[fail]: OmniSharp.MSBuild.ProjectLoader Unable to create directory "obj\Debug\netcoreapp3.1\RazorDeclaration\**\". Illegal characters

[JDillon522]

Issue Description

My intellesense suddenly stopped working over the weekend with zero change to my dev environment (that I know of).

Steps to Reproduce

Unsure.

Expected Behavior

Intelleisense and code completion work.

Actual Behavior

Its little different from working in a vim.

Logs

The main error log seems to be this:

Unable to create directory "obj\Debug\netcoreapp3.1\RazorDeclaration**". Illegal characters

OmniSharp log

Starting OmniSharp server at 1/27/2020, 2:08:40 PM Target: c:\Users\userName\Desktop\Work\Project\ProjectSpa\ProjectApp.sln

OmniSharp server started.
Path: C:\Users\userName.vscode\extensions\ms-vscode.csharp-1.21.9.omnisharp\1.34.9\OmniSharp.exe
PID: 5228

Starting OmniSharp on Windows 6.2.9200.0 (x64)
info: OmniSharp.Services.DotNetCliService
DotNetPath set to dotnet
info: OmniSharp.MSBuild.Discovery.MSBuildLocator
Located 1 MSBuild instance(s)
1: StandAlone 16.3 - "C:\Users\userName.vscode\extensions\ms-vscode.csharp-1.21.9.omnisharp\1.34.9.msbuild\Current\Bin"
info: OmniSharp.MSBuild.Discovery.MSBuildLocator
MSBUILD_EXE_PATH environment variable set to 'C:\Users\userName.vscode\extensions\ms-vscode.csharp-1.21.9.omnisharp\1.34.9.msbuild\Current\Bin\MSBuild.exe'
info: OmniSharp.MSBuild.Discovery.MSBuildLocator
Registered MSBuild instance: StandAlone 16.3 - "C:\Users\userName.vscode\extensions\ms-vscode.csharp-1.21.9.omnisharp\1.34.9.msbuild\Current\Bin"
CscToolExe = csc.exe
CscToolPath = C:\Users\userName.vscode\extensions\ms-vscode.csharp-1.21.9.omnisharp\1.34.9.msbuild\Current\Bin\Roslyn
MSBuildExtensionsPath = C:\Users\userName.vscode\extensions\ms-vscode.csharp-1.21.9.omnisharp\1.34.9.msbuild
MSBuildToolsPath = C:\Users\userName.vscode\extensions\ms-vscode.csharp-1.21.9.omnisharp\1.34.9.msbuild\Current\Bin
info: OmniSharp.Cake.CakeProjectSystem
Detecting Cake files in 'c:\Users\userName\Desktop\Work\Project\ProjectSpa'.
info: OmniSharp.Cake.CakeProjectSystem
Could not find any Cake files
info: OmniSharp.MSBuild.ProjectSystem
Detecting projects in 'c:\Users\userName\Desktop\Work\Project\ProjectSpa\ProjectApp.sln'.
info: OmniSharp.MSBuild.ProjectManager
Queue project update for 'c:\Users\userName\Desktop\Work\Project\ProjectSpa\ProjectApp.csproj'
info: OmniSharp.Script.ScriptProjectSystem
Detecting CSX files in 'c:\Users\userName\Desktop\Work\Project\ProjectSpa'.
info: OmniSharp.Script.ScriptProjectSystem
Could not find any CSX files
info: OmniSharp.MSBuild.ProjectManager
Loading project: c:\Users\userName\Desktop\Work\Project\ProjectSpa\ProjectApp.csproj
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.RenameWorkspaceOptionsProvider, Order: 100
info: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.EditorConfigWorkspaceOptionsProvider, Order: 200
info: OmniSharp.WorkspaceInitializer
Configuration finished.
info: OmniSharp.Stdio.Host
Omnisharp server running using Stdio at location 'c:\Users\userName\Desktop\Work\Project\ProjectSpa' on host 13432.
fail: OmniSharp.MSBuild.ProjectLoader
Unable to create directory "obj\Debug\netcoreapp3.1\RazorDeclaration*". Illegal characters in path.
[warn]: OmniSharp.MSBuild.ProjectManager
Failed to load project file 'c:\Users\userName\Desktop\Work\Project\ProjectSpa\ProjectApp.csproj'.
c:\Users\userName\Desktop\Work\Project\ProjectSpa\ProjectApp.csproj
C:\Program Files\dotnet\sdk\3.1.101\Sdks\Microsoft.NET.Sdk.Razor\build\netstandard2.0\Microsoft.NET.Sdk.Razor.Component.targets(97,5): Error: Unable to create directory "obj\Debug\netcoreapp3.1\RazorDeclaration*". Illegal characters in path.

