Do some work after the response in ASP.NET Core

Question

I have an ASP.NET Core website, using EFCore. I would like to do some work like logging to the database, but after having sent the response to the user in order to answer faster

Answer 1

I see this has never been answered, but actually have a solution. The simple solution:

public async Task Request([FromForm]RequestViewModel model, string returnUrl = null)
{
    try 
    {
      var newModel = new ResponseViewModel(model);
      // Some work 
      return View("RequestView",newModel)
    }
    finally
    {
        Response.OnCompleted(async () =>
        {
            // Do some work here
            await Log(model);
        });
    }
}

The secure solution, as OnCompleted used to be called before the response being sent, so delaying the response:

public static void OnCompleted2(this HttpResponse resp, Func callback)
{
    resp.OnCompleted(() =>
    {
        Task.Run(() => { try { callback.Invoke(); } catch {} });
        return Task.CompletedTask;
    });
}

and call Response.OnCompleted2(async () => { /* some async work */ })