我正在使用 VS Code 創建一個 asp.net 項目。這個問題首先被提出是因為我需要使用 AllowAnonymous 操作過濾器。它給出了“ The type or namespace name 'AllowAnonymousAttribute' could not be found.”的錯誤所以我添加了使用 System.Web.Mvc; 在開始部分。它顯示error CS0234: The type or namespace name 'Mvc' does not exist in the namespace 'System.Web'你能給出任何建議嗎？謝謝。using System;using System.Collections.Generic;using System.Linq;using System.Web.Mvc;using System.Threading.Tasks;using Microsoft.AspNetCore.Mvc;using DatingApp.API.Data;using Microsoft.EntityFrameworkCore;namespace DatingApp.API.Controllers{    [AllowAnonymous]    [Route("api/[controller]")]    public class ValuesController : Controller    {        private readonly DataContext _context;        public ValuesController(DataContext context)        {            _context = context;        }        // GET api/values        [HttpGet]        public async Task<IActionResult> GetValues()        {            var values=await _context.Values.ToListAsync();            return Ok(values);        }......運行后dotnet watch run，它給出了如下錯誤。watch : StartedControllers\ValuesController.cs(4,18): error CS0234: The type or namespace name 'Mvc' does not exist in the namespace 'System.Web' (are you missing an assembly reference?) [C:\Xumin\projects\DatingApp\DatingApp.API\DatingApp.API.csproj]Controllers\ValuesController.cs(12,6): error CS0246: The type or namespace name 'AllowAnonymousAttribute' could not be found (are you missing a using directive or an assembly reference?) [C:\Xumin\projects\DatingApp\DatingApp.API\DatingApp.API.csproj]Controllers\ValuesController.cs(12,6): error CS0246: The type or namespace name 'AllowAnonymous' could not be found (are you missing a using directive or an assembly reference?) [C:\Xumin\projects\DatingApp\DatingApp.API\DatingApp.API.csproj]