Could not load file or assembly 'Microsoft.Build' on Fedora

[martinellison]

Environment data

dotnet --info output:
~/jigsaw/git/main fixes> dotnet --info

.NET Command Line Tools (2.0.2)

Product Information:
 Version:            2.0.2
 Commit SHA-1 hash:  a04b4bf512

Runtime Environment:
 OS Name:     fedora
 OS Version:  26
 OS Platform: Linux
 RID:         fedora.26-x64
 Base Path:   /usr/share/dotnet/sdk/2.0.2/

Microsoft .NET Core Shared Framework Host

  Version  : 2.0.0
  Build    : e8b8861ac7faf042c87a5c2f9f2d04c98b69f28d

VS Code version:
Version 1.17.2
Commit b813d12980308015bcd2b3a2f6efa5c810c33ba5
Date 2017-10-16T13:57:00.652Z
Shell 1.7.7
Renderer 58.0.3029.110
Node 7.9.0
Architecture x64
C# Extension version:
1.13.0 (November 7, 2017)

Steps to reproduce

Load C# project

uname -a
Linux xiaosan 4.13.10-200.fc26.x86_64 #1 SMP Fri Oct 27 15:34:40 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Expected behavior

OmniSharp works

Actual behavior

OmniSharp does not work at all

System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Build, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies.
File name: 'Microsoft.Build, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
at OmniSharp.MSBuild.MSBuildProjectSystem.LoadProject (System.String projectFilePath) [0x00038] in :0

Notes

• It was working yesterday.
• I have tried the tintoy package but it did not help (same output)

[DustinCampbell]

Hi @martinellison -- you have Mono 5.4 installed into Fedora 26, correct? If so, OmniSharp will attempt to use Mono's msbuild. Unfortunately, that is not included in the mono-complete or mono-devel packages. However, you should be able to install it with sudo yum install msbuild. That should get OmniSharp working again.

Note: The FileNotFoundException for Microsoft.Build was fixed earlier today with OmniSharp/omnisharp-roslyn#1016. That should make its way into a new update to C# for VS Code in the next couple of days.

[martinellison]

sudo dnf install -y msbuild worked thanks

[DustinCampbell]

Great! Thanks!