.net 5,使用路由，显示找到了多个接受所有给定参数类型的构造函数。应该只有一个适用的构造函数

Question

 app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller=Menu}/{action=Index}/{id?}");
            });
//然后我的MenuController中只有一个Index的action

一运行，程序就会进入路由的部分，然后报错
InvalidOperationException: Multiple constructors accepting all given argument types have been found in type 'PesitcideWMS.Controllers.MenuController'. There should only be one applicable constructor.
Microsoft.Extensions.DependencyInjection.ActivatorUtilities.TryFindMatchingConstructor(Type instanceType, Type[] argumentTypes, ref ConstructorInfo matchingConstructor, ref Nullable[] parameterMap)

这是MenuController

using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using PesitcideWMS.Domain.Entity;
using PesitcideWMS.Models;
using PesitcideWMS.Utils;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;

namespace PesitcideWMS.Controllers
{
    [Authorize]
    public class MenuController : Controller
    {
        private readonly ILogger<MenuController> _logger;
        private readonly CoreDbContext _CoreDbContext;
        
        public MenuController(ILogger<MenuController> logger)
        {
            _logger = logger;
        }
        public MenuController(CoreDbContext CoreDbContext)
        {
            _CoreDbContext = CoreDbContext;
        }
        //public async Task<IActionResult> InitView()
        //{
        //    ViewBag.menu_tree = await _CoreDbContext.MenuView.ToListAsync();
        //    return View();
        //}
        public IActionResult Index()
        {
            ViewBag.shouye = "/Home/Index";

            return View();
        }
        [HttpPost]
        public ActionResult<string> GetLeftNavAsync()
        {
            List<MenuView> allValue = new List<MenuView>();
            allValue = _CoreDbContext.MenuView.ToList();
            List<TreeJsonModel> a = Tree.GetTreeJson(allValue);
            return JsonConvert.SerializeObject(a);
        }


        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult Error()
        {
            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
        }
    }
}

Answer 1

错误信息很明确提示你了你请求的MenuController里面有多个构造函数，只允许有一个构造函数。

    public class MenuController : Controller
    {
        private readonly ILogger<MenuController> _logger;
        private readonly CoreDbContext _CoreDbContext;
        
        public MenuController(ILogger<MenuController> logger,CoreDbContext CoreDbContext)
        {
            _logger = logger;
           _CoreDbContext = CoreDbContext;
        }
     }