I found a nice answer on creating breadcrumbs for this project here:

What should be done here?

Should I remove the link for Services and leave the text, or should I have Services route to Home?

I would like to route the root navigation menu items back to Home, but I don't understand enough about this ActionLink.

CodePudding user response：

Here is what I have done until someone posts a better solution:

In the file Global.asax.cs, I added the Application_Error method to redirect when a controller is not found:

protected void Application_Error()
{
    var err = Server.GetLastError();
    if (err.GetType() == typeof(InvalidOperationException))
    {
        if (err.Message.IndexOf("The view 'Index' or its master was not found") == 0)
        {
            if (-1 < err.StackTrace.IndexOf("System.Web.Mvc.ViewResult.FindView(ControllerContext context)"))
            {
                // this controller does not have a view
                var request = HttpContext.Current.Request;
                var homeLink = $"{request.Url.Scheme}://{request.Url.Authority}{request.ApplicationPath.TrimEnd('/')}/";
                Response.Redirect(homeLink);
            }
        }
    }
}

It works, but it just doesn't seem like the way ASP.NET MVC should handle the case of links going to controllers that do not exist.

CodePudding user response：

https://localhost:44383/Services/

It is trying to redirect to default action of ServiceController, which is typically named Index.

I think you have a few options (depending on what you want):

1. Redirect to /Home:

   public class ServiceController : Controller
   {
       // assuming you want to redirect to HomeController's default action:
       public IActionResult Index() => Redirect("/Home");
   
       // or if you know HomeController's default action name,
       // you can use more idiomatic syntax:
       //
       // public IActionResult Index() => RedirectToAction("Index", "Home");
   }
   

2. Utilize this space by adding an action Index page under Services (with list of services).

3. Render Services in breadcrumb as text (instead of link):

   if (controllerName == "Services")
   {
       sb.Append($"<li>{controllerName}</li>");
   }
   else
   {
       var controllerLink = helper.ActionLink(
           linkText: controllerName,
           actionName: "/",
           controllerName: controllerName);
   
       sb.Append($"<li>{controllerLink}</li>");
   }
   

(I'd personally choose option #2 if it's my decision)