C# 从数据库获取数据并分配它

我已从数据库中分配检索到的数据（

ChancesLeft

），并使用创建的变量分配它。但是当我检查控制器中创建的变量时（已经分配给检索到的数据（

ChancesLeft

）从数据库中，创建变量的值始终为0，即使我已经调用了该检索函数。但是，当我签入检索函数所在的类时，创建变量的值不是0，而是在检索数据的值之后（

ChancesLeft

）

我的问题是，如何将值从类传递给控制器？以便使用它

代码（系统管理器）：

控制器：

 SystemManager _sm = new SystemManager();

 [HttpGet]
    public ActionResult Index()
    {
        return View();
    }

 [HttpPost]
    public ActionResult Index(MyModel context, string Name)
    {
        _sm.RetrieveChancesLeft(Name);

        if (context.Chances > 0)
        {
            return RedirectToAction("About", "Home");
        }

        else
        {
            return RedirectToAction("GetStarted", "Home");
        }
    }

public MyModel RetrieveChancesLeft(string Name)
    {
        MyModel context = new MyModel();

        using (SqlConnection conn = new SqlConnection(connectionString))
        {
            string query = "SELECT [Name], [ChancesLeft] FROM [Credentials] WHERE [Name] = @Name";

            conn.Open();

            using (SqlCommand cmd = new SqlCommand(query, conn))
            {
                cmd.Parameters.Add("@Name", SqlDbType.NVarChar);
                cmd.Parameters["@Name"].Value = Name;

                using (SqlDataReader reader = cmd.ExecuteReader())
                {
                    while (reader.Read())
                    {
                        context.Chances = Convert.ToInt32(reader["ChancesLeft"]);
                    }
                }
            }

            conn.Close();

        }
        return context;

    }

    SystemManager _sm = new SystemManager();

 [HttpGet]
    public ActionResult Index()
    {
        return View();
    }

 [HttpPost]
    public ActionResult Index(MyModel context, string Name)
    {
        context = _sm.RetrieveChancesLeft(Name);

        if (context.Chances > 0)
        {
            return RedirectToAction("About", "Home");
        }

        else
        {
            return RedirectToAction("GetStarted", "Home");
        }
    }

---

问题是，每当我运行程序并输入

名称时，它总是重定向到
GetStarted
视图，这意味着
上下文。尽管数据库中的
ChancesLeft
不是0，但
的几率始终为0。RetrieveChancesLeft函数应该将本地上下文对象存储在用于检索的ystemManager对象或将上下文返回给调用方。您可以更改RetrieveChancesLeft函数的返回类型，以将对象传递给控制器：

 SystemManager _sm = new SystemManager();

 [HttpGet]
    public ActionResult Index()
    {
        return View();
    }

 [HttpPost]
    public ActionResult Index(MyModel context, string Name)
    {
        _sm.RetrieveChancesLeft(Name);

        if (context.Chances > 0)
        {
            return RedirectToAction("About", "Home");
        }

        else
        {
            return RedirectToAction("GetStarted", "Home");
        }
    }

public MyModel RetrieveChancesLeft(string Name)
    {
        MyModel context = new MyModel();

        using (SqlConnection conn = new SqlConnection(connectionString))
        {
            string query = "SELECT [Name], [ChancesLeft] FROM [Credentials] WHERE [Name] = @Name";

            conn.Open();

            using (SqlCommand cmd = new SqlCommand(query, conn))
            {
                cmd.Parameters.Add("@Name", SqlDbType.NVarChar);
                cmd.Parameters["@Name"].Value = Name;

                using (SqlDataReader reader = cmd.ExecuteReader())
                {
                    while (reader.Read())
                    {
                        context.Chances = Convert.ToInt32(reader["ChancesLeft"]);
                    }
                }
            }

            conn.Close();

        }
        return context;

    }

    SystemManager _sm = new SystemManager();

 [HttpGet]
    public ActionResult Index()
    {
        return View();
    }

 [HttpPost]
    public ActionResult Index(MyModel context, string Name)
    {
        context = _sm.RetrieveChancesLeft(Name);

        if (context.Chances > 0)
        {
            return RedirectToAction("About", "Home");
        }

        else
        {
            return RedirectToAction("GetStarted", "Home");
        }
    }

和您的控制器：

 SystemManager _sm = new SystemManager();

 [HttpGet]
    public ActionResult Index()
    {
        return View();
    }

 [HttpPost]
    public ActionResult Index(MyModel context, string Name)
    {
        _sm.RetrieveChancesLeft(Name);

        if (context.Chances > 0)
        {
            return RedirectToAction("About", "Home");
        }

        else
        {
            return RedirectToAction("GetStarted", "Home");
        }
    }

public MyModel RetrieveChancesLeft(string Name)
    {
        MyModel context = new MyModel();

        using (SqlConnection conn = new SqlConnection(connectionString))
        {
            string query = "SELECT [Name], [ChancesLeft] FROM [Credentials] WHERE [Name] = @Name";

            conn.Open();

            using (SqlCommand cmd = new SqlCommand(query, conn))
            {
                cmd.Parameters.Add("@Name", SqlDbType.NVarChar);
                cmd.Parameters["@Name"].Value = Name;

                using (SqlDataReader reader = cmd.ExecuteReader())
                {
                    while (reader.Read())
                    {
                        context.Chances = Convert.ToInt32(reader["ChancesLeft"]);
                    }
                }
            }

            conn.Close();

        }
        return context;

    }

    SystemManager _sm = new SystemManager();

 [HttpGet]
    public ActionResult Index()
    {
        return View();
    }

 [HttpPost]
    public ActionResult Index(MyModel context, string Name)
    {
        context = _sm.RetrieveChancesLeft(Name);

        if (context.Chances > 0)
        {
            return RedirectToAction("About", "Home");
        }

        else
        {
            return RedirectToAction("GetStarted", "Home");
        }
    }