多Dropdownlist列表的ASP.NET模型绑定

Question

我想用db的值设置多个下拉列表。

在这里，代码：

视图

 @Html.DropDownListFor(model => model.rcf_data.lnkt_PIC, Model.Emp_list.EmployeList, new { @class = "show-tick form-control", id = "EmployeeList9", multiple = "multiple" })

控制器

在控制器中，我使用MergeModel。

    public ActionResult Edit(String rcf_id)
            {
                //List<RCFHistory> list_history_status = 
    
                MergeModel model = new MergeModel();
                model.rcf_history = new List<RCFHistory>();
                model.rcf_history = GetRCFHistory(rcf_id);
                model.rcf_data = list_rcf.Where(r => r.lnkt_name == rcf_id).FirstOrDefault();
                model.Emp_list = new ListEmployeeMaster();
                model.Emp_list.EmployeList = new SelectList(GetAllEmployee(), "emp_id", "emp_name");
                return View(model);
            }

private IEnumerable<EmployeeNameModel> GetAllEmployee()
        {
            list_emp = new List<EmployeeNameModel>();
            string apiUrl = "http://localhost:6161/Service1.svc";

            HttpClient client = new HttpClient();
            HttpResponseMessage response = client.GetAsync(apiUrl + string.Format("/GetAllEmployee")).Result;
            if (response.IsSuccessStatusCode)
            {
                list_emp = (new JavaScriptSerializer()).Deserialize<List<EmployeeNameModel>>(response.Content.ReadAsStringAsync().Result);
            }

            return list_emp;
        }

我希望将视图中的model.rcf_data.lnkt_PIC (即List<String> )的值设置为DropDownListFor。但它总是显示出空场。

对于单个DropDownListFor，这一行适合我，它显示了我从DB获得的价值：

 @Html.DropDownListFor(model => model.rcf_data.lnkt_2ndapprovalid, Model.Emp_list.EmployeList, Model.rcf_data.lnkt_2ndapprovalid, new { id = "EmployeeList2", @class = "show-tick form-control" })

Answer 1

从DropDownListFor到ListBoxFor的转变解决了我的问题。在我的代码中没有发生其他更改。