OmniSharp does not recognize classes, members, and props generated by CsWin32

[BinToss]

Issue Description

Although the root cause seemed to have been resolved in 2021 by the Roslyn and CsWin32 teams, OmniSharp still doesn't recognize CsWin32's generated code (which works perfectly in Visual Studio IDE).

Steps to Reproduce

dotnet new wpf --langVersion 9 --lang
dotnet add package Microsoft.Windows.CsWin32 --prerelease
New-Item NativeMethods.txt
"DeviceIoControl" > NativeMethods.txt
add using Windows.Win32 and using Microsoft.Win32
Call DeviceIoControl() from App.xaml.cs
dotnet build *.csproj

Build will succeed despite OmniSharp's Error highlights.

Expected Behavior

• unsafe project property is set to true by CsWin32
• CsWin32 symbols are available for use with OmniSharp

Actual Behavior

The type or namespace name 'Windows' could not be found (are you missing a using directive or an assembly reference?) - csharp(CS0246)
Unsafe code may only appear if compiling with /unsafe - csharp(CS0227)
The name 'PInvoke' does not exist in the current context - csharp(CS0103)

Logs

OmniSharp log

Starting OmniSharp server at 2/26/2022, 2:56:02 AM
Target: d:\Repos\HaloSPV3\SPV3.Loader\ext\hxe\src\HXE.sln

OmniSharp server started.
Path: c:\Users\Noah.vscode\extensions\ms-dotnettools.csharp-1.24.0.omnisharp\1.38.0\OmniSharp.exe
PID: 18000

