CounterType Enumeration and System.Diagnostics.PerformanceData namespace not implemented

[mderoy]

https://msdn.microsoft.com/en-us/library/bb156214(v=vs.110).aspx not implemented

Steps to Reproduce

1. Compile this code with visual studio

using System;
using System.Collections.Generic;
using System.Diagnostics.PerformanceData;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TypeloadRepro
{
    class Program
    {
        static void Main(string[] args)
        {
            CounterType f = CounterType.AverageCount64;
            Console.WriteLine(f);
        }
    }
}

2. Run, notices the output

AverageCount64

3. Try compiling with mono. This type should be in System.Core

C:\Users\UnityAdmin\source\repos\TypeloadRepro\TypeloadRepro>"C:\Program Files\Mono\bin\mcs" /reference:System.Core.dll Program.cs
Program.cs(3,26): error CS0234: The type or namespace name `PerformanceData' does not exist in the namespace `System.Diagnostics'. Are you missin
Compilation failed: 1 error(s), 0 warnings

4. Try running what was compiled with visual studio and you get a TypeLoadException

Unhandled Exception:
System.TypeLoadException: Could not resolve type with token 01000011 (from typeref, class/assembly System.Diagnostics.PerformanceData.CounterType, System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089)
[ERROR] FATAL UNHANDLED EXCEPTION: System.TypeLoadException: Could not resolve type with token 01000011 (from typeref, class/assembly System.Diagnostics.PerformanceData.CounterType, System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089)

Current Behavior

Mono will not compile this code, and libraries/executables built using this type throw TypeLoadException

Expected Behavior

Mono will compile this, and not raise TypeLoadExceptions when libraries/executables use this

On which platforms did you notice this

[ ] macOS
[ ] Linux
[ x] Windows

Version Used:

C:\Users\UnityAdmin\source\repos\EventProviderTraceListenerRepro\EventProviderTraceListenerRepro>"C:\Program Files\Mono\bin\mono.exe" --version
Mono JIT compiler version 5.10.0 (Visual Studio built mono)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
        TLS:           normal
        SIGSEGV:       normal
        Notification:  Thread + polling
        Architecture:  amd64
        Disabled:      none
        Misc:          softdebug
        Interpreter:   yes
        LLVM:          supported, not enabled.
        GC:            sgen (concurrent by default)

Unity Issue Tracker - https://issuetracker.unity3d.com/issues/unity-fails-to-load-net-4-dot-6-assemblies-with-typeloadexception

[akoeplinger]

would the enum be enough for you or do you need all the classes in System.Diagnostics.PerformanceData ?

[mderoy]

Our user's project is getting a typeload exception on that enum, but I'd prefer we had the api surface of System.Diagnostics.PerformanceData available and throwing NotImplementedException than missing completely in the case users include other libraries built with .NETFW that may include these types.

[akoeplinger]

Ok, feel free to send a PR which adds these stubs :)