"Could not load type" Error

I’m attempting to load types from a 4.72 framework project using the dotnet-typegen cli tool.

So, I guess my first question right off the bat is, can I do that? It worked for the first few .dlls I threw at it. And it was preferable to the older legacy package manager console tool, because then I could run it in my npm scripts.

Assuming I can use the dotnet-typegen tool for 4.72 projects, here’s my situation:

First, I had this in my tgconfig.json:

{
    "assemblies": [
        "./Res.Proposals.Api/bin/Local/net472/RES.Proposals.Api.dll",
        "./Res.Proposals.Api/bin/Local/net472/RES.Proposals.Domain.dll",
    ],
    "externalAssemblyPaths": [
        "./RES/bin/net472/RES.dll"
    ],
    "enumStringInitializers": true,
    "outputPath": "./RES.Web/frontend/src/types",
    "singleQuotes": true,
    "propertyNameConverters": [],
    "filenameConverters": [],
    "clearOutputDirectory": true
}

I run dotnet-typegen generate and everything worked great, I got this output:

Generated [x].ts
Generated [y].ts
Generated [z].ts
...yada yada and then...
Files for project "." generated successfully.

Boom, everything was great. But then I actually wanted to add an enum from our core library, so I added a single TSExportEnum attribute and I moved the dll from externalAssemblyPath to my assemblies list, like so:

{
    "assemblies": [
        "./Res.Proposals.Api/bin/Local/net472/RES.Proposals.Api.dll",
        "./Res.Proposals.Api/bin/Local/net472/RES.Proposals.Domain.dll",
        "./RES/bin/net472/RES.dll"
    ],
    "enumStringInitializers": true,
    "outputPath": "./RES.Web/frontend/src/types",
    "singleQuotes": true,
    "propertyNameConverters": [],
    "filenameConverters": [],
    "clearOutputDirectory": true
}

And suddenly we got problems.

