Unexpected assembly reference conflicts when installing NLog to netstandard2.0 class library

[rohit21agrawal]

From @sandersaares on August 28, 2017 7:53

Details about Problem

NuGet product used: VS UI

NuGet version (x.x.x.xxx): 4.3.0

dotnet.exe --version (if appropriate): N/A

VS version (if appropriate): 15.3.2

OS version (i.e. win10 v1607 (14393.321)): Windows 10 1703 (15063.540)

Worked before? If so, with which NuGet version: unknown

Detailed repro steps so we can see the same problem

1. Create a new .NET Standard 2.0 class library project.
2. Install NLog 5.0.0-beta09
3. Build the project with MSBuild verbosity Detailed.
4. Observe numerous warnings about assembly reference conflicts.

1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\microsoft.win32.registry\4.0.0\runtimes\unix\lib\netstandard1.3\Microsoft.Win32.Registry.dll' and 'Runtime:C:\Users\saares\.nuget\packages\microsoft.win32.registry\4.0.0\runtimes\win\lib\netstandard1.3\Microsoft.Win32.Registry.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.diagnostics.process\4.1.0\runtimes\linux\lib\netstandard1.4\System.Diagnostics.Process.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.diagnostics.process\4.1.0\runtimes\osx\lib\netstandard1.4\System.Diagnostics.Process.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.diagnostics.process\4.1.0\runtimes\linux\lib\netstandard1.4\System.Diagnostics.Process.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.diagnostics.process\4.1.0\runtimes\win\lib\netstandard1.4\System.Diagnostics.Process.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.diagnostics.tracesource\4.0.0\runtimes\unix\lib\netstandard1.3\System.Diagnostics.TraceSource.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.diagnostics.tracesource\4.0.0\runtimes\win\lib\netstandard1.3\System.Diagnostics.TraceSource.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.globalization.extensions\4.0.1\runtimes\unix\lib\netstandard1.3\System.Globalization.Extensions.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.globalization.extensions\4.0.1\runtimes\win\lib\netstandard1.3\System.Globalization.Extensions.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.io.filesystem.accesscontrol\4.0.0\runtimes\unix\lib\netstandard1.3\System.IO.FileSystem.AccessControl.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.io.filesystem.accesscontrol\4.0.0\runtimes\win\lib\netstandard1.3\System.IO.FileSystem.AccessControl.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.io.filesystem.watcher\4.0.0\runtimes\linux\lib\netstandard1.3\System.IO.FileSystem.Watcher.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.io.filesystem.watcher\4.0.0\runtimes\osx\lib\netstandard1.3\System.IO.FileSystem.Watcher.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.io.filesystem.watcher\4.0.0\runtimes\linux\lib\netstandard1.3\System.IO.FileSystem.Watcher.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.io.filesystem.watcher\4.0.0\runtimes\win\lib\netstandard1.3\System.IO.FileSystem.Watcher.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.net.http\4.1.0\runtimes\unix\lib\netstandard1.6\System.Net.Http.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.net.http\4.1.0\runtimes\win\lib\netstandard1.3\System.Net.Http.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.net.nameresolution\4.0.0\runtimes\unix\lib\netstandard1.3\System.Net.NameResolution.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.net.nameresolution\4.0.0\runtimes\win\lib\netstandard1.3\System.Net.NameResolution.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.net.requests\4.0.11\runtimes\unix\lib\netstandard1.3\System.Net.Requests.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.net.requests\4.0.11\runtimes\win\lib\netstandard1.3\System.Net.Requests.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.security.accesscontrol\4.0.0\runtimes\unix\lib\netstandard1.3\System.Security.AccessControl.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.security.accesscontrol\4.0.0\runtimes\win\lib\netstandard1.3\System.Security.AccessControl.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.security.cryptography.algorithms\4.2.0\runtimes\unix\lib\netstandard1.6\System.Security.Cryptography.Algorithms.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.security.cryptography.algorithms\4.2.0\runtimes\win\lib\netstandard1.6\System.Security.Cryptography.Algorithms.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.security.cryptography.cng\4.2.0\runtimes\unix\lib\netstandard1.6\System.Security.Cryptography.Cng.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.security.cryptography.cng\4.2.0\runtimes\win\lib\netstandard1.6\System.Security.Cryptography.Cng.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.security.cryptography.csp\4.0.0\runtimes\unix\lib\netstandard1.3\System.Security.Cryptography.Csp.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.security.cryptography.csp\4.0.0\runtimes\win\lib\netstandard1.3\System.Security.Cryptography.Csp.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.security.cryptography.encoding\4.0.0\runtimes\unix\lib\netstandard1.3\System.Security.Cryptography.Encoding.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.security.cryptography.encoding\4.0.0\runtimes\win\lib\netstandard1.3\System.Security.Cryptography.Encoding.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.security.cryptography.openssl\4.0.0\lib\netstandard1.6\System.Security.Cryptography.OpenSsl.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.security.cryptography.openssl\4.0.0\runtimes\unix\lib\netstandard1.6\System.Security.Cryptography.OpenSsl.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.security.cryptography.x509certificates\4.1.0\runtimes\unix\lib\netstandard1.6\System.Security.Cryptography.X509Certificates.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.security.cryptography.x509certificates\4.1.0\runtimes\win\lib\netstandard1.6\System.Security.Cryptography.X509Certificates.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.security.principal.windows\4.0.0\runtimes\unix\lib\netstandard1.3\System.Security.Principal.Windows.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.security.principal.windows\4.0.0\runtimes\win\lib\netstandard1.3\System.Security.Principal.Windows.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.threading.accesscontrol\4.0.0\runtimes\unix\lib\netstandard1.3\System.Threading.AccessControl.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.threading.accesscontrol\4.0.0\runtimes\win\lib\netstandard1.3\System.Threading.AccessControl.dll'.  Could not determine winner due to equal file and assembly versions.
1>    Encountered conflict between 'Runtime:C:\Users\saares\.nuget\packages\system.threading.overlapped\4.0.1\runtimes\unix\lib\netstandard1.3\System.Threading.Overlapped.dll' and 'Runtime:C:\Users\saares\.nuget\packages\system.threading.overlapped\4.0.1\runtimes\win\lib\netstandard1.3\System.Threading.Overlapped.dll'.  Could not determine winner due to equal file and assembly versions.

