具有键“MyDrpId1”的ViewData项的类型为“System.String”，但必须是“IEnumerable <selectlistitem>”类型

Question

我使用的是Asp.net MVC。我想根据下拉列表选择值选择值。但我得到例外。这是我的代码 控制器

public ActionResult batsmenGrid()
    {

        List<batsmenModel> bM = new List<batsmenModel>();
     //   DataTable dtbl = new DataTable();
        List<string> teams = new List<string>();
        DataSet ds = new DataSet();
        ds = Connection.DAL.GetQuery("select * from batsmen"); // Using DAL file saved in App_Code folder
        foreach (DataRow dr in ds.Tables[0].Rows)
        {
            bM.Add(new batsmenModel
            {
                _bid = Convert.ToInt32(dr["b_id"].ToString()),
                _bName = dr["b_name"].ToString(),
                _bAverage = dr["b_average"].ToString(),
                _team = dr["team"].ToString()
            });
        }
        var itms = bM.GroupBy(g => new { g._team }).Select(s => new { name = s.Key._team, count = s.Count(), details = s.Select(ss => ss) }).ToList();
        foreach (var v in itms)
        {
            teams.Add(v.name.ToString());
        }
        ViewBag.Teams = teams;   //View pe data phenknay k lia use kiya ha

        ViewBag.Team2 = new SelectList(teams.AsEnumerable());  // Another way to use dropdown list

        return View(bM);
    }

   [HttpPost]
    //[ActionName("GetbatsmenWithId")]  
     public ActionResult batsmenGrid(string MyDrpId1)
    {
        List<batsmenModel> bM = new List<batsmenModel>();
        //   DataTable dtbl = new DataTable();
        List<String> teams = new List<String>();

        DataSet ds = new DataSet();
        ds = Connection.DAL.GetQuery("select * from batsmen where team = "+"'"+MyDrpId1+"'"); // Using DAL file saved in App_Code folder
        foreach (DataRow dr in ds.Tables[0].Rows)
        {
            bM.Add(new batsmenModel
            {
                _bid = Convert.ToInt32(dr["b_id"].ToString()),
                _bName = dr["b_name"].ToString(),
                _bAverage = dr["b_average"].ToString(),
                _team = dr["team"].ToString()
            });
        }
        var itms = bM.GroupBy(g => new { g._team }).Select(s => new { name = s.Key._team, count = s.Count(), details = s.Select(ss => ss) }).ToList();
        //var itms = bM.GroupBy(g => new { g._team }).Select(s => new { name = s.Key._team, count = s.Count(), details = s.Select(ss => ss) }).ToList();
        foreach (var v in itms)
        {
            teams.Add(v.name.ToString());

        }


        ViewBag.Teams = teams;   


        return View(bM);
    }

这是我的观点

 @model IEnumerable<MvcApplication1.Models.batsmenModel>

@{
ViewBag.Title = "batsmenGrid";
WebGrid grid = new WebGrid(Model, rowsPerPage: 2);
WebGrid grd = new WebGrid();

}
@using (Html.BeginForm("batsmenGrid", "batsmen"))
{


 @grid.GetHtml(

columns: new[]
{
grid.Column("_bid","Id"),                 //Models fields to display
grid.Column("_bName","Name"),
grid.Column("_bAverage","Average"),
grid.Column("_team","Team")



 }

 );
 @Html.DropDownList("MyDrpId1",(SelectList)ViewBag.Team2,"---Select Team---   ");


    <input type="submit" value="Get" />

}

当我打开i浏览器时，我在gridview中获取数据以及下拉但是当我选择值并提交时它会抛出异常      具有键“MyDrpId1”的ViewData项的类型为“System.String”，但必须是“IEnumerable”类型。