Starting OmniSharp on Windows 6.2.9200.0 (x64)
info: OmniSharp.Services.DotNetCliService
Checking the 'DOTNET_ROOT' environment variable to find a .NET SDK
info: OmniSharp.Services.DotNetCliService
Using the 'dotnet' on the PATH.
info: OmniSharp.Services.DotNetCliService
DotNetPath set to dotnet
info: OmniSharp.MSBuild.Discovery.MSBuildLocator
Located 4 MSBuild instance(s)
1: Visual Studio Community 2022 17.1.32210.238 17.1.0 - "C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin"
2: Visual Studio Community 2019 16.11.32106.194 16.11.2 - "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Current\Bin"
3: Visual Studio Community 2022 17.1.32203.90 17.1.0 - "C:\Program Files\Microsoft Visual Studio\2022\Preview\MSBuild\Current\Bin"
4: StandAlone 17.0.0 - "c:\Users\Noah.vscode\extensions\ms-dotnettools.csharp-1.24.0.omnisharp\1.38.0.msbuild\Current\Bin"
info: OmniSharp.MSBuild.Discovery.MSBuildLocator
Registered MSBuild instance: Visual Studio Community 2022 17.1.32210.238 17.1.0 - "C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin"
info: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpFormattingWorkspaceOptionsProvider, Order: 0
info: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.Completion.CompletionOptionsProvider, Order: 0
info: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.RenameWorkspaceOptionsProvider, Order: 100
info: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.ImplementTypeWorkspaceOptionsProvider, Order: 110
info: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.BlockStructureWorkspaceOptionsProvider, Order: 140
info: OmniSharp.Cake.CakeProjectSystem
Detecting Cake files in 'd:\Repos\HaloSPV3\SPV3.Loader\ext\hxe\src'.
info: OmniSharp.Cake.CakeProjectSystem
Did not find any Cake files
info: OmniSharp.MSBuild.ProjectSystem
Detecting projects in 'd:\Repos\HaloSPV3\SPV3.Loader\ext\hxe\src\HXE.sln'.
info: OmniSharp.MSBuild.ProjectManager
Queue project update for 'd:\Repos\HaloSPV3\SPV3.Loader\ext\hxe\src\HXE.csproj'
info: OmniSharp.Script.ScriptProjectSystem
Detecting CSX files in 'd:\Repos\HaloSPV3\SPV3.Loader\ext\hxe\src'.
info: OmniSharp.Script.ScriptProjectSystem
Did not find any CSX files
info: OmniSharp.WorkspaceInitializer
Configuration finished.
info: OmniSharp.Stdio.Host
Omnisharp server running using Stdio at location 'd:\Repos\HaloSPV3\SPV3.Loader\ext\hxe\src' on host 6880.
info: OmniSharp.MSBuild.ProjectManager
Loading project: d:\Repos\HaloSPV3\SPV3.Loader\ext\hxe\src\HXE.csproj
info: OmniSharp.MSBuild.ProjectManager
Successfully loaded project file 'd:\Repos\HaloSPV3\SPV3.Loader\ext\hxe\src\HXE.csproj'.
info: OmniSharp.MSBuild.ProjectManager
Adding project 'd:\Repos\HaloSPV3\SPV3.Loader\ext\hxe\src\HXE.csproj'
info: OmniSharp.MSBuild.ProjectManager
Update project: HXE
info: OmniSharp.Roslyn.CSharp.Services.Diagnostics.CSharpDiagnosticWorkerWithAnalyzers
Solution initialized -> queue all documents for code analysis. Initial document count: 54.
[warn]: OmniSharp.Roslyn.CSharp.Services.Navigation.FindUsagesService
No symbol found. File: d:\Repos\HaloSPV3\SPV3.Loader\ext\hxe\src\Common\FileSystemCompression.cs, Line: 36, Column: 33.
[warn]: OmniSharp.Roslyn.CSharp.Services.Navigation.FindUsagesService
No symbol found. File: d:\Repos\HaloSPV3\SPV3.Loader\ext\hxe\src\Common\FileSystemCompression.cs, Line: 36, Column: 28.
Received response for /v2/getcodeactions but could not find request.
Received response for /v2/getcodeactions but could not find request.
Received response for /v2/getcodeactions but could not find request.
[warn]: OmniSharp.Stdio.Host
************ Request ************
{
"Type": "request",
"Seq": 295,
"Command": "/v2/getcodeactions",
"Arguments": {
"FileName": "d:\Repos\HaloSPV3\SPV3.Loader\ext\hxe\src\Common\FileSystemCompression.cs",
"Line": 36,
"Column": 28
}
}
[fail]: OmniSharp.Stdio.Host
************ Response (1209.4932ms) ************
{
"Request_seq": 295,
"Command": "/v2/getcodeactions",
"Running": true,
"Success": false,
"Message": ""System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.\r\n at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)\r\n at System.Reflection.RuntimeAssembly.get_DefinedTypes()\r\n at System.Linq.Enumerable.d__172.MoveNext()\\r\\n at System.Linq.Enumerable.WhereSelectEnumerableIterator2.MoveNext()\r\n at System.Linq.Enumerable.WhereEnumerableIterator1.MoveNext()\\r\\n at System.Linq.Enumerable.<ConcatIterator>d__591.MoveNext()\r\n at System.Linq.Buffer1..ctor(IEnumerable1 source)\r\n at System.Linq.Enumerable.ToArray[TSource](IEnumerable1 source)\\r\\n at System.Collections.Immutable.ImmutableArray.CreateRange[T](IEnumerable1 items)\r\n at OmniSharp.Roslyn.CSharp.Services.Refactoring.V2.CachingCodeFixProviderForProjects.LoadFrom(Project project) in D:\\a\\1\\s\\src\\OmniSharp.Roslyn.CSharp\\Services\\Refactoring\\V2\\CachingCodeFixProviderForProjects.cs:line 93\r\n at OmniSharp.Roslyn.CSharp.Services.Refactoring.V2.CachingCodeFixProviderForProjects.GetAllCodeFixesForProject(ProjectId projectId) in D:\\a\\1\\s\\src\\OmniSharp.Roslyn.CSharp\\Services\\Refactoring\\V2\\CachingCodeFixProviderForProjects.cs:line 57\r\n at OmniSharp.Roslyn.CSharp.Services.Refactoring.V2.BaseCodeActionService2.GetSortedCodeFixProviders(Document document) in D:\\\\a\\\\1\\\\s\\\\src\\\\OmniSharp.Roslyn.CSharp\\\\Services\\\\Refactoring\\\\V2\\\\BaseCodeActionService.cs:line 156\\r\\n at OmniSharp.Roslyn.CSharp.Services.Refactoring.V2.BaseCodeActionService2.d__13.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at OmniSharp.Roslyn.CSharp.Services.Refactoring.V2.BaseCodeActionService2.<CollectCodeFixesActions>d__12.MoveNext() in D:\\\\a\\\\1\\\\s\\\\src\\\\OmniSharp.Roslyn.CSharp\\\\Services\\\\Refactoring\\\\V2\\\\BaseCodeActionService.cs:line 123\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\\r\\n at OmniSharp.Roslyn.CSharp.Services.Refactoring.V2.BaseCodeActionService2.d__9.MoveNext() in D:\\a\\1\\s\\src\\OmniSharp.Roslyn.CSharp\\Services\\Refactoring\\V2\\BaseCodeActionService.cs:line 80\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at OmniSharp.Roslyn.CSharp.Services.Refactoring.V2.GetCodeActionsService.d__1.MoveNext() in D:\\a\\1\\s\\src\\OmniSharp.Roslyn.CSharp\\Services\\Refactoring\\V2\\GetCodeActionsService.cs:line 32\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at OmniSharp.Endpoint.EndpointHandler2.<GetFirstNotEmptyResponseFromHandlers>d__19.MoveNext()\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\\r\\n at OmniSharp.Endpoint.EndpointHandler2.d__20.MoveNext() in D:\\a\\1\\s\\src\\OmniSharp.Host\\Endpoint\\EndpointHandler.cs:line 230\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at OmniSharp.Endpoint.EndpointHandler`2.d__16.MoveNext() in D:\\a\\1\\s\\src\\OmniSharp.Host\\Endpoint\\EndpointHandler.cs:line 131\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at OmniSharp.Stdio.Host.d__14.MoveNext() in D:\\a\\1\\s\\src\\OmniSharp.Stdio\\Host.cs:line 218"",
"Body": null,
"Seq": 73,
"Type": "response"
}

