Binaries using YamlDotNet built with the "Trim unused code" option fail at runtime

[RobotsOnDrugs]

Describe the bug
Trimmed binaries fail to deserialize and throw an exception at runtime.

To Reproduce
Publish a project with the "Trim unused code" option.
Build log:

Build started...
1>------ Build started: Project: Project, Configuration: Release x64 ------
1>Project -> C:\Users\iamtheclaw\source\repos\Project\bin\x64\Release\net7.0-windows10.0.19041.0\Project.dll
2>------ Publish started: Project: Project, Configuration: Release x64 ------
2>Determining projects to restore...
2>Restored C:\Users\iamtheclaw\source\repos\Project\Project.csproj (in 829 ms).
2>C:\Program Files\Microsoft Visual Studio\2022\Preview\MSBuild\Current\Bin\Roslyn\csc.exe /noconfig /unsafe+ /checked- /nowarn:RCS1001,RCS1003,1701,1702,IL2121,1701,1702,2008 /fullpaths /nostdlib+ /platform:x64 /errorreport:prompt /warn:9999 /define:TRACE;RELEASE;NET;NET7_0;NETCOREAPP;WINDOWS;WINDOWS10_0_19041_0;NET5_0_OR_GREATER;NET6_0_OR_GREATER;NET7_0_OR_GREATER;NETCOREAPP1_0_OR_GREATER;NETCOREAPP1_1_OR_GREATER;NETCOREAPP2_0_OR_GREATER;NETCOREAPP2_1_OR_GREATER;NETCOREAPP2_2_OR_GREATER;NETCOREAPP3_0_OR_GREATER;NETCOREAPP3_1_OR_GREATER;WINDOWS10_0_19041_0_OR_GREATER;WINDOWS10_0_19041_0_OR_GREATER;WINDOWS10_0_18362_0_OR_GREATER;WINDOWS10_0_18362_0_OR_GREATER;WINDOWS10_0_17763_0_OR_GREATER;WINDOWS10_0_17763_0_OR_GREATER;WINDOWS8_0_OR_GREATER;WINDOWS7_0_OR_GREATER /main:Project.Project /errorendlocation /preferreduilang:en-US /highentropyva+ /nullable:enable <other references omitted> /reference:C:\Users\iamtheclaw\.nuget\packages\yamldotnet\12.1.0\lib\net6.0\YamlDotNet.dll /debug- /debug:embedded /filealign:512 /optimize+ /out:obj\x64\Release\net7.0-windows10.0.19041.0\win-x64\Project.dll /refout:obj\x64\Release\net7.0-windows10.0.19041.0\win-x64\refint\Project.dll /target:exe /warnaserror- /utf8output /deterministic+ /langversion:11.0 /analyzerconfig:C:\Users\iamtheclaw\source\repos\Project\.editorconfig /analyzerconfig:obj\x64\Release\net7.0-windows10.0.19041.0\win-x64\Project.GeneratedMSBuildEditorConfig.editorconfig /analyzer:"C:\Program Files\dotnet\sdk\7.0.100\Sdks\Microsoft.NET.Sdk\targets\..\analyzers\Microsoft.CodeAnalysis.CSharp.NetAnalyzers.dll" /analyzer:"C:\Program Files\dotnet\sdk\7.0.100\Sdks\Microsoft.NET.Sdk\targets\..\analyzers\Microsoft.CodeAnalysis.NetAnalyzers.dll" /analyzer:"C:\Program Files\dotnet\sdk\7.0.100\Sdks\Microsoft.NET.Sdk\targets\..\analyzers\ILLink.CodeFixProvider.dll" /analyzer:"C:\Program Files\dotnet\sdk\7.0.100\Sdks\Microsoft.NET.Sdk\targets\..\analyzers\ILLink.RoslynAnalyzer.dll" /analyzer:"C:\Program Files\dotnet\sdk\7.0.100\Sdks\Microsoft.NET.Sdk\targets\..\codestyle\cs\Microsoft.CodeAnalysis.CodeStyle.dll" /analyzer:"C:\Program Files\dotnet\sdk\7.0.100\Sdks\Microsoft.NET.Sdk\targets\..\codestyle\cs\Microsoft.CodeAnalysis.CodeStyle.Fixes.dll" /analyzer:"C:\Program Files\dotnet\sdk\7.0.100\Sdks\Microsoft.NET.Sdk\targets\..\codestyle\cs\Microsoft.CodeAnalysis.CSharp.CodeStyle.dll" /analyzer:"C:\Program Files\dotnet\sdk\7.0.100\Sdks\Microsoft.NET.Sdk\targets\..