C# 无法访问@Html.DropDownList值

我是ASP.NETMVC新手，尝试使用viewbag绑定dropdownlist并在controller中访问它，
下面是我的代码

控制器构造函数

 public HomeController()
    {
        List<SelectListItem> list = new List<SelectListItem>();
        list.Add(new SelectListItem { Text="HO", Value="HO" });
        list.Add(new SelectListItem { Text = "BIHAR", Value = "BIHAR" });
        list.Add(new SelectListItem { Text = "CHHATTISGARH", Value = "CHHATTISGARH" });
        list.Add(new SelectListItem { Text = "HARYANA", Value = "HARYANA" });
        list.Add(new SelectListItem { Text = "Madhya PRADESH", Value = "Madhya PRADESH" });
        list.Add(new SelectListItem { Text = "PUNJAB", Value = "PUNJAB" });
        list.Add(new SelectListItem { Text = "RAJASTHAN", Value = "RAJASTHAN" });
        list.Add(new SelectListItem { Text = "UTTAR PRADESH (E)", Value = "UTTAR PRADESH (E)" });
        list.Add(new SelectListItem { Text = "UTTAR PRADESH (W)", Value = "UTTAR PRADESH (W)" });
        list.Add(new SelectListItem { Text = "UTTARAKHAND", Value = "UTTARAKHAND" });
        ViewBag.StateList = list;
    }

看法

@Html.DropDownList（“StateList”，ViewBag.StateList为IEnumerable，新的{@class=“form control input sm”}）

想做这样的事吗

                @Html.DropDownList( here m => m.State , ViewBag.StateList as IEnumerable<SelectListItem>, new { @class = "form-control  input-sm" })

@Html.DropDownList（此处m=>m.State，ViewBag.StateList为IEnumerable，新的{@class=“form control input sm”}）

但是在dropdownlist中使用m=>m.State时出错 如何使其在控制器中工作以访问其值

更新： 在模型中声明了一个selectlist，并尝试了DropDownList for

                @Html.DropDownListFor(m=>m.State,Model.list as IEnumerable<SelectListItem> ,new { @class = "form-control  input-sm" })

@Html.DropDownListFor（m=>m.State，Model.list作为IEnumerable，新的{@class=“form control input sm”}）

示例：

public class BR_Model
{
    public string State { get; set; };
    public DateTime Date { get; set; };
}

public HomeController()
    {
        [HttpGet]
        public ActionResult Create()
        {
            var list = new List<SelectListItem>
            {
                new SelectListItem {Text = "HO", Value = "HO"},
                new SelectListItem {Text = "BIHAR", Value = "BIHAR"},
                new SelectListItem {Text = "CHHATTISGARH", Value = "CHHATTISGARH"},
                new SelectListItem {Text = "HARYANA", Value = "HARYANA"},
                new SelectListItem {Text = "Madhya PRADESH", Value = "Madhya PRADESH"},
                new SelectListItem {Text = "PUNJAB", Value = "PUNJAB"},
                new SelectListItem {Text = "RAJASTHAN", Value = "RAJASTHAN"},
                new SelectListItem {Text = "UTTAR PRADESH (E)", Value = "UTTAR PRADESH (E)"},
                new SelectListItem {Text = "UTTAR PRADESH (W)", Value = "UTTAR PRADESH (W)"},
                new SelectListItem {Text = "UTTARAKHAND", Value = "UTTARAKHAND"}
            };
            ViewBag.StateList = list;
            return View();
        }

        [HttpPost]
        public ActionResult Create(BR_Model model)
        {
          return View();
        }
    }

@model BR_Model 

@using (Html.BeginForm("Create", "Home"))//Or use Ajax.BeginForm if you need
{
   <div class="form-group">
    @Html.DisplayNameFor(m => m.State )
    @Html.DropDownListFor(m => m.State , new SelectList((IEnumerable)ViewBag.StateList,"Value","Text",Model.State ))
</div>
    <input type="submit" value="Save" />
}

