我想創建兩個下拉列表，但數據出現在一個下拉列表中，如下圖所示：在此輸入圖像描述而另一個是空的我想要B1和B2在一個下拉列表中并在其他下拉列表中命名 zahra控制器中的此代碼：// GET: Contracts/Createpublic ActionResult Create(){ var Sections = _context.Sections.ToList(); var Customers = _context.Customers.ToList(); List<SelectListItem> list = new List<SelectListItem>(); foreach (var item in Customers) { list.Add(new SelectListItem { Text = item.Customer_Name, Value = item.Customer_Id.ToString() }); ViewBag.Customers = list; } List<SelectListItem> list1 = new List<SelectListItem>(); foreach (var item in Sections) { list.Add(new SelectListItem { Text = item.Section_Name, Value = item.Section_Id.ToString() }); ViewBag.Sections = list1; } return View();}這是在視圖中 <div class="form-group"> @Html.LabelFor(model => model.CustomerId, htmlAttributes: new { @class = "control-label col-md-2" }) <div class="col-md-10"> @Html.DropDownListFor(model => model.CustomerId, (IEnumerable<SelectListItem>)ViewBag.Customers, "Select customers", new { @class = "form-control" }) @Html.ValidationMessageFor(model => model.CustomerId, "", new { @class = "text-danger" }) </div> </div> <div class="form-group"> @Html.LabelFor(model => model.SectionsId, htmlAttributes: new { @class = "control-label col-md-2" }) <div class="col-md-10"> @Html.DropDownListFor(model => model.SectionsId, (IEnumerable<SelectListItem>)ViewBag.Sections, "Select Sections", new { @class = "form-control" }) @Html.ValidationMessageFor(model => model.SectionsId, "", new { @class = "text-danger" }) </div> </div>
3 回答
函數式編程
TA貢獻1807條經驗 獲得超9個贊
在第 2 個 foreach 循環中，您將添加到第 1 個列表中，而不是名為 list1 的第 2 個列表。更正如下：
public ActionResult Create()
{
var Sections = _context.Sections.ToList();
var Customers = _context.Customers.ToList();
List<SelectListItem> list1 = new List<SelectListItem>();
foreach (var item in Customers)
{
list1.Add(new SelectListItem { Text = item.Customer_Name, Value = item.Customer_Id.ToString() });
}
ViewBag.Customers = list1;
List<SelectListItem> list2 = new List<SelectListItem>();
foreach (var item in Sections)
{
list2.Add(new SelectListItem { Text = item.Section_Name, Value = item.Section_Id.ToString() });
}
ViewBag.Sections = list2;
return View();
}
江戶川亂折騰
TA貢獻1851條經驗 獲得超5個贊
問題在于您的第二個 for-each 循環，您將其添加到實際上面向客戶的第一個列表中。SelectListItem
此外，簡化您的 GET 方法，如下所示。它將降低復雜性。Create
// GET: Contracts/Create
[HtttpGet]
public ActionResult Create()
{
var sections = _context.Sections.ToList();
var customers = _context.Customers.ToList();
ViewBag.SectionSelectList = new SelectList(sections,"Section_Id","Section_Name");
ViewBag.CustomerSelectList = new SelectList(customers,"Customer_Id","Customer_Name");
return View();
}
然后在視圖中將 s 替換為以下內容：@Html.DropDownListFor
@Html.DropDownListFor(model => model.CustomerId, ViewBag.CustomerSelectList, "Select customers", new { @class = "form-control" })
@Html.DropDownListFor(model => model.SectionsId, ViewBag.SectionSelectList , "Select Sections", new { @class = "form-control" })
撒科打諢
TA貢獻1934條經驗 獲得超2個贊
試試這個：
// GET: Contracts/Create
public ActionResult Create()
{
var listOfCustomers = new List<SelectListItem>();
foreach (var item in _context.Customers.ToList())
{
listOfCustomers.Add(new SelectListItem { Text = item.Customer_Name, Value = item.Customer_Id.ToString() });
}
ViewBag.Customers = listOfCustomers;
var listOfSections = new List<SelectListItem>();
foreach (var item in _context.Sections.ToList())
{
listOfSections.Add(new SelectListItem { Text = item.Section_Name, Value = item.Section_Id.ToString() });
}
ViewBag.Sections = listOfSections;
return View();
}
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