api-product-controller-with-hal.cs

[RoutePrefix("products")]
public class ProductController
{
  [Route("{productId}")
  public virtual async Product GetProduct(int productId)
  {
    var product = await this._service.GetProductAsync(productId);
  
    product.Rel = "product";
    product.Href = "/products/" + productId;
    product.Links = new List<Link>()
                    {
                      new Link("self", "/products/" + productId),
                      new Link("find", "/products/{productId}"),
                      new Link("collection", "/products"),
                    };
    return product;
  }
}