C# log

Installing C# dependencies...
Platform: win32, x86_64

Finished

Environment information

VSCode version: 1.64.2
C# Extension: 1.24.0

Dotnet Information

.NET SDK (reflecting any global.json): Version: 6.0.200-preview.22055.15 Commit: a3c3a2bf3b

Runtime Environment:
OS Name: Windows
OS Version: 10.0.19044
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\6.0.200-preview.22055.15\

Host (useful for support):
Version: 6.0.1
Commit: 3a25a7f1cc

.NET SDKs installed:
3.1.416 [C:\Program Files\dotnet\sdk]
5.0.403 [C:\Program Files\dotnet\sdk]
5.0.404 [C:\Program Files\dotnet\sdk]
5.0.405 [C:\Program Files\dotnet\sdk]
6.0.100-rc.2.21505.57 [C:\Program Files\dotnet\sdk]
6.0.101 [C:\Program Files\dotnet\sdk]
6.0.200-preview.22055.15 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
Microsoft.AspNetCore.All 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.21 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.22 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.10 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.14 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.0-rc.2.21480.10 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.21 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.22 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.10 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.14 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.0-rc.2.21480.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.21 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 3.1.22 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.10 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.12 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.13 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.14 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.0-rc.2.21501.6 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET runtimes or SDKs:
https://aka.ms/dotnet-download

