Controller action is not invoked in asp.net core - entity-framework-core

Question

I read the book 'Pro Entity Framework Core 2 for ASP.NET MVC'. I'm currently at the beginning of chapter 12 and have some problems. I have this controller:
namespace DataApp.Controllers
{
public class HomeController : Controller
{
private IDataRepository repository;
public HomeController(IDataRepository repo)
{
repository = repo;
}
public IActionResult Index()
{
return View(repository.GetAllProducts());
}
public IActionResult Create()
{
ViewBag.CreateMode = true;
return View("Editor", new Product());
}
[HttpPost]
public IActionResult Create(Product product)
{
repository.CreateProduct(product);
return RedirectToAction(nameof(Index));
}
public IActionResult Edit(long id)
{
ViewBag.CreateMode = false;
return View("Editor", repository.GetProduct(id));
}
[HttpPost]
public IActionResult Edit(Product product)
{
repository.UpdateProduct(product);
return RedirectToAction(nameof(Index));
}
[HttpPost]
public IActionResult Delete(long id)
{
repository.DeleteProduct(id);
return RedirectToAction(nameof(Index));
}
}
}
The index view looks like this:
#model IEnumerable<DataApp.Models.Product>
#{
ViewData["Title"] = "Products";
Layout = "_Layout";
}
<table class="table table-sm table-striped">
<thead>
<tr><th>ID</th><th>Name</th><th>Category</th><th>Price</th></tr>
</thead>
<tbody>
#foreach (var p in Model)
{
<tr>
<td>#p.Id</td>
<td>#p.Name</td>
<td>#p.Category</td>
<td>$#p.Price.ToString("F2")</td>
<td>
<form asp-action="Delete" method="post">
<a asp-action="Edit"
class="btn btn-sm btn-warning" asp-route-id="#p.Id">
Edit
</a>
<input type="hidden" name="id" value="#p.Id" />
<button type="submit" class="btn btn-danger btn-sm">
Delete
</button>
</form>
</td>
</tr>
}
</tbody>
</table>
<a asp-action="Create" class="btn btn-primary">Create New Product</a>
If I run the application and click the Edit or Create button, I don't get the Editor view. If I navigate in the browser to /Home/Edit, then the view is shown. What can be the problem?
You can find the complete source code for this chapter here:
Chapter 2
Please note, that I'm at the beginning of the chapter and the files in the source code may contain more, that I currently have, but according to the book, it should work on this stage too.