型号：

public class BR_Model
{
    public string State { get; set; };
    public DateTime Date { get; set; };
}

public HomeController()
    {
        [HttpGet]
        public ActionResult Create()
        {
            var list = new List<SelectListItem>
            {
                new SelectListItem {Text = "HO", Value = "HO"},
                new SelectListItem {Text = "BIHAR", Value = "BIHAR"},
                new SelectListItem {Text = "CHHATTISGARH", Value = "CHHATTISGARH"},
                new SelectListItem {Text = "HARYANA", Value = "HARYANA"},
                new SelectListItem {Text = "Madhya PRADESH", Value = "Madhya PRADESH"},
                new SelectListItem {Text = "PUNJAB", Value = "PUNJAB"},
                new SelectListItem {Text = "RAJASTHAN", Value = "RAJASTHAN"},
                new SelectListItem {Text = "UTTAR PRADESH (E)", Value = "UTTAR PRADESH (E)"},
                new SelectListItem {Text = "UTTAR PRADESH (W)", Value = "UTTAR PRADESH (W)"},
                new SelectListItem {Text = "UTTARAKHAND", Value = "UTTARAKHAND"}
            };
            ViewBag.StateList = list;
            return View();
        }

        [HttpPost]
        public ActionResult Create(BR_Model model)
        {
          return View();
        }
    }

@model BR_Model 

@using (Html.BeginForm("Create", "Home"))//Or use Ajax.BeginForm if you need
{
   <div class="form-group">
    @Html.DisplayNameFor(m => m.State )
    @Html.DropDownListFor(m => m.State , new SelectList((IEnumerable)ViewBag.StateList,"Value","Text",Model.State ))
</div>
    <input type="submit" value="Save" />
}

控制器：

public class BR_Model
{
    public string State { get; set; };
    public DateTime Date { get; set; };
}

public HomeController()
    {
        [HttpGet]
        public ActionResult Create()
        {
            var list = new List<SelectListItem>
            {
                new SelectListItem {Text = "HO", Value = "HO"},
                new SelectListItem {Text = "BIHAR", Value = "BIHAR"},
                new SelectListItem {Text = "CHHATTISGARH", Value = "CHHATTISGARH"},
                new SelectListItem {Text = "HARYANA", Value = "HARYANA"},
                new SelectListItem {Text = "Madhya PRADESH", Value = "Madhya PRADESH"},
                new SelectListItem {Text = "PUNJAB", Value = "PUNJAB"},
                new SelectListItem {Text = "RAJASTHAN", Value = "RAJASTHAN"},
                new SelectListItem {Text = "UTTAR PRADESH (E)", Value = "UTTAR PRADESH (E)"},
                new SelectListItem {Text = "UTTAR PRADESH (W)", Value = "UTTAR PRADESH (W)"},
                new SelectListItem {Text = "UTTARAKHAND", Value = "UTTARAKHAND"}
            };
            ViewBag.StateList = list;
            return View();
        }

        [HttpPost]
        public ActionResult Create(BR_Model model)
        {
          return View();
        }
    }

@model BR_Model 

@using (Html.BeginForm("Create", "Home"))//Or use Ajax.BeginForm if you need
{
   <div class="form-group">
    @Html.DisplayNameFor(m => m.State )
    @Html.DropDownListFor(m => m.State , new SelectList((IEnumerable)ViewBag.StateList,"Value","Text",Model.State ))
</div>
    <input type="submit" value="Save" />
}

公共家庭控制器（）
{
[HttpGet]
公共操作结果创建（）
{
变量列表=新列表
{
新建SelectListItem{Text=“HO”，Value=“HO”}，
新建SelectListItem{Text=“BIHAR”，Value=“BIHAR”}，
新建SelectListItem{Text=“CHHATTISGARH”，Value=“CHHATTISGARH”}，
新建SelectListItem{Text=“HARYANA”，Value=“HARYANA”}，
新建SelectListItem{Text=“中央邦”，Value=“中央邦”}，
新建SelectListItem{Text=“PUNJAB”，Value=“PUNJAB”}，
新建SelectListItem{Text=“RAJASTHAN”，Value=“RAJASTHAN”}，
新建SelectListItem{Text=“北方邦（E）”，Value=“北方邦（E）”，
新建SelectListItem{Text=“北方邦（W）”，Value=“北方邦（W）”，
新建SelectListItem{Text=“UTTARAKHAND”，Value=“UTTARAKHAND”}
};
ViewBag.StateList=列表；
返回视图（）；
}
[HttpPost]
公共行动结果创建（BR_模型）
{
返回视图（）；
}
}

