Nlog: Problem With Loading File Or Assembly from NuGet (mixing .NET framework and . NET Core)

[mjviana]

Hi,
I'm currently unable to use version 4.6.7 of NLog.
Steps to replicate issue:
Create 2 projects in Visual studio
Project B targets .net standard 2.0 and is using version 4.6.7 of NLog added through nuget.
Project A targets .net framework 4.7.2, references project B and tries to use a class from project B that uses NLog.

Results in the following error:

However, if i manually had the reference to project B using the NLog.dll at "C:\Users\User.nuget\packages\nlog\4.6.7\lib\netstandard2.0" then it works without issue.

Current NLog config C#

```C#
public class LogService : ILogService
{
private static Logger logger = LogManager.GetLogger("Log");

    public LogService()
    {
        // Step 1. Create configuration object 
        var config = new NLog.Config.LoggingConfiguration();

        // Step 2. Create targets
        var fileTarget = new NLog.Targets.FileTarget("Target1")
        {
            Layout = "${longdate} Level: ${level:upperCase=true} Message: ${message} ${exception}",
            FileName = "C:\\Logs\\Log.txt",
            CreateDirs = true,
        };
        config.AddTarget(fileTarget);

        // Step 3. Define rules
        config.AddRule(LogLevel.Debug, LogLevel.Fatal, fileTarget);

        // Step 4. Activate the configuration
        LogManager.Configuration = config;
    }

    public void WriteDebugMessage(string message)
    {
        logger.Debug(message);
    }

    public void WriteErrorMessage(string message)
    {
        logger.Error(message);
    }

    public void WriteInfoMessage(string message)
    {
        logger.Info(message);
    }
}

```

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[304NotModified]

What happens if you call NLog (no need to add NLog as project reference) in your start project?

[snakefoot]

When mixing NetFramework with NetCore-projects then one should make sure to use this in the NetFramework-csproj:

<RestoreProjectStyle>PackageReference</RestoreProjectStyle>

See also: https://www.hanselman.com/blog/ReferencingNETStandardAssembliesFromBothNETCoreAndNETFramework.aspx

[mjviana]

When mixing NetFramework with NetCore-projects then one should make sure to use this in the NetFramework-csproj:

<RestoreProjectStyle>PackageReference</RestoreProjectStyle>

See also: https://www.hanselman.com/blog/ReferencingNETStandardAssembliesFromBothNETCoreAndNETFramework.aspx

Thank you! This solved the problem :)