\codestyle\cs\Microsoft.CodeAnalysis.CSharp.CodeStyle.Fixes.dll" /analyzer:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\7.0.0\analyzers/dotnet/cs/Microsoft.Interop.JavaScript.JSImportGenerator.dll" /analyzer:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\7.0.0\analyzers/dotnet/cs/Microsoft.Interop.LibraryImportGenerator.dll" /analyzer:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\7.0.0\analyzers/dotnet/cs/Microsoft.Interop.SourceGeneration.dll" /analyzer:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\7.0.0\analyzers/dotnet/cs/System.Text.Json.SourceGeneration.dll" /analyzer:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\7.0.0\analyzers/dotnet/cs/System.Text.RegularExpressions.Generator.dll" Project.cs Configuration.cs PathMapping.cs UtilityFunctions.cs obj\x64\Release\net7.0-windows10.0.19041.0\win-x64\Project.GlobalUsings.g.cs "obj\x64\Release\net7.0-windows10.0.19041.0\win-x64\.NETCoreApp,Version=v7.0.AssemblyAttributes.cs" obj\x64\Release\net7.0-windows10.0.19041.0\win-x64\Project.AssemblyInfo.cs /warnaserror+:NU1605,SYSLIB0011
2>Project -> C:\Users\iamtheclaw\source\repos\Project\bin\x64\Release\net7.0-windows10.0.19041.0\win-x64\Project.dll
2>Optimizing assemblies for size. This process might take a while.
2>C:\Program Files\dotnet\dotnet.exe "C:\Program Files\dotnet\sdk\7.0.100\Sdks\Microsoft.NET.ILLink.Tasks\tools\net7.0\illink.dll" -a "obj\x64\Release\net7.0-windows10.0.19041.0\win-x64\Project.dll"
2>--singlewarn
2>--trim-mode link
2>--action link
2>-reference "C:\Users\iamtheclaw\.nuget\packages\fluentftp\42.1.0\lib\net6.0\FluentFTP.dll"
2>-reference "C:\Users\iamtheclaw\.nuget\packages\microsoft.extensions.logging.abstractions\2.1.0\lib\netstandard2.0\Microsoft.Extensions.Logging.Abstractions.dll"
2>-reference "C:\Users\iamtheclaw\.nuget\packages\nlog\5.1.0\lib\netstandard2.0\NLog.dll"
2>-reference "C:\Users\iamtheclaw\.nuget\packages\shellprogressbar\5.2.0\lib\netstandard2.0\ShellProgressBar.dll"
2>-reference "C:\Users\iamtheclaw\.nuget\packages\yamldotnet\12.1.0\lib\net6.0\YamlDotNet.dll"
<other references omitted>
2>--singlewarn- "Project"
2>-out "obj\x64\Release\net7.0-windows10.0.19041.0\win-x64\linked"
2>--nowarn "RCS1001;RCS1003;1701;1702;IL2121;1701;1702;2008"
2>--warn "5"
2>--warnaserror- --warnaserror ";NU1605;SYSLIB0011"
2>--feature Microsoft.Extensions.DependencyInjection.VerifyOpenGenericServiceTrimmability true
2>--feature System.ComponentModel.TypeConverter.EnableUnsafeBinaryFormatterInDesigntimeLicenseContextSerialization false
2>--feature System.Reflection.Metadata.MetadataUpdater.IsSupported false
2>--feature System.Resources.ResourceManager.AllowCustomResourceTypes false
2>--feature System.Runtime.InteropServices.BuiltInComInterop.IsSupported false
2>--feature System.Runtime.InteropServices.EnableConsumingManagedCodeFromNativeHosting false
2>--feature System.Runtime.InteropServices.EnableCppCLIHostActivation false
2>--feature System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization false
2>--feature System.StartupHookProvider.IsSupported false
2>--feature System.Threading.Thread.EnableAutoreleasePool false
2>--feature System.Text.Encoding.EnableUnsafeUTF7Encoding false
2>-b
2>--skip-unresolved true 
2>
2>Assembly 'FluentFTP' produced trim warnings. For more information see https://aka.ms/dotnet-illink/libraries
2>Assembly 'NLog' produced trim warnings. For more information see https://aka.ms/dotnet-illink/libraries
2>Assembly 'YamlDotNet' produced trim warnings. For more information see https://aka.ms/dotnet-illink/libraries
2>Project -> C:\Users\iamtheclaw\source\repos\Project\bin\x64\Release\net7.0-windows10.0.19041.0\publish\win-x64\
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
========== Elapsed 00:18.268 ==========
========== Publish: 1 succeeded, 0 failed, 0 skipped ==========
========== Elapsed 00:18.268 ==========

