Bits of .NET

The Problem: You changed a value in appsettings.json, but the app keeps using the old value until you restart the server.

The Fix: Inject IOptionsSnapshot<T> instead of IOptions<T>. It reads the config file every time the request is made.

public class MyService
{
    private readonly MySettings _settings;

    // Updates immediately when json changes!
    public MyService(IOptionsSnapshot<MySettings> options) 
    {
        _settings = options.Value;
    }
}