Render .NET Core ASP.NET MVC ViewComponent to string from controller

HomeController.cs

public class HomeController : Controller
{
    public async Task<string> RenderViewComponent(string viewComponent, object args)
    {
        var sp = HttpContext.RequestServices;
            
        var helper = new DefaultViewComponentHelper(
            sp.GetRequiredService<IViewComponentDescriptorCollectionProvider>(),
            HtmlEncoder.Default,
            sp.GetRequiredService<IViewComponentSelector>(),
            sp.GetRequiredService<IViewComponentInvokerFactory>(),
            sp.GetRequiredService<IViewBufferScope>());
        
        using (var writer = new StringWriter())
        {
            var context = new ViewContext(ControllerContext, NullView.Instance, ViewData, TempData, writer, new HtmlHelperOptions());
            helper.Contextualize(context);
            var result = await helper.InvokeAsync(viewComponent, args);
            result.WriteTo(writer, HtmlEncoder.Default);
            await writer.FlushAsync();
            return writer.ToString();
        }
    }
}