ASP.net 核心视图不返回值到 controller

Question

What I am trying to achieve is 2 things:

1. send a value I get from an external source (An API) inside my controller for processing. "to check if that ID exists in my database. if not add it" but my issue is that I always get null when I do so. the ID is always empty even though I can view it inside the view. but even with empty id, I should be able to search my database.
2. that's where my second problem comes InvalidOperationException: Unable to resolve service for type 'MoviesDB.Models.ApplicationDbContext' while attempting to activate 'MoviesDB.Controllers.HomeController'.

So in Summary my View never sends my Controller the ID. and I also get this other error when I try to access my database. (this error happens on startup without me even trying to access that part of the functions)

My view is something like that. I'll only post the affected: so what happens here. my list loads exactly as expected and shows everything I need. after I click on Details and Access my controller it will not give me a value. I will explain later in the other block of code

  <tbody>
            @foreach (var item in Model.Search)
            {
                @item.Runtime
                //       each table row is assigned with the imdbID returned from the API. if the user clicks one of the rows
                //then the system will 1st check the database if this movie exist in the database. if not then it will be added and then desplayed
                //if the movie exist then it will be automatically desplayed to the user without making another API call.
                <tr >
                    <td><img src="@item.Poster" class="img-thumbnail" alt="Responsive image" width="200"> </td>
                    <td>@item.Title</td>
                    <td>@item.Year @item.imdbID</td>
                    <td>  <a asp-controller="Home" asp-action="FindMovie" asp-for="@item.imdbID">Details </a> </td>
                </tr>
            }
        </tbody>

So what is happening here once I start up my project I will get that error:

InvalidOperationException: Unable to resolve service for type 'MoviesDB.Models.ApplicationDbContext' while attempting to activate 'MoviesDB.Controllers.HomeController'.

I don't know why this is happening, I will post my services on the next block just in case there is something I am missing in there. well now if I commented out all the database things and just have inside FindMovie action

Console.WriteLine("I am in Find" + imdbID); 

I will only get "I am in Find" but I will not have an id next to it. so as it seems I am not sending the ID

private readonly ApplicationDbContext _db;
[BindProperty]
 public Movies movies { get; set; }
 public HomeController(ApplicationDbContext db)
 {
     _db = db;
}
  
public IActionResult Index()
{
    return View();
}

[HttpGet]
public IActionResult FindMovie()
{
    return View();
}


[HttpPost]

public IActionResult FindMovie(string imdbID)
 {
    Console.WriteLine("I am in Find" + imdbID);
     var item = _db.Movies.Where(s => s.imdbID.Equals(imdbID)).FirstOrDefault();
    if (item != null)
    {
        return NotFound();
    }
   return Content("Id is: {imdbID}");
}

and lastly here are my services:

 services.AddDbContext<ApplicationDbContext>(options =>
        options.UseSqlServer(
            Configuration.GetConnectionString("DefaultConnection")));
    services.AddDefaultIdentity<IdentityUser>(options => options.SignIn.RequireConfirmedAccount = false)
        .AddEntityFrameworkStores<ApplicationDbContext>();
    services.AddControllersWithViews();
    services.AddRazorPages();

Answer 1

I have found what the problem was. When creating a new project with visual studio. if you choose to create Authentication, it will create a dbcontext for you inside a folder called Data. it so happened this file to be called ApplicationDbContext as well. out of coincidence I named it the same.

what I did to resolve the error was to rename my own ApplicationDbContext to something new and add it in services and it worked perfectly. it was a structure error I guess.