Visual Studio Code Extensions

Extension	Author	Version
angelscript	renesackers	1.0.3
auto-using	Fudge	0.7.15
better-cpp-syntax	jeff-hykin	1.15.13
cmake	twxs	0.0.17
cmake-tools	ms-vscode	1.9.2
code-spell-checker	streetsidesoftware	2.1.7
code-stats-vscode	riussi	1.0.18
codespaces	GitHub	1.5.4
cpptools	ms-vscode	1.8.4
cpptools-extension-pack	ms-vscode	1.1.0
cpptools-themes	ms-vscode	1.0.0
csharp	ms-dotnettools	1.24.0
docomment	k--kato	0.1.30
docs-article-templates	docsmsft	0.2.11
docs-images	docsmsft	0.0.9
docs-linting	docsmsft	0.0.9
docs-metadata	docsmsft	1.0.7
docs-preview	docsmsft	0.3.57
docs-visual-areas	docsmsft	0.2.1
docs-yaml	docsmsft	0.2.7
dotnet-interactive-vscode	ms-dotnettools	1.0.3103010
doxdocgen	cschlosser	1.4.0
EditorConfig	EditorConfig	0.16.4
even-better-toml	tamasfe	0.14.2
file-header	bookworms	0.0.1
file-icons	file-icons	1.0.29
file-properties-viewer	brunnerh	1.0.0
gc-excelviewer	GrapeCity	4.0.50
github-markdown-preview	bierner	0.2.0
gitlens	eamodio	11.7.0
hexeditor	ms-vscode	1.9.5
html-css-class-completion	Zignd	1.20.0
java	redhat	1.3.0
jupyter	ms-toolsai	2022.1.1301854968
jupyter-keymap	ms-toolsai	1.0.0
jupyter-renderers	ms-toolsai	1.0.6
LinkCheckMD	blackmist	0.3.1
live-server	ms-vscode	0.2.12
LogFileHighlighter	emilast	2.15.0
makefile-tools	ms-vscode	0.3.1
markdown-checkbox	bierner	0.3.2
markdown-emoji	bierner	0.2.1
markdown-footnotes	bierner	0.0.7
markdown-preview-github-styles	bierner	1.0.1
markdown-yaml-preamble	bierner	0.1.0
msbuild-project-tools	tintoy	0.4.3
msbuild-tools	sterin	0.0.12
npm-intellisense	christian-kohler	1.4.1
nsis	idleberg	3.48.0
nsis-plugins	idleberg	1.3.1
nugetpackagemanagergui	aliasadidev	1.1.9
powershell-preview	ms-vscode	2022.2.2
prettyxml	PrateekMahendrakar	1.4.0
python	ms-python	2022.0.1814523869
qub-msbuild	qub	0.6.3
rainbow-csv	mechatroner	2.0.0
reload	natqe	0.0.6
remote-containers	ms-vscode-remote	0.217.4
remote-ssh	ms-vscode-remote	0.74.0
remote-ssh-edit	ms-vscode-remote	0.74.0
remote-wsl	ms-vscode-remote	0.64.2
remotehub	GitHub	0.24.0
reopenclosedtab	uyiosa-enabulele	1.1.0
roslynator	josefpihrt-vscode	4.0.3
ruby	rebornix	0.28.1
sarif-viewer	MS-SarifVSCode	3.1.1
SecurityIntelliSense	azsdktm	0.8.0
shader	slevesque	1.1.5
solutionextension	Tobias-Sekan	1.9.2
test-adapter-converter	ms-vscode	0.1.5
toml	be5invis	0.6.0
vs-keybindings	ms-vscode	0.2.1
vscode	unoplatform	0.2.5
vscode-cdb	MicrosoftDebuggingPlatform	0.0.6
vscode-codeql	GitHub	1.5.11
vscode-conventional-commits	vivaxy	1.24.0
vscode-detect-charset	yeluoqiuzhi	0.0.1
vscode-devskim	MS-CST-E	0.6.8
vscode-github-actions	cschleiden	0.22.0
vscode-html-css	ecmel	1.11.0
vscode-java-debug	vscjava	0.38.0
vscode-java-dependency	vscjava	0.19.0
vscode-java-pack	vscjava	0.21.0
vscode-java-test	vscjava	0.34.0
vscode-markdown-notebook	ms-vscode	0.0.26
vscode-markdownlint	DavidAnson	0.46.0
vscode-maven	vscjava	0.35.0
vscode-npm-script	eg2	0.3.24
vscode-pull-request-github	GitHub	0.36.2
vscode-pylance	ms-python	2022.2.4
vscode-ruby	wingrunr21	0.28.0
vscode-solution-explorer	fernandoescolar	0.4.5
vscode-test-explorer	hbenl	2.21.1
vscode-typescript-next	ms-vscode	4.7.20220225
vscode-xml	redhat	0.19.1
vscode-xml-complete	rogalmic	0.3.0
vscode-yaml	redhat	1.4.0
vscodeintellicode	VisualStudioExptTeam	1.2.17
xml	DotJoshJohnson	2.5.1

[BinToss]

microsoft/CsWin32#7
This related issue applies to .NET SDK 5. I'm using .NET SDK 6 which has the suggested workaround applied by default.

[nohwnd]

Might be related to how design time build is done.