存储过程参数在DAL ASP.NET MVC w/out EF

Question

编辑：我忘了添加cmd.CommandType = CommandType.StoredProcedure。如果你忘记了这一行，MVC将会像你从未传过参数一样行事。

我有我的数据库中的表，我希望用.NET MVC

DAL代码

public void AddCity(City city) 
    { 
     using (var con = new SqlConnection(cs)) 
     { 
      using (var cmd = new SqlCommand("spInsertCity", con)) 
      { 
       con.Open(); 
       //these are the three properties of the City class 
       cmd.Parameters.AddWithValue("@cityId", city.CityId); 
       cmd.Parameters.AddWithValue("@cityName", city.CityName); 
       cmd.Parameters.AddWithValue("@countryId", city.CountryId); 
       cmd.ExecuteNonQuery(); 
      } 
     } 
    } 

控制器

[HttpGet] 
     public ActionResult Create() 
     { 
      return View(new City()); 
     } 
     [HttpPost] 
     //pass City object, or form? 
     public ActionResult Create(FormCollection form) 
     { 
      City city = new City(); 
      city.CityId = Convert.ToInt32(form["CityId"]); 
      city.CityName = form["CityName"]; 
      city.CountryId = Convert.ToInt32(form["CountryId"]); 
      var dataAccess = new DataAccessLayer(); 
      dataAccess.AddCity(city); 
      return RedirectToAction("Index"); 
     } 
     public ActionResult Index() 
     { 
      var dataAccess = new DataAccessLayer(); 
      var cityList = dataAccess.GetCities(); 
      return View(cityList); 
     } 

查看

@using (Html.BeginForm("Create","City")) { 
    @Html.ValidationSummary(true) 

    <fieldset> 
     <legend>City</legend> 

     <div class="editor-label"> 
      @Html.LabelFor(model => model.CityName) 
     </div> 
     <div class="editor-field"> 
      @Html.EditorFor(model => model.CityName) 
      @Html.ValidationMessageFor(model => model.CityName) 
     </div> 

     <div class="editor-label"> 
      @Html.LabelFor(model => model.CountryId) 
     </div> 
     <div class="editor-field"> 
      @Html.EditorFor(model => model.CountryId) 
      @Html.ValidationMessageFor(model => model.CountryId) 
     </div> 
     <div class="editor-field"> 
      @Html.LabelFor(x => x.CityId) 
     </div> 
     <div class="editor-field"> 
      @Html.EditorFor(model => model.CityId); 
      @Html.ValidationMessageFor(model => model.CityId) 
     </div> 
     <p> 
      <input type="submit" value="Create" /> 
     </p> 
    </fieldset> 

添加一条记录

随着co德我得到一个例外告诉我，@cityId parameter not provided。我打算从应该构成City对象的表单中获取已发布的值并将其传递给DAL。我有几个问题：

1. 为什么模型联编程序不能将文本框值作为存储过程的参数？

2. 在我的DAL中，我应该将参数设置为City对象，我们的三个参数用于数据库表中的三列？

Answer 1

更改FormCollection到一个强类型的物体，像City

public ActionResult Create(City city) 
     { 
      var dataAccess = new DataAccessLayer(); 
      dataAccess.AddCity(city); 

      return RedirectToAction("Index"); 
     }