Attempted to update project that is not loaded: c:\Users\userName\Desktop\Work\Project\ProjectSpa\ProjectApp.csproj

C# log

Post the output from Output-->C# here

Environment information

VSCode version: 1.41.1
C# Extension: 1.21.9

Dotnet Information

.NET Core SDK (reflecting any global.json): Version: 3.1.101 Commit: b377529961

Runtime Environment:
OS Name: Windows
OS Version: 10.0.17763
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\3.1.101\

Host (useful for support):
Version: 3.1.1
Commit: a1388f194c

.NET Core SDKs installed:
3.1.101 [C:\Program Files\dotnet\sdk]

.NET Core runtimes installed:
Microsoft.AspNetCore.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

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

Visual Studio Code Extensions

Extension	Author	Version
Angular-BeastCode	Mikael	8.1.2
azure-account	ms-vscode	0.8.8
azure-pipelines	ms-azure-devops	1.165.1
code-spell-checker	streetsidesoftware	1.7.22
csharp	ms-vscode	1.21.9
Csharp-ASPNETCore	rahulsahay	1.11.0
debugger-for-chrome	msjsdiag	4.12.6
gitlens	eamodio	10.2.0
JavaScriptSnippets	xabikos	1.7.2
msbuild-project-tools	tintoy	0.3.3
mssql	ms-mssql	1.8.0
rainbow-csv	mechatroner	1.5.0
razor-plus	austincummings	0.1.4
team	ms-vsts	1.161.0
vscode-azureappservice	ms-azuretools	0.16.2
vscode-eslint	dbaeumer	2.0.15
vscode-icons	vscode-icons-team	9.7.0
vscode-npm-script	eg2	0.3.10
vscode-nuget-package-manager	jmrog	1.1.6
vscode-scss-formatter	sibiraj-s	1.4.3
vscode-test-explorer	hbenl	2.15.0
vscode-typescript-tslint-plugin	ms-vscode	1.2.3
vscode-yaml	redhat	0.6.1
xml	DotJoshJohnson	2.5.0

[JoeRobich]

@NTaylorMullen Is this a folder that you maintain?

[NTaylorMullen]

@NTaylorMullen Is this a folder that you maintain?

Ya it is at our SDK layer. I'd imagine this would rear its head via dotnet build as well.

@JDillon522 does this happen when you dotnet build? Would you mind sharing a simple repro app?

[JDillon522]

@NTaylorMullen I'm not sure. I can check.

I discovered the root issue was the MAX_PATH variable as seen here:
dotnet/msbuild#53

and I think this is related:
dotnet/msbuild#406

I have an angular project inside my .NET Core app and I like to logically nest my components even if they nest very deep. That nesting in addition to the fact that my project root started a few directories deep meant I hit that MAX_PATH quickly. I fixed it by moving my whole project to C://project_root

Annoying. I tried to ignore the whole ClientApp directory but it didnt work. I did restructure my whole solution to have the ClientApp in a separate project at the same level as the api project but it broke my deployment pipeline and I haven't taken the time to fix it.

[NTaylorMullen]

Thanks for following up @JDillon522. Max path issues can definitely stink in windows development. I feel your pain!