How to Read AppSettings from a .json File in ASP.NET Core?

Accessing Configuration Data from a JSON File in ASP.NET Core

ASP.NET Core offers a streamlined method for managing application settings using JSON configuration files. This guide details how to effectively load and utilize these settings.

Configuration Loading:

The process begins by creating a ConfigurationBuilder and incorporating the JSON file using AddJsonFile. Finally, build the configuration and store it.

<code class="language-csharp">var builder = new ConfigurationBuilder()
    .AddJsonFile("appsettings.json");
var configuration = builder.Build();</code>

Employing the Options Pattern:

The Options pattern provides a structured way to access individual settings.

<code class="language-csharp">public class MySettings
{
    public string Token { get; set; }
}</code>

<code class="language-csharp">// Register IOptions<MySettings> with the DI container
services.Configure<MySettings>(configuration.GetSection("AppSettings"));

// Inject IOptions<MySettings> into a controller
public class HomeController : Controller
{
    private readonly IOptions<MySettings> _settings;

    public HomeController(IOptions<MySettings> settings)
    {
        _settings = settings;
    }

    public IActionResult Index()
    {
        return View(_settings.Value);
    }
}</code>

In summary, the Options pattern offers a clean and efficient mechanism for handling and accessing configuration parameters from a JSON file within your ASP.NET Core application.

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