ServiceModel.ExceptionHelper' from assembly 'System.ServiceModel.Primitives, Version=4.9.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
Source: System.ServiceModel.NetNamedPipe 
Stack: 
   at System.ServiceModel.NetNamedPipeBinding..ctor() 
   at ARCBAR.InfoWindow.updateAddin_Click(Object sender, RoutedEventArgs e) in C:\ARCBAR\ARCBAR\InfoWindow.xaml.cs:line 35

But the project has the NuGetPagages added:

<ItemGroup>
    <PackageReference Include="System.Drawing.Common" Version="7.0.0" />
    <PackageReference Include="System.ServiceModel.NetNamedPipe" Version="6.0.0" />
    <PackageReference Include="System.ServiceModel.Primitives" Version="6.0.0" />
</ItemGroup>

In another project the same thing works perfectly fine. And I cant find any meaningful differences in the dependencies and nuGet-Packages.

Updates:

  • I searched all my code for "<PackageReference Include="System.ServiceMode" and found only references to: "". No other mentions.
  • .I started ArcGIS Pro 3.1 without loading my addIn and used "Debug/Attach to process" + "debug/Windows/modules" to see which assamblies are loaded by ArcGIS itself without my AddIn. And there are 2 dlls with "serviceModel" in the name:
  • System.ServiceModel.Primitives.dll C:\Program Files\ArcGIS\Pro\bin\System.ServiceModel.Primitives.dll Yes No Skipped loading symbols. 115 4.900.21.52002
  • System.Private.ServiceModel.dll System.Private.ServiceModel.dll C:\Program Files\ArcGIS\Pro\bin\System.Private.ServiceModel.dll
Solution

  • With the help of Oliver, Zdeněk Jelínek and Panagiotis Kanavos I found a solution (unfortunately a bad one):

    I started ArcGIS Pro 3.1 without loading my addIn and used "Debug/Attach to process" + "debug/Windows/modules" to see which assamblies are loaded by ArcGIS itself without my AddIn.

    So I found out that ArcGIS itself loads "System.ServiceModel.Primitives.dll" in version 4.900.21.52002 from "C:\Program Files\ArcGIS\Pro\bin\System.ServiceModel.Primitives.dll"

    I need System.ServiceModel.NetNamedPipe and this needs System.ServiceModel.Primitives in Version 6.0.0.

    So I replaced "C:\Program Files\ArcGIS\Pro\bin\System.ServiceModel.Primitives.dll" with the 6.0.0 Version from my bin/release-folder.

    This seems to work at first glance.

    But for obvious reasons this is not a very good solution. I prefere not to change any installed files from ArcGIS-Pro.