I can't use auto-complete

[NucleonRabbit]

Environment data

dotnet --info output:

Version: 5.0.202
Commit: db7cc87d51

运行时环境:
OS Name: fedora
OS Version: 34
OS Platform: Linux
RID: fedora.34-x64
Base Path: /usr/lib64/dotnet/sdk/5.0.202/

Host (useful for support):
Version: 5.0.5
Commit: 2f740adc14

.NET SDKs installed:
5.0.202 [/usr/lib64/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 5.0.5 [/usr/lib64/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 5.0.5 [/usr/lib64/dotnet/shared/Microsoft.NETCore.App]

VS Code version:
C# Extension version:
v1.23.11

OmniSharp log

Starting OmniSharp server at 2021/5/10上午3:11:54
Target: /home/nucleon14/Project/SSMGWebsite/SSMGWebsite.sln

Razor dev mode active. Suppressing built-in OmniSharp Razor support.

OmniSharp server started.
Path: /home/nucleon14/.vscode/extensions/ms-dotnettools.csharp-1.23.11/.omnisharp/1.37.9-beta.62/run
PID: 20745

Starting OmniSharp on fedora 34.0 (x64)
info: OmniSharp.Services.DotNetCliService
DotNetPath set to dotnet
info: OmniSharp.MSBuild.Discovery.MSBuildLocator
Located 1 MSBuild instance(s)
1: StandAlone 16.10.0 - "/home/nucleon14/.vscode/extensions/ms-dotnettools.csharp-1.23.11/.omnisharp/1.37.9-beta.62/omnisharp/.msbuild/Current/Bin"
info: OmniSharp.MSBuild.Discovery.MSBuildLocator
MSBUILD_EXE_PATH environment variable set to '/home/nucleon14/.vscode/extensions/ms-dotnettools.csharp-1.23.11/.omnisharp/1.37.9-beta.62/omnisharp/.msbuild/Current/Bin/MSBuild.exe'
info: OmniSharp.MSBuild.Discovery.MSBuildLocator
Registered MSBuild instance: StandAlone 16.10.0 - "/home/nucleon14/.vscode/extensions/ms-dotnettools.csharp-1.23.11/.omnisharp/1.37.9-beta.62/omnisharp/.msbuild/Current/Bin"
CscToolExe = csc.exe
MSBuildToolsPath = /home/nucleon14/.vscode/extensions/ms-dotnettools.csharp-1.23.11/.omnisharp/1.37.9-beta.62/omnisharp/.msbuild/Current/Bin
CscToolPath = /home/nucleon14/.vscode/extensions/ms-dotnettools.csharp-1.23.11/.omnisharp/1.37.9-beta.62/omnisharp/.msbuild/Current/Bin/Roslyn
BypassFrameworkInstallChecks = true
MSBuildExtensionsPath = /home/nucleon14/.vscode/extensions/ms-dotnettools.csharp-1.23.11/.omnisharp/1.37.9-beta.62/omnisharp/.msbuild
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 '/home/nucleon14/Project/SSMGWebsite'.
info: OmniSharp.Cake.CakeProjectSystem
Could not find any Cake files
info: OmniSharp.MSBuild.ProjectSystem
Detecting projects in '/home/nucleon14/Project/SSMGWebsite/SSMGWebsite.sln'.
info: OmniSharp.MSBuild.ProjectManager
Queue project update for '/home/nucleon14/Project/SSMGWebsite/SSMGWebsite/SSMGWebsite.csproj'
info: OmniSharp.Script.ScriptProjectSystem
Detecting CSX files in '/home/nucleon14/Project/SSMGWebsite'.
info: OmniSharp.Script.ScriptProjectSystem
Could not find any CSX files
info: OmniSharp.WorkspaceInitializer
Configuration finished.
info: OmniSharp.Stdio.Host
Omnisharp server running using Stdio at location '/home/nucleon14/Project/SSMGWebsite' on host 15599.
info: OmniSharp.MSBuild.ProjectManager
Loading project: /home/nucleon14/Project/SSMGWebsite/SSMGWebsite/SSMGWebsite.csproj
fail: OmniSharp.MSBuild.ProjectLoader
The "Microsoft.AspNetCore.Razor.Tasks.DiscoverDefaultScopedCssItems" task could not be loaded from the assembly /usr/lib64/dotnet/sdk/5.0.202/Sdks/Microsoft.NET.Sdk.Razor/build/netstandard2.0/../../tasks/net46/Microsoft.NET.Sdk.Razor.Tasks.dll. Invalid Image Confirm that the declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask.
[warn]: OmniSharp.MSBuild.ProjectManager
Failed to load project file '/home/nucleon14/Project/SSMGWebsite/SSMGWebsite/SSMGWebsite.csproj'.
/home/nucleon14/Project/SSMGWebsite/SSMGWebsite/SSMGWebsite.csproj
/usr/lib64/dotnet/sdk/5.0.202/Sdks/Microsoft.NET.Sdk.Razor/build/netstandard2.0/Microsoft.NET.Sdk.Razor.ScopedCss.targets(118,3): Error: The "Microsoft.AspNetCore.Razor.Tasks.DiscoverDefaultScopedCssItems" task could not be loaded from the assembly /usr/lib64/dotnet/sdk/5.0.202/Sdks/Microsoft.NET.Sdk.Razor/build/netstandard2.0/../../tasks/net46/Microsoft.NET.Sdk.Razor.Tasks.dll. Invalid Image Confirm that the declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask.

Attempted to update project that is not loaded: /home/nucleon14/Project/SSMGWebsite/SSMGWebsite/SSMGWebsite.csproj

Steps to reproduce

Open an ASP.NET CORE project, Errors gets thrown from Vscode

Expected behavior

can use auto-complete

Actual behavior

can't use auto-complete

[jcmordan]

Same issue:

.NET SDK (reflecting any global.json):
 Version:   5.0.202
 Commit:    db7cc87d51

Runtime Environment:
 OS Name:     fedora
 OS Version:  34
 OS Platform: Linux
 RID:         fedora.34-x64
 Base Path:   /usr/lib64/dotnet/sdk/5.0.202/

Host (useful for support):
  Version: 5.0.5
  Commit:  2f740adc14

.NET SDKs installed:
  5.0.202 [/usr/lib64/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 5.0.5 [/usr/lib64/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 5.0.5 [/usr/lib64/dotnet/shared/Microsoft.NETCore.App]

[JoeRobich]

The issue here is that the source build version of the SDK is installed. There is a known issue that they do not include the Full Framework assemblies in the source build release of the SDK (see dotnet/source-build#2006).

There are different packages you can install. For Arch users there is the dotnet-sdk-bin package. For Fedora or CentOS users, you can try this suggestion #4360 (comment)

[JoeRobich]

Duplicate of #4360