.NET 7 Preview 7 + VS Code = No Intellsense or analysis

Issue Description

When using .NET Preview 7, Omnisharp correctly picks the preview sdk, but then errors with:

Failure while loading the analyzer reference 'Microsoft.CodeAnalysis.CSharp.CodeStyle': Could not load file or assembly 'Microsoft.CodeAnalysis, Version=4.4.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. The system cannot find the file specified. VS.net works fine.

Steps to Reproduce

Install latest .net 7 preview 7. Create a console app: dotnet new console -o whatever Open in VScode Add some code.

Check the output logs for Omnisharp.

Expected Behavior

Should work as normal

Actual Behavior

No intellisense

Logs

OmniSharp log

Starting OmniSharp server at 9/9/2022, 2:05:14 PM Target: d:\Repos\pltfrmd\pltfrmd.sln

OmniSharp server started with .NET 7.0.100-preview.7.22377.5 . Path: c:\Users\jrlh.vscode\extensions\ms-dotnettools.csharp-1.25.0-win32-x64.omnisharp\1.39.0-net6.0\OmniSharp.dll PID: 49200

    Starting OmniSharp on Windows 10.0.22621.0 (x64)

    Checking the 'DOTNET_ROOT' environment variable to find a .NET SDK

    Using the 'dotnet' on the PATH.

    DotNetPath set to dotnet

    Located 4 MSBuild instance(s)
        1: .NET Core SDK 7.0.100 17.4.0 - "C:\Program Files\dotnet\sdk\7.0.100-preview.7.22377.5\"
        2: .NET Core SDK 6.0.400 17.3.0 - "C:\Program Files\dotnet\sdk\6.0.400\"
        3: .NET Core SDK 6.0.302 17.2.0 - "C:\Program Files\dotnet\sdk\6.0.302\"
        4: .NET Core SDK 6.0.301 17.2.0 - "C:\Program Files\dotnet\sdk\6.0.301\"

    Registered MSBuild instance: .NET Core SDK 7.0.100 17.4.0 - "C:\Program Files\dotnet\sdk\7.0.100-preview.7.22377.5\"

    Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpFormattingWorkspaceOptionsProvider, Order: 0

    Detecting projects in 'd:\Repos\xxx\yyyy.sln'.

##Queue project updates### 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\xxx’ on host 47872. ###Loading, success, add for every project### info: OmniSharp.MSBuild.ProjectManager Update project: Auth info: OmniSharp.MSBuild.ProjectManager Update project: Contacts info: OmniSharp.MSBuild.ProjectManager Update project: Reports info: OmniSharp.MSBuild.ProjectManager Update project: Shared info: OmniSharp.MSBuild.ProjectManager Update project: Shared.Server info: OmniSharp.MSBuild.ProjectManager Update project: RavenDb.Repository info: OmniSharp.MSBuild.ProjectManager Update project: Data.RavenDb info: OmniSharp.MSBuild.ProjectManager Update project: Dtos info: OmniSharp.MSBuild.ProjectManager Update project: Localizations info: OmniSharp.Roslyn.CSharp.Services.Diagnostics.CSharpDiagnosticWorkerWithAnalyzers Solution initialized -> queue all documents for code analysis. Initial document count: 174. [fail]: OmniSharp.MSBuild.ProjectManager Failure while loading the analyzer reference ‘Microsoft.CodeAnalysis.CodeStyle’: Could not load file or assembly ‘Microsoft.CodeAnalysis, Version=4.4.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’. The system cannot find the file specified. [fail]: OmniSharp.MSBuild.ProjectManager

C# log

No logs, it never kicks it off.

