What is Configuration in ASP.NET Core? See Example

Configuration in ASP.NET Core allows developers to manage application settings in a structured way. It supports multiple sources like JSON files, environment variables, command-line arguments, and user secrets. Configuration is essential for flexible and environment-specific setups.

Key Features:

• Centralized management of app settings
• Supports JSON, XML, environment variables, and command-line arguments
• Enables environment-specific configurations
• Integrates with dependency injection
• Supports strongly typed configuration objects

Example:
Reading values from appsettings.json:

{
  "AppSettings": {
    "AppName": "My ASP.NET Core App",
    "Version": "1.0"
  }
}

Injecting configuration in a controller:

public class HomeController : Controller
{
    private readonly IConfiguration _config;
    public HomeController(IConfiguration config)
    {
        _config = config;
    }

    public IActionResult Index()
    {
        var appName = _config["AppSettings:AppName"];
        return Content($"Application Name: {appName}");
    }
}

Configuration in ASP.NET Core makes apps flexible, maintainable, and easy to manage across environments.

Citations:

• Learn more on Savanka
• Official ASP.NET Core Documentation