如何在 layout.html 中添加搜索栏，以便在 controller 中处理？

Question

I am trying to make the search accessible from anywhere in the application and processed by the usual method of action in the controller. I really need your help.

the method of action in the "Home" controller:

public IActionResult Index(string searchTerm)
{
    return View((!string.IsNullOrEmpty(searchTerm))
        ? repository.Products.Where(
            c => c.Name.ToLower().Contains(searchTerm.ToLower())).ToList()
        : RedirectToAction(nameof(ManList)));
}

Going deeper, I'm trying to pass the string searchTerm to layout to use it in (this is how it works in the Index view), but I have no idea how to do it

Answer 1

You can use the ViewData dictionary for this.

ViewData["searchTerm"] = searchTerm;

//Then reference this anywhere in the cshtml

@ViewData["searchTerm"]

Answer 2

If you want to pass data from controller to view, You can use ViewData["xx"] , ViewBag.xx or TempData["xx"] .

You can refer to this link to learn more about how use them and the different between them.

Answer 3

You can use asp.net core ViewComponent to solve this problem. A view component has its own view and backend logic and can be invoked anywhere from the application eg controllers or views.

You can have a better idea about how view components work by following the article: View components in ASP.NET Core