> Build started at 00:08 and took 17.358 seconds

Exception thrown at runtime:

[2022-12-06 00:14:35.9673] Error:    at YamlDotNet.Serialization.NodeDeserializers.ObjectNodeDeserializer.YamlDotNet.Serialization.INodeDeserializer.Deserialize(IParser, Type, Func`3 , Object& )
   at YamlDotNet.Serialization.ValueDeserializers.NodeValueDeserializer.DeserializeValue(IParser, Type, SerializerState, IValueDeserializer)
   at YamlDotNet.Serialization.ValueDeserializers.AliasValueDeserializer.DeserializeValue(IParser, Type, SerializerState, IValueDeserializer)
   at YamlDotNet.Serialization.Deserializer.Deserialize(IParser, Type)
   at YamlDotNet.Serialization.Deserializer.Deserialize[T](IParser)
   at YamlDotNet.Serialization.Deserializer.Deserialize[T](TextReader)
   at YamlDotNet.Serialization.Deserializer.Deserialize[T](String)
   at Project.Project.Main() in C:\Users\iamtheclaw\source\repos\Project\Project.cs:line 38
[2022-12-06 00:14:35.9985] Error: Property 'GamePath' not found on type 'Project.Configuration+UserConfiguration'.
[2022-12-06 00:14:35.9985] Error: Could not load configuration file. Aborting.
Press any key to exit.

And in case it matters:
Relevant source code lines from my project:

StreamReader reader = File.OpenText("UserConfiguration.yaml");
string ReadAndDispose(StreamReader reader) { string yaml = reader.ReadToEnd(); reader.Dispose(); return yaml; }
_config = new Deserializer().Deserialize<UserConfiguration>(ReadAndDispose(reader));

The object definition:

public record Configuration
{
	public readonly record struct RepoConnectionInfo
	{
		public required string Address { get; init; }
		public required string Username { get; init; }
		public string EffectivePassword => Password ?? Encoding.UTF8.GetString(Convert.FromBase64String(PasswordB64 ?? ""));
		public required string? Password { get; init; }
		public required string? PasswordB64 { get; init; }
		public required int Port { get; init; }
		public required string RootPath { get; init; }
		public required int MaxConnections { get; init; }
	}
	public readonly record struct UserConfiguration
	{
		public required string GamePath { get; init; }
		public required RepoConnectionInfo ConnectionInfo { get; init; }
		public required bool PromptToContinue { get; init; }
		public required string[] BaseSideloaderDirectories { get; init; }
	}
}

And the yaml it reads:

GamePath: C:\Game
ConnectionInfo:
  Address: <omitted>
  Username: <omitted>
  Password: null
  PasswordB64: <omitted>
  Port: 2121
  RootPath: /AI/
  MaxConnections: 5
PromptToContinue: true
BaseSideloaderDirectories:
# All searches are recursive
# relative remote directory | relative local directory | delete files that don't exist in the repo
- mods/Sideloader Modpack | mods\Sideloader Modpack | true
- mods/Sideloader Modpack - Maps | mods\Sideloader Modpack - Maps | true
- mods/Sideloader Modpack - MaterialEditor Shaders | mods\Sideloader Modpack - MaterialEditor Shaders | true
- mods/Sideloader Modpack - Studio | mods\Sideloader Modpack - Studio | true
- mods/SideloaderModpack-BleedingEdge | mods\Sideloader Modpack - Bleeding Edge | true
- mods/SideloaderModpack-UncensorSelector | mods\Sideloader Modpack - Uncensor Selector | true

Untrimmed binaries from the same source code do not throw this exception and read the yaml just fine.

[EdwardCooke]

This is a duplicate of #740. We make heavy use of reflection which doesn’t work well with trimmed libraries. The reason being, is that the compiler doesn’t know that all properties/constructors/methods/etc are being used so it strips them out. I’ve found a few attributes we can add to the code to support it, just haven’t had time to work on it lately. I have the constructor working, just need to work on the properties now.

[RobotsOnDrugs]

Ah, okay. I'll watch that issue. It's much appreciated that supporting and taking advantage of features in newer versions of .NET and other things is important for the project.

[EdwardCooke]

I'm going to close this issue since we're tracking it in #740.