Support log4net integration on .NET Core

[jonorossi]

This will miss the cut for v4.0 because log4net still doesn't support .NET Core: https://github.com/apache/log4net/pull/16

[mtraudt]

There is now a version of log4net (2.0.6) that targets netstandard1.3: https://www.nuget.org/packages/log4net-core-preview/

[jonorossi]

@mtraudt that package looks to be published by a third party and is not supported by the upstream project.

[iluzyanin]

The official package with .Net core support is there now: https://www.nuget.org/packages/log4net/2.0.6

[jonorossi]

log4net 2.0.7 was released on January 5th to fix the NuGet package dependencies being wrong.

I've attempted to add support for .NET Core with our log4net integration, however I ran into the following problems with the .NET Core build:

• XmlConfigurator.Configure and XmlConfigurator.ConfigureAndWatch now require a log4net.Repository.ILoggerRepository
• LogManager.GetLogger needs a repository name or repository assembly
• LogManager.GetRepository needs a repository name or repository assembly

I ran out of time to implement this myself and I don't use it myself. This issue is already tagged up-for-grabs, so a pull request is welcomed and we can make another release.

If someone wants to pick this up you'll need to add the xproj back to the NetCore solution and edit the project.json for the unit test project to reference the log4net project and remove the file exclusion.

@jonorossi - I can verify this, I ran into the same issues. What are your thoughts on how you want to inject the repository? I cheated with some default repository hack. Would be happy to fish it out and submit a PR for this.

[jonorossi]

What are your thoughts on how you want to inject the repository? I cheated with some default repository hack. Would be happy to fish it out and submit a PR for this.

I really can't remember any of it, happy to review a pull request.

[snakefoot]

Created PR #340