Question

我正在尝试列出数据库中显示的数据，我创建了一个类ViewingGoals并在类中实现其业务逻辑ViewingGoalsBusinessLayer代码如下所示

ViewingGoals.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BusinessLayer
{
  public class ViewingGoals
    {
        public string Goal { get; set; }
    }
}

ViewingGoalsBusinessLayer.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using BusinessLayer;

namespace BusinessLayer
{
    public class ViewingGoalsBusinessLayer
    {
        public void ViewData(ViewingGoals viewgoal)
        {
            try
            {
                string Connectionstring = ConfigurationManager.ConnectionStrings["Connectionstring"].ConnectionString;
                List<ViewingGoals> viewgoals = new List<ViewingGoals>();
                using (SqlConnection con = new SqlConnection(Connectionstring))
                {
                    SqlCommand cmd = new SqlCommand("ViewGoal", con);
                    cmd.CommandType = CommandType.StoredProcedure;
                    con.Open();
                    SqlDataReader rdr = cmd.ExecuteReader();
                    while (rdr.Read())
                    {
                        //ViewingGoals viewgoal = new ViewingGoals();
                        viewgoal.Goal = rdr["Goal"].ToString();
                        viewgoals.Add(viewgoal);
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
    }
}

我的控制器代码是：

ViewingGoalsController.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using BusinessLayer;

namespace AppraisalManagementSystemFinal.Controllers
{
    public class ViewingGoalsController : Controller
    {
        //
        // GET: /ViewingGoals/

        public ActionResult ViewingGoals()
        {
            ViewingGoalsBusinessLayer viewinggoalsbusinessLayer = new ViewingGoalsBusinessLayer();
            List<ViewingGoals> viewgoals = viewinggoalsbusinessLayer.viewgoal.ToList();

            return View(viewgoals);
        }

    }
}

在那个控制器中我试图从ViewingGoalBusinessLayer访问该对象列表viewgoals = viewinggoalsbusinessLayer.viewgoal.ToList（）;我收到错误，因为不包含viewgoal的定义。

请帮助我克服它。

Answer 1

当您使用viewinggoalsbusinessLayer.viewgoal时，您正试图从您的viewinggoalsbusinessLayer对象访问viewgoal属性。
问题是你还没有在那个对象中定义这样的属性！
这是代码的更新部分

public class ViewingGoalsBusinessLayer
    {
        public List<ViewingGoals> ViewGoals;
        public void ViewData(ViewingGoals viewgoal)
        {
            try
            {
                string Connectionstring = ConfigurationManager.ConnectionStrings["Connectionstring"].ConnectionString;
                Viewgoals = new List<ViewingGoals>();
                // Rest of code is unchanged ...
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
    }

接下来的问题是您需要初始化该列表，而且我不确定您的ViewData函数正在做什么...

无法访问模型类中定义的对象

1 个答案: