Microsoft.XmlSerializer.Generator 2.0.0 - Could not load System.Runtime 4.2.1.0

[EddieDemon]

[EDIT] Investigation Completed.

Two additional issues have been identified from the investigation.
#597
#630

We will leave this issue open and update it as they get fixed.
See down below for a workaround.

---

Hi there!

I'm trying to generate an xml serialization assembly but I keep on stranding with the following:

SGEN : warning SGEN1: Could not load file or assembly 'System.Runtime, Version=4.2.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL'.

I've seen several posts pointing to edit the configuration file of Visual Studio but that was no solution in my case.

I tried both version 1.0.0 and 2.0.0, neither of them work, however version 1.0.0 doesn't generate any specific log output. Both versions end their logging with similar lines;

Assembly '[path to project]\obj\Debug\netcoreapp2.2\library.dll' does not contain any types that can be serialized using XmlSerializer.
1>%USERPROFILE%.nuget\packages\microsoft.xmlserializer.generator\2.0.0\build\Microsoft.XmlSerializer.Generator.targets(16,5): warning : SGEN: Fail to generate the serializer for library.dll. Please follow the instructions at https://go.microsoft.com/fwlink/?linkid=858594 and try again.

Interestingly enough, though, is that I got no issue on another device. This proofs that it is a local issue. I'd still like to be able to use the generator on my main device, what am I missing that this does not work?

[jasantosw]

Hello, I'm having the same SGEN1 warnings building a simple project in VS2019 16.3.1 that targets the netcoreapp2.1 framework and uses version 2.1.0 of the .NET Core Xml Serialization Generator:

1>------ Rebuild All started: Project: ConsoleApp2, Configuration: Debug Any CPU ------
1>ConsoleApp2 -> C:\Users\jasw\source\repos\ConsoleApp2\ConsoleApp2\bin\Debug\netcoreapp2.1\ConsoleApp2.dll
1>[Microsoft (R) .NET Core Xml Serialization Generation Utility, Version 2.1.0]
1>Copyright (C) Microsoft Corporation. All rights reserved.
1>SGEN : warning SGEN1: Could not load file or assembly 'System.Runtime, Version=4.2.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL'.
1>SGEN : warning SGEN1: Could not load file or assembly 'System.Runtime, Version=4.2.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL'.
1>Assembly '[path to project]\obj\Debug\netcoreapp2.1\ConsoleApp2.dll' does not contain any types that can be serialized using XmlSerializer.
1>%USERPROFILE%.nuget\packages\microsoft.xmlserializer.generator\2.1.0\build\Microsoft.XmlSerializer.Generator.targets(38,5): warning : SGEN: Failed to generate the serializer for ConsoleApp2.dll. Please follow the instructions at https://go.microsoft.com/fwlink/?linkid=858594 and try again.
1>Done building project "ConsoleApp2.csproj".
========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========

The project only has a Class1 class with two string properties and a Program class with a Main method that creates an XmlSerializer for Class1. The .csproj file is as follows:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFrameworks>netcoreapp2.1</TargetFrameworks>
  </PropertyGroup>

  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
    <GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
    <IncludeSGenFilesOutputGroup>Off</IncludeSGenFilesOutputGroup>
    <SGenUseProxyTypes>False</SGenUseProxyTypes>
  </PropertyGroup>
  
  <ItemGroup>
    <PackageReference Include="Microsoft.XmlSerializer.Generator" Version="2.1.0" />
  </ItemGroup>

  <ItemGroup>
    <DotNetCliToolReference Include="Microsoft.XmlSerializer.Generator" Version="2.1.0" />
  </ItemGroup>

</Project>

Interestingly, going back to the version 1.0.0 of the package makes the SGEN1 warnings disappear, but it still reports that the assembly does not contain any types that can be serialized using XmlSerializer, and the XmlSerializers assembly is not created. And going back to the netcoreapp2.0 framework, version 1.0.0 of the .NET Core Xml Serialization Generator works ok.

Am I missing something? Is there something I can do to make it work?

Thank you for your help.

[balaji764612]

Hi,
I have been trying this for a week and it doesnt work the way it is specified in https://docs.microsoft.com/en-us/dotnet/core/additional-tools/xml-serializer-generator

I tried the same steps as in the link and still I see the error as described here.

Thanks for your help!

[StephenBonikowsky]

Sorry for the delay in responding to this issue.

We are attempting to reproduce the issues you have described to see if we can get an idea of what might be causing the problems you are seeing.

[mconnew]

I've tracked down the cause of the problem. The good news is there's a temporary workaround until we produce a fixed package. To work around it, you will need to modify the contents of the package. You will need to edit the file "%USERPROFILE%.nuget\packages\microsoft.xmlserializer.generator\2.1.0\lib\netstandard2.0\dotnet-Microsoft.XmlSerializer.Generator.runtimeconfig.json" to replace the tfm and version with the version of .NET Core that you are developing with. For example, if you are developing with .NET Core 2.1, your file would look like this:

{
  "runtimeOptions": {
    "tfm": "netcoreapp2.1",
    "framework": {
      "name": "Microsoft.NETCore.App",
      "version": "2.1.0"
    }
  }
}

If you aren't comfortable with using a modified version of the package, an alternative would be to separate out your data classes into a separate library project which targets netstandard2.0.

We will update this issue when we have published a fixed nuget package.

[balaji764612]

Hi Mat, This resolved the issue. Thanks a lot for your help. regards, Balaji.P

…

On Wed, Nov 27, 2019 at 4:10 AM Matt Connew ***@***.***> wrote: I've tracked down the cause of the problem. The good news is there's a temporary workaround until we produce a fixed package. To work around it, you will need to modify the contents of the package. You will need to edit the file "%USERPROFILE%.nuget\packages\microsoft.xmlserializer.generator\2.1.0\lib\netstandard2.0\dotnet-Microsoft.XmlSerializer.Generator.runtimeconfig.json" to replace the tfm and version with the version of .NET Core that you are developing with. For example, if you are developing with .NET Core 2.1, your file would look like this: { "runtimeOptions": { "tfm": "netcoreapp2.1", "framework": { "name": "Microsoft.NETCore.App", "version": "2.1.0" } } } If you aren't comfortable with using a modified version of the package, an alternative would be to separate out your data classes into a separate library project which targets netstandard2.0. We will update this issue when we have published a fixed nuget package. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <https://github.com/dotnet/corefx/issues/40730?email_source=notifications&email_token=AFUPAL5C5ZURWR6N62OW4XTQVWQU3A5CNFSM4ISTYNAKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEFHVTIA#issuecomment-558848416>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AFUPAL7TM6NHMD5LLZDXM6DQVWQU3ANCNFSM4ISTYNAA> .

[jasantosw]

Thank you Matt. I tried on a separate library project that targets netstandard2.1 and received the following error:

SGEN : warning SGEN1: Could not load file or assembly 'netstandard, Version=2.1.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL'.

Do you have a temporary workaround for this case?

Thanks for your help.

[StephenBonikowsky]

@jasantosw netstandard2.1 isn't supported by netcoreapp2.1. In the workaround that @mconnew provided, change it from netcoreapp2.1 to netcoreapp3.0.

See here for the support table:
https://docs.microsoft.com/en-us/dotnet/standard/net-standard