将DropDownListFor绑定到变量列表

Question

这有效

@Html.DropDownListFor(model => Model.Assessment.Interviewer, Model.SiteListing)

这不是

<div class="resident-relationship">@Html.DropDownListFor(m => Model.HouseholdMembersListing.ElementAt(i).Relationship, Model.ResidentTypeListing, new { @class = "t150"})</div>

如何正确使用@HTML.DropdownListFor绑定到List＆lt; 任何＆gt;所以在POST到控制器它会有价值？我有一个页面，家里可以有很多居民。我有其他绑定，如姓名和年龄，他们运作良好。但是在关系上我需要有下拉列表。

Answer 1

 var ddlStates = '#dropdownlistId'  

$.ajax({
                cache:false,
                type: "GET",
                url: "@(Url.Action("GetStatesByCountryId", "Country"))",
                data: "countryId=" + selectedItem + "&addEmptyStateIfRequired=true",
                success: function (data) {
                    ddlStates.html('');
                    $.each(data, function(id, option) {
                        if( option.name=="Maharashtra")
                        {
                        ddlStates.append($('<option></option>').val(76).html(option.name));
                        }
                    });


                },
                error:function (xhr, ajaxOptions, thrownError){
                    alert('Failed to retrieve states.');
                    statesProgress.hide();
                }  
            });