How Can I Use app.config for Configuration Management in .NET Core?

Configuration Management in .Net Core: Leveraging app.config

In the realm of .Net Core, developers may encounter obstacles when attempting to utilize app.config for configuration management. Let's delve into this issue and explore a solution.

The Problem:

When attempting to access configuration values from app.config in .Net Core using the ConfigurationManager class, exceptions such as "Error Initializing the configuration system" may arise.

The Solution:

To overcome this hurdle, one can employ the CoreCompat.System.Configuration NuGet package (version 4.2.3-r4 -Pre) to enable compatibility with the System.Configuration library in .Net Core. Additionally, for platforms like Linux where .Net Core lacks native support, a test project workaround is necessary to ensure the availability of app.config at runtime.

Using app.config in .Net Core:

1. Create a .Net Standard 2.0 Library (e.g., MyLib.dll).
2. Install the System.Configuration.ConfigurationManager NuGet package (version 4.4.0).
3. Define custom configuration classes derived from ConfigurationSection or ConfigurationElement in MyLib.dll.
4. Create a .Net Core 2.0 app (e.g., MyApp.dll) and an app.config file containing the custom configurations.
5. Ensure the package and assembly names in app.config align with the classes defined in MyLib.dll.

Additional Workaround for Test Projects:

In test projects, app.config may not be utilized by default. To address this, add the following snippet to the .csproj file of the test project:

<Target Name="CopyCustomContent" AfterTargets="AfterBuild">
  <Copy SourceFiles="App.config" DestinationFiles="$(OutDir)\testhost.dll.config" />
</Target>

By following these steps, developers can confidently utilize app.config for configuration management in .Net Core environments, empowering efficient and flexible application development.

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