Environment information

VSCode version: 1.71.0 C# Extension: 1.25.0

Dotnet Information

.NET SDK: Version: 7.0.100-preview.7.22377.5 Commit: ba310d9309

Runtime Environment: OS Name: Windows OS Version: 10.0.22621 OS Platform: Windows RID: win10-x64 Base Path: C:\Program Files\dotnet\sdk\7.0.100-preview.7.22377.5\

Host: Version: 7.0.0-preview.7.22375.6 Architecture: x64 Commit: eecb028078

.NET SDKs installed: 6.0.301 [C:\Program Files\dotnet\sdk] 6.0.302 [C:\Program Files\dotnet\sdk] 6.0.400 [C:\Program Files\dotnet\sdk] 7.0.100-preview.7.22377.5 [C:\Program Files\dotnet\sdk]

.NET runtimes installed: Microsoft.AspNetCore.App 6.0.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 6.0.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.AspNetCore.App 7.0.0-preview.7.22376.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App] Microsoft.NETCore.App 6.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 6.0.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.NETCore.App 7.0.0-preview.7.22375.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App] Microsoft.WindowsDesktop.App 6.0.5 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 6.0.6 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 6.0.7 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 6.0.8 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App] Microsoft.WindowsDesktop.App 7.0.0-preview.7.22377.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found: x86 [C:\Program Files (x86)\dotnet] registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables: Not set

global.json file: Not found

Learn more: https://aka.ms/dotnet/info

Download .NET: https://aka.ms/dotnet/download

Visual Studio Code Extensions

Extension	Author	Version
angular-essentials	johnpapa	13.0.0
angular-schematics	cyrilletuzi	5.2.6
Angular2	johnpapa	13.0.0
azure-account	ms-vscode	0.11.1
azurecli	ms-vscode	0.5.0
c-sharp-utilities	revrenlove	1.4.0
csharp	ms-dotnettools	1.25.0
docomment	k–kato	0.1.31
dotnet	formulahendry	0.0.4
dotnet-test-explorer	formulahendry	0.7.7
EditorConfig	EditorConfig	0.16.4
git-autoconfig	shyykoserhiy	0.0.2
githistory	donjayamanne	0.6.19
go	golang	0.35.2
intellicode-api-usage-examples	VisualStudioExptTeam	0.2.2
jupyter	ms-toolsai	2022.8.1002431955
jupyter-keymap	ms-toolsai	1.0.0
jupyter-renderers	ms-toolsai	1.0.9
material-icon-theme	PKief	4.20.0
msbuild-project-tools	tintoy	0.4.9
ngrok-for-vscode	philnash	1.10.0
prettier-vscode	esbenp	9.8.0
python	ms-python	2022.14.0
remote-containers	ms-vscode-remote	0.251.0
remote-ssh	ms-vscode-remote	0.84.0
remote-ssh-edit	ms-vscode-remote	0.80.0
remote-wsl	ms-vscode-remote	0.66.3
resxpress	PrateekMahendrakar	4.8.0
se-csproj-extensions	selcukermaya	0.0.7
user-secrets	adrianwilczynski	2.0.1
visual-nuget	fullstackspider	0.2.1
vscode-aks-tools	ms-kubernetes-tools	1.3.4
vscode-docker	ms-azuretools	1.22.1
vscode-edge-devtools	ms-edgedevtools	2.1.1
vscode-eslint	dbaeumer	2.2.6
vscode-firefox-debug	firefox-devtools	2.9.8
vscode-kubernetes-tools	ms-kubernetes-tools	1.3.10
vscode-npm-script	eg2	0.3.28
vscode-pull-request-github	GitHub	0.50.0
vscode-pylance	ms-python	2022.9.10
vscode-resx-editor	DominicVonk	0.0.5
vscode-versionlens	pflannery	1.0.10
vscode-yaml	redhat	1.10.1
vscodeintellicode	VisualStudioExptTeam	1.2.25
vscodeintellicode-completions	VisualStudioExptTeam	1.0.18
winteriscoming	johnpapa	1.4.4
xml	DotJoshJohnson	2.5.1

[rodyvansambeek]

This is because the current version of Omnisharp v1.25.0 has no support for Roslyn (Microsoft.CodeAnalysis) Version=4.4.0. It supports up to 4.3.0, if you look at the changelog for the 1.25.1-beta1 version here you will see this beta version supports Roslyn 4.4.0, so installing this beta version will fix your problem.

To install a beta version use this manual from the wiki.

Hope this helps.

[BritoAlv]

I have the latest version of the C# extension, and versions 6.0.400, and 7.0.100 but VSCode doesn’t work when I load a Net6.0 project, Why is that?