NLog.config is not read when application is stored in a drive's root folder

[wilhelmmedetz]

NLog version: 4.7.7
Platform: .Net 4.5

• What is the current result?
  • NLog.config is not read
• What is the expected result?
  • NLog.config should be read
• Did you checked the [Internal log]
  • not applicable
• Please post full exception details (message, stacktrace, inner exceptions)
  • none
• Are there any workarounds? yes/no
  • applicationname.exe.nlog or NLog.dll.nlog works
• Is there a version in which it did work?
  • NLog.4.2.3
• Can you help us by writing an unit test?
  • no

When starting an application from a drive's root directory the NLog.config in the root directory is not read.

Steps to reproduce:

• create a simple console application with a NLog.config
• map the build directory with subst to some drive
  e.g. subst h: C:\...\ConsoleApp\bin\Debug\net452
• start the console application on the mapped drive
• NLog.config is not read

[snakefoot]

I can confirm that it also fails on my machine:

2021-02-24 20:27:21.8316 Debug Loading config from D:NLog.config
2021-02-24 20:27:21.8316 Error Failed loading from config file location: D:NLog.config Exception: System.UriFormatException: Invalid URI: A Dos path must be rooted, for example, 'c:\'.
   at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind)
   at System.Xml.XmlResolver.ResolveUri(Uri baseUri, String relativeUri)
   at System.Xml.XmlTextReaderImpl..ctor(String uriStr, XmlReaderSettings settings, XmlParserContext context, XmlResolver uriResolver)
   at System.Xml.XmlReaderSettings.CreateReader(String inputUri, XmlParserContext inputContext)
   at NLog.Internal.Fakeables.AppEnvironmentWrapper.LoadXmlFile(String path)
   at NLog.Config.LoggingConfigurationFileLoader.LoadXmlLoggingConfigurationFile(LogFactory logFactory, String configFile)
   at NLog.Config.LoggingConfigurationFileLoader.TryLoadLoggingConfiguration(LogFactory logFactory, String configFile, LoggingConfiguration& config)
2021-02-24 20:27:21.8650 Debug Found assembly location directory: 'D:\' (ConsoleApp2, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null)
2021-02-24 20:27:21.8650 Debug Targets not configured for logger: ConsoleApp2.Program

[snakefoot]

Think bug was introduced with #2846 in NLog 4.5.9

[snakefoot]

@wilhelmmedetz Thank you for reporting this issue. Have created #4316 to fix the bug.

[snakefoot]

Resolved by #4316

[snakefoot]

NLog ver. 4.7.8 has been released: https://www.nuget.org/packages/NLog