查看：

public class BR_Model
{
    public string State { get; set; };
    public DateTime Date { get; set; };
}

public HomeController()
    {
        [HttpGet]
        public ActionResult Create()
        {
            var list = new List<SelectListItem>
            {
                new SelectListItem {Text = "HO", Value = "HO"},
                new SelectListItem {Text = "BIHAR", Value = "BIHAR"},
                new SelectListItem {Text = "CHHATTISGARH", Value = "CHHATTISGARH"},
                new SelectListItem {Text = "HARYANA", Value = "HARYANA"},
                new SelectListItem {Text = "Madhya PRADESH", Value = "Madhya PRADESH"},
                new SelectListItem {Text = "PUNJAB", Value = "PUNJAB"},
                new SelectListItem {Text = "RAJASTHAN", Value = "RAJASTHAN"},
                new SelectListItem {Text = "UTTAR PRADESH (E)", Value = "UTTAR PRADESH (E)"},
                new SelectListItem {Text = "UTTAR PRADESH (W)", Value = "UTTAR PRADESH (W)"},
                new SelectListItem {Text = "UTTARAKHAND", Value = "UTTARAKHAND"}
            };
            ViewBag.StateList = list;
            return View();
        }

        [HttpPost]
        public ActionResult Create(BR_Model model)
        {
          return View();
        }
    }

@model BR_Model 

@using (Html.BeginForm("Create", "Home"))//Or use Ajax.BeginForm if you need
{
   <div class="form-group">
    @Html.DisplayNameFor(m => m.State )
    @Html.DropDownListFor(m => m.State , new SelectList((IEnumerable)ViewBag.StateList,"Value","Text",Model.State ))
</div>
    <input type="submit" value="Save" />
}

Create.cshtml:

public class BR_Model
{
    public string State { get; set; };
    public DateTime Date { get; set; };
}

public HomeController()
    {
        [HttpGet]
        public ActionResult Create()
        {
            var list = new List<SelectListItem>
            {
                new SelectListItem {Text = "HO", Value = "HO"},
                new SelectListItem {Text = "BIHAR", Value = "BIHAR"},
                new SelectListItem {Text = "CHHATTISGARH", Value = "CHHATTISGARH"},
                new SelectListItem {Text = "HARYANA", Value = "HARYANA"},
                new SelectListItem {Text = "Madhya PRADESH", Value = "Madhya PRADESH"},
                new SelectListItem {Text = "PUNJAB", Value = "PUNJAB"},
                new SelectListItem {Text = "RAJASTHAN", Value = "RAJASTHAN"},
                new SelectListItem {Text = "UTTAR PRADESH (E)", Value = "UTTAR PRADESH (E)"},
                new SelectListItem {Text = "UTTAR PRADESH (W)", Value = "UTTAR PRADESH (W)"},
                new SelectListItem {Text = "UTTARAKHAND", Value = "UTTARAKHAND"}
            };
            ViewBag.StateList = list;
            return View();
        }

        [HttpPost]
        public ActionResult Create(BR_Model model)
        {
          return View();
        }
    }

@model BR_Model 

@using (Html.BeginForm("Create", "Home"))//Or use Ajax.BeginForm if you need
{
   <div class="form-group">
    @Html.DisplayNameFor(m => m.State )
    @Html.DropDownListFor(m => m.State , new SelectList((IEnumerable)ViewBag.StateList,"Value","Text",Model.State ))
</div>
    <input type="submit" value="Save" />
}

@model BR\u model
@使用（Html.BeginForm（“Create”，“Home”）//或者如果需要，使用Ajax.BeginForm
{
@DisplayNameFor（m=>m.State）
@DropDownListFor（m=>m.State，新选择列表（（IEnumerable）ViewBag.StateList，“值”，“文本”，Model.State））
}

错误是什么？无法将Lambda表达式转换为'string'类型，因为它不是委托类型您需要使用DropdownList，因为它必须是@Html.DropDownListFor（m=>m.State，ViewBag.StateList as IEnumerable，new{@class=“form control input sm”}）Thaks，我学会了绑定DropdownList的新方法，对初学者来说是一个很好的学习，但我的问题是-没有在返回视图中传递模型对象，在传递模型对象之后它就可以工作了。再次感谢您抽出时间