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[英]how to resolve "'System.Collections.Generic.List<string>' to 'System.Collections.Generic.List<System.Web.Mvc.SelectListItem>''
[英]cannot convert from 'System.Collections.Generic.IEnumerable<System.Web.Mvc.SelectListItem>' to 'string' while using ViewData for @Html.DropDownListFor
我發現很多關於相同問題的帖子,但沒有一個是與視圖數據相關的並且與存儲庫相關聯。 我只需要使用一個 class 沒有單獨的 class 用於Countries
和Gender
,請。
錯誤:
Controller
[HttpGet]
public ActionResult Member(int? MemberId)
{
if (MemberId == null)
{
Member m = new Member();
ViewData["CountriesList"] = _dal.GetCountryList();
ViewData["GenderList"] = _dal.GetGenderList();
return View(m);
}
var data = _dal.GetMemberData(MemberId);
if (data == null)
{
return View();
}
return View(data);
}
Class
public string Country { get; set; }
public string Gender { get; set; }
public string Address { get; set; }
public int Phone { get; set; }
public IEnumerable<SelectListItem> _CountriesList { get; set; }
public IEnumerable<SelectListItem> _GenderList { get; set; }
看法
<div class="col-md-8">
<div class="col-md-4">
<label id="country">Country</label>
@Html.DropDownListFor(m => m.Country, Model._CountriesList, ViewData["CountriesList"] as IEnumerable<SelectListItem>, new { @class = "form-control", placeholder = "-- Select Country --" })
</div>
<div class="col-md-4">
<label id="gender">Gender</label><br />
@Html.DropDownListFor(m => m.Gender, Model._GenderList, ViewData["GenderList"] as IEnumerable<SelectListItem>, new { @class = "form-control", placeholder = "-- Select Gender --" })
</div>
</div>
存儲庫
[public IEnumerable<SelectListItem> GetCountryList()
{
var _country = new List<SelectListItem>();
using (SqlConnection con = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand("sp_CountryList", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@Flag", "getCountryList");
con.Open();
SqlDataReader sdr = cmd.ExecuteReader();
while (sdr.Read())
{
_country.Add(new SelectListItem { Text = sdr["CountryName"].ToString(), Value = sdr["rowId"].ToString() });
}
con.Close();
}
return _country;
}]
您似乎正在嘗試同時將兩個數據源設置為 DropDownList,它們是Model._CountriesList
和ViewData["CountriesList"]
,它會導致構建錯誤。 沒有DropDownListFor
這樣的重載方法,您必須選擇其中一個ViewBag
或Model
。
正如我正確理解的那樣,您不需要使用_CountriesList
或_GenderList
所以只需刪除Model._CountriesList
因為您使用ViewBag
:
<div class="col-md-8">
<div class="col-md-4">
<label id="country">Country</label>
@Html.DropDownListFor(m => m.Country, ViewData["CountriesList"] as IEnumerable<SelectListItem>, new { @class = "form-control", placeholder = "-- Select Country --" })
</div>
<div class="col-md-4">
<label id="gender">Gender</label><br />
@Html.DropDownListFor(m => m.Gender, ViewData["GenderList"] as IEnumerable<SelectListItem>, new { @class = "form-control", placeholder = "-- Select Gender --" })
</div>
</div>
有關更多信息,請查看DropDownListFor
的重載
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