Roslyn: `C# Interactive` is broken in VS16.8 preview5

[yyjdelete]

Version Used:
VS16.8 preview5

🔗 Also reported at AB#1231577

Steps to Reproduce:

1. Open C# Interactive;
2. Output any non-ascii string like ("测试");
3. #reset core(#reset 32 or #reset 64 works well)

Expected Behavior:

1. non-ascii string should be supported;
2. Switch to core runtime without error;

This only happen on one of my PC, not sure what's the difference between them, and FUSLOGVW.exe show nothing for this
See https://github.com/dotnet/roslyn/issues/48874#issuecomment-715654253 instead if not reproducable in your PC for extra steps;

Actual Behavior:

1. Encoding not work
   

1. Failed to load System.IO.Pipelines, Version=4.0.2.1

> #reset core
Resetting execution engine.
Failed to launch 'c:\program files (x86)\microsoft visual studio\2019\preview\common7\ide\commonextensions\microsoft\managedlanguages\vbcsharp\languageservices\InteractiveHost\Core\InteractiveHost64.exe' process (exit code: 1) with output: 
System.IO.FileNotFoundException: Could not load file or assembly 'System.IO.Pipelines, Version=4.0.2.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. ϵͳ�Ҳ���ָ�����ļ���
File name: 'System.IO.Pipelines, Version=4.0.2.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
   at StreamJsonRpc.JsonMessageFormatter..ctor(Encoding encoding)
   at StreamJsonRpc.JsonMessageFormatter..ctor()
   at Microsoft.CodeAnalysis.Interactive.InteractiveHost.CreateRpc(Stream stream, Object incomingCallTarget)
   at Microsoft.CodeAnalysis.Interactive.InteractiveHost.Service.RunServerAsync(String pipeName, Int32 clientProcessId, Func`2 invokeOnMainThread)
   at Microsoft.CodeAnalysis.Interactive.InteractiveHostEntryPoint.Main(String[] args)

Not sure if the 2 error is related.

[huoyaoyuan]

Note: I can reproduce it when system codepage is 936. Cannot reproduce if it's 65001.
FYI: https://github.com/dotnet/runtime/issues/43295#issuecomment-707176857

[yyjdelete]

For the FileNotFoundException, ensure dotnet-sdk-5.0.100-rc.2.20479.15 is installed(already bundled in VS16.8 preview5), and any runtime or sdk of dotnet-5.0.100-rc.1 is completed removed.

Double check and make sure Not exists C:\Program Files\dotnet\host\fxr\5.0.0-rc.1.20451.14\hostfxr.dll and C:\Program Files\dotnet\shared\Microsoft.NETCore.App\5.0.0-rc.1.20451.14

For some unknown reason, when install dotnet-sdk-5.0.100-rc.1.20452.10 and then install 5.0.0-rc2.20489.15 (x64) from Visual Studio(update VS), uninstall dotnet-sdk-5.0.100-rc.1.20452.10 will actual remove nothing from disk

Seems System.IO.Pipelines used to be a part of Microsoft.NETCore.App 5.0.0 rc1, but removed in rc2.

[ufcpp]

I have the same problem in CP 932.

[ahdung]

Any news? 16.8.1 still here

[GF-Huang]

49491

[tmat]

Fixed by https://github.com/dotnet/roslyn/issues/48874.

[GF-Huang]

Issue still exits in VS2019 16.8.3

[huoyaoyuan]

The milestone of fixing PR is 16.9, later than 16.9P2.
It's expected that it's still not fixed in 16.9P2.

[ahdung]

So why not 16.8.x? This is an ugly quality issue.

[CyrusNajmabadi]

So why not 16.8.x?

Because it does not meet the 16.8.x bar. THe fix will be released in 16.9.