使用此命名空间

Microsoft.EntityFrameworkCore

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你可以参考这个例子。为像我这样的NOOBS。

using ApiApp.Data;
using ApiApp.Entities;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;

namespace ApiApp.Controllers
{
    [ApiController]
    [Route("api/[controller]")]
    public class UserController : ControllerBase
    {
        private readonly DataContext _context;

        public UserController(DataContext context)
        {
            _context = context;
        }

        [HttpGet]
        public async Task<ActionResult<IEnumerable<AppUser>>> GetUsers()
        {
            var users = await _context.Users.ToListAsync();
            return users;
        }

        [HttpGet("{id}")]
        public async Task<ActionResult<AppUser>> GetUser(int id)
        {
            return await _context.Users.FindAsync(id);
        }
    }

}

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