BelovApi/BelovAPI/Controllers/UsersConroller.cs

using BelovAPI.BaseConnection;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using BelovAPI.BaseConnection;

namespace BelovAPI.Controllers
{
    [Route("api/[controller]/{name}")]
    [ApiController]
    [ApiExplorerSettings(GroupName = "Действия с пользователем")]
    public class UsersController : ControllerBase
    {
        ApplicationContext db = new ApplicationContext();
        [HttpGet]
        public IActionResult Index(string name) => Ok(db.User.Where(x => x.nameUser.Contains(name)).ToList());
    }
}