場(chǎng)景是; VS2017、MVC 5、StructureMap.MVC5我收到以下錯(cuò)誤：構(gòu)建類型 BLL.MMCodes.MMCodesService 時(shí)出錯(cuò)。" InnerException {"值不能為空。\r\n參數(shù)名稱：字符串"}嘗試運(yùn)行我的應(yīng)用程序時(shí)出現(xiàn)在“DoGetInstance”函數(shù)中。protected override object DoGetInstance(Type serviceType, string key) {        IContainer container = (CurrentNestedContainer ?? Container);        if (string.IsNullOrEmpty(key)) {            return serviceType.IsAbstract || serviceType.IsInterface                ? container.TryGetInstance(serviceType)                : container.GetInstance(serviceType);        }        return container.GetInstance(serviceType, key);    }服務(wù)和接口namespace BLL.MMCodes{    public interface IMMCodesService    {        bool ValidateAgainstBizRules(string MMCode, out string errorMessage);        bool _UseEF        {            get;            set;        }    }public class MMCodesService : IMMCodesService{    private string errorMessage;    public MMCodesService()    {        ValidateAgainstBizRules( MMCode, out errorMessage);    }    #region vars    public string MMCode { get; set; }    private bool IsValid { get; set; }    private List<string> Validations = new List<string>();    #endregion    public  bool _UseEF { get; set; }    public bool ValidateAgainstBizRules(string mmCode, out string errorMessage)    {....}控制器using System.Collections.Generic;using System.Web.Mvc;using BLL.MMCodes;using BusinessLayerDemoProject.Models;namespace BusinessLayerDemoProject.Controllers{    public class MMCodeController : Controller    {        private IMMCodesService _iService;        public MMCodeController(IMMCodesService service)        {            this._iService = service;            this._iService._UseEF = true;        }我已經(jīng)嘗試了來自整個(gè)論壇的幾個(gè)建議，例如。更改中的屬性StructureMapDependencyScope以適應(yīng) HTTPContext 和 CurrentNestedContainer 屬性中的 null，但沒有成功。