我已经创建了一个 2 多选列表，它显示在一个文本框中，我将运行该程序

Question

我在 create() 函数中为联系人组详细信息和员工详细信息创建了 2 个多选列表，而它们的视图在运行时不同，它出现在 1 个文本框中。不确定为什么会这样？

我尝试更改视图，控制器也在这里是我的控制器的代码：

// GET: DistributionLists/Create

        public ActionResult Create()

        {   //LIST FOR CONTACT DETAILS

            var contact = db.Contact;

            List<SelectListItem> items = new List<SelectListItem>();

            foreach (var item in contact)

            {

              items.Add(new SelectListItem

            {

              Value = item.EmployeeId.ToString(),

                Text = item.EmployeeName.ToString(),

            });

 

            };

            ViewBag.Contacts = items;

            //  ViewBag.EmployeeId = new SelectList (db.Contact, "EmployeeId","EmployeeName");

 

            //LIST FOR CONTACT GROUP DETAILS

            var cg = db.ContactGroup;

            List<SelectListItem> ims = new List<SelectListItem>();

            foreach (var im in cg)

            {

                items.Add(new SelectListItem

                {

                    Value = im.ContactGroupID.ToString(),

                    Text = im.ContactGroupName.ToString(),

                });

 

            };

            ViewBag.cg = ims;

            return View();

        }

Here is the code for my View of the create page:

<div class="form-group">

         @Html.LabelFor(model => model.EmployeeId, "EmployeeName", htmlAttributes: new { @class = "control-label col-md-2" })

        <div class="col-md-10">

            @Html.DropDownList("Contacts", ViewBag.Contacts as List<SelectListItem>, new { @class = "form-control", multiple = "multiple" })

            @Html.ValidationMessageFor(model => model.EmployeeId, "", new { @class = "text-danger" })

        </div>

    </div>

 

    <div class="form-group">

        @Html.LabelFor(model => model.ContactGroupId, "ContactGroupName", htmlAttributes: new { @class = "control-label col-md-2" })

        <div class="col-md-10">

            @Html.DropDownList("ContactGroupId", ViewBag.cg as List<SelectListItem>, new { @class = "form-control", multiple = "multiple" })

            @Html.ValidationMessageFor(model => model.ContactGroupId, "", new { @class = "text-danger" })

        </div>

    </div>

Answer 1

您已经在控制器端创建了两个列表。 您已添加第一个列表中的所有项目

List<SelectListItem> ims = new List<SelectListItem>();

            foreach (var im in cg)

            {

                ims.Add(new SelectListItem

                {

                    Value = im.ContactGroupID.ToString(),

                    Text = im.ContactGroupName.ToString(),

                });

 

            };
  ViewBag.cg = ims;

只需更改 items.Add 到 ims.Add 循环

Answer 2

虽然它们的视图在运行时不同，但它出现在 1 个文本框中。

从您的代码中，您将所有内容设置为items

 List<SelectListItem> ims = new List<SelectListItem>();

            foreach (var im in cg)

            {

                items.Add(new SelectListItem

                {

                    Value = im.ContactGroupID.ToString(),

                    Text = im.ContactGroupName.ToString(),

                });

 

            };

            ViewBag.cg = ims;

更改项目。添加到items.Add ims.Add ：

ims.Add(new SelectListItem
    
                    {
    
                        Value = im.ContactGroupID.ToString(),
    
                        Text = im.ContactGroupName.ToString(),
    
                });