The conflicts are unexpected because:

• The project targets .NET Standard 2.0.
• The NLog package targets .NET Standard 1.5.
• Yet the conflicts talk about various different netstandard versions! 1.3, 1.4, 1.6 are all represented there for no obvious reason (to me).
• The conflicts also reference files under "osx" and "unix" directories which is entirely unexpected to me, given that I am on Windows.

For reference, here is the dependency set from NLog nuspec for the latest .NET Standard version it targets:

<group targetFramework=".NETStandard1.5">
        <dependency id="NETStandard.Library" version="[1.6.0, )" />
        <dependency id="Microsoft.Extensions.PlatformAbstractions" version="[1.0.0, )" />
        <dependency id="System.Collections.NonGeneric" version="[4.0.1, )" />
        <dependency id="System.ComponentModel.TypeConverter" version="[4.1.0, )" />
        <dependency id="System.Data.Common" version="[4.1.0, )" />
        <dependency id="System.Diagnostics.Contracts" version="[4.0.1, )" />
        <dependency id="System.Diagnostics.Process" version="[4.1.0, )" />
        <dependency id="System.Diagnostics.StackTrace" version="[4.0.1, )" />
        <dependency id="System.Diagnostics.TraceSource" version="[4.0.0, )" />
        <dependency id="System.IO.FileSystem.Watcher" version="[4.0.0, )" />
        <dependency id="System.IO.FileSystem.AccessControl" version="[4.0.0, )" />
        <dependency id="System.Net.Requests" version="[4.0.11, )" />
        <dependency id="System.Reflection.TypeExtensions" version="[4.1.0, )" />
        <dependency id="System.Runtime.Loader" version="[4.0.0, )" />
        <dependency id="System.Runtime.Serialization.Primitives" version="[4.1.1, )" />
        <dependency id="System.Threading" version="[4.0.11, )" />
        <dependency id="System.Threading.Thread" version="[4.0.0, )" />
        <dependency id="System.Threading.ThreadPool" version="[4.0.10, )" />
        <dependency id="System.Xml.ReaderWriter" version="[4.0.11, )" />
        <dependency id="System.Xml.XmlDocument" version="[4.0.1, )" />
        <dependency id="System.Net.NameResolution" version="[4.0.0, )" />
        <dependency id="System.Security.AccessControl" version="[4.0.0, )" />
        <dependency id="System.Security.Principal" version="[4.0.1, )" />
        <dependency id="System.Threading.AccessControl" version="[4.0.0, )" />
      </group>

Sample Project

Very helpful if you can zip a project and paste into this issue!

ClassLibrary2.zip

Copied from original issue: NuGet/Home#5813

[nguerrera]

cc @ericstj @dsplaisted

[ericstj]

@dsplaisted this is essentially the same as #1510.

[livarcocc]

Closing as a dup of #1510. Also, tried to repro it with the latest CLI and I got no warnings.