Can't read app.config in C# .NET Core unit test project with ConfigurationManager

Question

I\'ve created a simple unit test project to read an app.config file. Target framework is Core 2.0. I also created a Core 2.0 console app, to sanity-check myself to make sure

Answer 1

The ConfigurationManager API will only use the configuration of the app that is currently running. In a unit test project, this means the app.config of the test project, not the console application.

.NET Core Applications aren't supposed to use app.config or ConfigurationManager, as it is a legacy "full framework" configuration system.

Consider using Microsoft.Extensions.Configuration instead to read JSON, XML or INI configuration files. See this doc: https://docs.microsoft.com/en-us/aspnet/core/fundamentals/configuration