49 lines
2.4 KiB
Markdown
49 lines
2.4 KiB
Markdown
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# SGEN crashes trying to load the System.IO.Compression.FileSystem reference assembly
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## Symptoms
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When building an application that uses the [XML Serializer Generator Tool (SGen.exe)](https://docs.microsoft.com/en-us/dotnet/standard/serialization/xml-serializer-generator-tool-sgen-exe), you get an error similar to this one:
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```
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An attempt was made to load an assembly with an incorrect format: C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.1\Facades\System.IO.Compression.ZipFile.dll.
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```
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## Cause
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.NET Framework 4.7.1 includes a few new assemblies in order to support .NET Standard 2.0.
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For those assemblies, we added entries in a .NET Framework unification table to ensure that assemblies with different versions will correctly unify to a single one.
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For the `System.IO.Compression.FileSystem` the information captured in the unification table is incorrect.
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This causes the assembly to not be correctly unified by the .NET Framework and in turn causes SGEN to give out that error.
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## Impact
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This problem occurs when building the applications that use the SGEN tool.
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## Workaround
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Add the following targets to the project that is experiencing this issue.
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The targets remove the reference assemblies from the ReferencePath set that SGEN uses before the serialization assemblies are produced and adds them back after they are produced.
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```xml
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<Target Name="RemoveDesignTimeFacadesBeforeSGen" BeforeTargets="GenerateSerializationAssemblies">
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<ItemGroup>
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<DesignFacadesToFilter Include="System.IO.Compression.ZipFile" />
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<_FilterOutFromReferencePath Include="@(_DesignTimeFacadeAssemblies_Names->'%(OriginalIdentity)')"
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Condition="'@(DesignFacadesToFilter)' == '@(_DesignTimeFacadeAssemblies_Names)' and '%(Identity)' != ''" />
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<ReferencePath Remove="@(_FilterOutFromReferencePath)" />
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</ItemGroup>
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<Message Importance="normal" Text="Removing DesignTimeFacades from ReferencePath before running SGen." /> </Target>
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<Target Name="ReAddDesignTimeFacadesBeforeSGen" AfterTargets="GenerateSerializationAssemblies">
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<ItemGroup>
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<ReferencePath Include="@(_FilterOutFromReferencePath)" />
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</ItemGroup>
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<Message Importance="normal" Text="Adding back DesignTimeFacades from ReferencePath now that SGen has ran." />
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</Target>
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```
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## Resolution
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This problem is fixed in [.NET Framework 4.7.2](http://go.microsoft.com/fwlink/?LinkId=863281).
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