Could not resolve assembly: System.Configuration.ConfigurationManager, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51 in any of the searched directories: C:\Users\apv\.nuget\packages\; C:\Program Files\dotnet\sdk/NuGetFallbackFolder; C:\Program Files\dotnet\shared
Could not resolve assembly: System.Configuration.ConfigurationManager, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51 in any of the searched directories: C:\Users\apv\.nuget\packages\; C:\Program Files\dotnet\sdk/NuGetFallbackFolder; C:\Program Files\dotnet\shared
Could not resolve assembly: System.Configuration.ConfigurationManager, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51 in any of the searched directories: C:\Users\apv\.nuget\packages\; C:\Program Files\dotnet\sdk/NuGetFallbackFolder; C:\Program Files\dotnet\shared
Could not resolve assembly: System.Configuration.ConfigurationManager, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51 in any of the searched directories: C:\Users\apv\.nuget\packages\; C:\Program Files\dotnet\sdk/NuGetFallbackFolder; C:\Program Files\dotnet\shared
Could not resolve assembly: System.Configuration.ConfigurationManager, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51 in any of the searched directories: C:\Users\apv\.nuget\packages\; C:\Program Files\dotnet\sdk/NuGetFallbackFolder; C:\Program Files\dotnet\shared
Could not resolve assembly: System.Data.SqlClient, Version=0.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a in any of the searched directories: C:\Users\apv\.nuget\packages\; C:\Program Files\dotnet\sdk/NuGetFallbackFolder; C:\Program Files\dotnet\shared
Could not resolve assembly: System.Data.SqlClient, Version=0.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a in any of the searched directories: C:\Users\apv\.nuget\packages\; C:\Program Files\dotnet\sdk/NuGetFallbackFolder; C:\Program Files\dotnet\shared
Could not resolve assembly: System.Data.SqlClient, Version=0.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a in any of the searched directories: C:\Users\apv\.nuget\packages\; C:\Program Files\dotnet\sdk/NuGetFallbackFolder; C:\Program Files\dotnet\shared
Could not resolve assembly: System.Configuration.ConfigurationManager, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51 in any of the searched directories: C:\Users\apv\.nuget\packages\; C:\Program Files\dotnet\sdk/NuGetFallbackFolder; C:\Program Files\dotnet\shared
Could not resolve assembly: System.Configuration.ConfigurationManager, Version=0.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51 in any of the searched directories: C:\Users\apv\.nuget\packages\; C:\Program Files\dotnet\sdk/NuGetFallbackFolder; C:\Program Files\dotnet\shared
GENERIC ERROR: Could not load type 'System.ServiceModel.ServiceContractAttribute' from assembly 'System.ServiceModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
   at System.ModuleHandle.ResolveType(RuntimeModule module, Int32 typeToken, IntPtr* typeInstArgs, Int32 typeInstCount, IntPtr* methodInstArgs, Int32 methodInstCount, ObjectHandleOnStack type)
   at System.ModuleHandle.ResolveTypeHandleInternal(RuntimeModule module, Int32 typeToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext)
   at System.Reflection.RuntimeModule.ResolveType(Int32 metadataToken, Type[] genericTypeArguments, Type[] genericMethodArguments)
   at System.Reflection.CustomAttribute.FilterCustomAttributeRecord(CustomAttributeRecord caRecord, MetadataImport scope, Assembly& lastAptcaOkAssembly, RuntimeModule decoratedModule, MetadataToken decoratedToken, RuntimeType
attributeFilterType, Boolean mustBeInheritable, Object[] attributes, IList derivedAttributes, RuntimeType& attributeType, IRuntimeMethodInfo& ctor, Boolean& ctorHasParameters, Boolean& isVarArg)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType, Boolean mustBeInheritable, IList derivedAttributes)
   at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeType type, RuntimeType caType, Boolean inherit)
   at System.Attribute.GetCustomAttributes(MemberInfo element, Type type, Boolean inherit)
   at System.Attribute.GetCustomAttribute(MemberInfo element, Type attributeType, Boolean inherit)
   at System.Reflection.CustomAttributeExtensions.GetCustomAttribute[T](MemberInfo element)
   at TypeGen.Core.Extensions.TypeExtensions.HasExportAttribute(Type type, IMetadataReader reader) in D:\Google Drive\Projects\type-gen\src\TypeGen\TypeGen.Core\Extensions\TypeExtensions.cs:line 26
   at System.Linq.Utilities.<>c__DisplayClass1_0`1.<CombinePredicates>b__0(TSource x)
   at System.Linq.Enumerable.WhereArrayIterator`1.MoveNext()
   at TypeGen.Core.Generator.Services.GenerationSpecProvider.GetGenerationSpec(IEnumerable`1 assemblies) in D:\Google Drive\Projects\type-gen\src\TypeGen\TypeGen.Core\Generator\Services\GenerationSpecProvider.cs:line 28
   at TypeGen.Core.Generator.Generator.Generate(IEnumerable`1 assemblies) in D:\Google Drive\Projects\type-gen\src\TypeGen\TypeGen.Core\Generator\Generator.cs:line 305
   at TypeGen.Cli.Program.Generate(String projectFolder, String configPath) in D:\Google Drive\Projects\type-gen\src\TypeGen\TypeGen.Cli\Program.cs:line 137
   at TypeGen.Cli.Program.Main(String[] args) in D:\Google Drive\Projects\type-gen\src\TypeGen\TypeGen.Cli\Program.cs:line 70

I don’t know why it’s trying to resolve all of those Version=0.0.0.0 packages, first of all. I searched my solution for them, and I can’t find any such dependency. I even have the following reference in my .csproj

<PackageReference Include="System.Configuration.ConfigurationManager" Version="4.5.0" />

The biggest problem is the final error, which totally kills the script though. could not load type. That System.ServiceModel.ServiceContract is building just fine, so I don’t know why the typegen script is choking on it 🤷‍♂

[Aaron-Pool]

Nevermind, once I realized that, I was able to figure out the problem myself. For anyone in the future using this, if you’re getting an error about a assembly not being found, make sure it’s not coming from GAC, and, if it is, add

"externalAssemblyPaths": [
    "C:/windows/Microsoft.Net/assembly"
]

And you’ll be good 👍

Thanks again for your help @jburzynski !

[jburzynski]

No problem, glad I could help with something 😃 I’m happy it got resolved and you managed to find a solution, and thanks for posting it!