Global static object shared across all API Controllers/action methods

Question

I need to expose a singleton shared object across all controllers/action methods in Asp.Net WebAPI. Which is the best place to declare such global static objects so that all co

Answer 1

You can use Lazy. This will ensure thread safety:

public class Greeter
{
    public static readonly Lazy Instance = new Lazy(() => new Greeter());

    public Greeter()
    {
        // I am called once during the applications lifetime
    }

    public string Greet(string name)
    {
        return $"Hello {name}!";
    }
}

Then use this wherever you like:

public class GreetController : ApiController
{
    public IHttpActionResult Get(string name)
    {
        var message = Greeter.Instance.Value.Greet(name);

        return Ok(message);
    }
}