Intellisense fails to load in VS Code

[vedanshumandvikar]

Environment data

dotnet --info output:
.NET Command Line Tools (1.0.0-preview2-003133)

Product Information:
Version: 1.0.0-preview2-003133
Commit SHA-1 hash: 74df06500c

Runtime Environment:
OS Name: Windows
OS Version: 6.2.9200
OS Platform: Windows
RID: win8-x64

VS Code version:1.7.1
C# Extension version:1.5.1

Steps to reproduce

I am trying to develop a web Api solution using .NET cor and VS code. There was an update to C# extension which I installed today. Post update, I get following error while trying to load the intellisense. I have tried increasing the projectloadtimeout, but it is of no use

OmniSharp: -s c:\aspnetwebapi --hostPID 13824 --stdio DotNet:enablePackageRestore=false --encoding utf-8

Unhandled Exception: System.TypeInitializationException: The type initializer for 'System.Diagnostics.DiagnosticSourceEventSource' threw an exception. ---> System.MissingMethodException: Method not found: 'Void System.Diagnostics.Tracing.EventSource..ctor(System.Diagnostics.Tracing.EventSourceSettings)'.
at System.Diagnostics.DiagnosticSourceEventSource..ctor()
at System.Diagnostics.DiagnosticSourceEventSource..cctor()
--- End of inner exception stack trace ---
at System.Diagnostics.DiagnosticListener..ctor(String name)
at Microsoft.AspNetCore.Hosting.WebHostBuilder.BuildHostingServices()
at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
at OmniSharp.Program.Main(String[] args) in C:\Projects\omnisharp-roslyn\src\OmniSharp.Host\Program.cs:line 143
at Program.Main(String[] args) in C:\Projects\omnisharp-roslyn\src\OmniSharp\Program.cs:line 21
[ERROR] Error: OmniSharp server load timed out. Use the 'omnisharp.projectLoadTimeout' setting to override the default delay (one minute).

Can you help? I can provide more details if needed

Expected behavior

Intellisense has to load

Actual behavior

Intellisense does not work

[DustinCampbell]

Thanks! I can reproduce this on Windows 8.1 x64 with no Visual Studio installed. I suspect it's a problem with the version of the .NET Framework that's installed.

[DustinCampbell]

Yes, that's the case. OmniSharp requires .NET Framework 4.6 but Windows 8.1 ships with .NET Framework 4.5.1. You can install an updated .NET Framework from here: https://msdn.microsoft.com/en-us/library/5a4x27ek(v=vs.110).aspx.

[gregg-miskelly]

@DustinCampbell do you know if we can either add a diagnostic, or add a .config file which will cause a feature-on-demand dialog to come up?

[DustinCampbell]

I'm not certain, but I'll look into it. Great idea!

[DustinCampbell]

OK. I've updated the downloads for Windows to include this PR on OmniSharp: OmniSharp/omnisharp-roslyn#669. This will display a dialog telling the user to install .NET Framework 4.6 along with a link to download it from.

Note: OmniSharp must require .NET Framework 4.6 because the new MSBuild 15.0 that it uses does.