您可以将此下拉列表局部化：
@model MyViewModel@Html.DropDownListFor(model => model.SelectedDeviceModel, Model.DeviceModelList)
然后在主视图中将其包含在某个容器中：
@model MyViewModel...<div id="ddlcontainer"> @Html.Partial("Foo", Model)</div>...那么您可能会有一个控制器动作，该动作需要一些参数，并根据其值呈现此部分参数：
public ActionResult Foo(string somevalue){ MyViewModel model = ... go ahead and fill your view model return PartialView(model);}现在，最后一部分是在发生某些事件时发送AJAX请求以刷新下拉列表。例如，当某些其他ddl的值发生更改（或其他更改，单击按钮或其他操作）时：
$(function() { $('#SomeOtherDdlId').change(function() { // when the selection of some other drop down changes // get the new value var value = $(this).val(); // and send it as AJAX request to the newly created action $.ajax({ url: '@Url.Action("foo")', type: 'POST', data: { somevalue: value }, success: function(result) { // when the AJAX succeeds refresh the ddl container with // the partial HTML returned by the Foo controller action $('#ddlcontainer').html(result); } }); });});另一种可能性是使用JSON。您的
Foo控制器操作将仅返回一些包含新键/值集合的Json对象，并且在AJAX请求的成功回调中，您将刷新下拉列表。在这种情况下，您无需将其外部化为单独的部分。例如：
$(function() { $('#SomeOtherDdlId').change(function() { // when the selection of some other drop down changes // get the new value var value = $(this).val(); // and send it as AJAX request to the newly created action $.ajax({ url: '@Url.Action("foo")', type: 'POST', data: { somevalue: value }, success: function(result) { // when the AJAX succeeds refresh the dropdown list with // the JSON values returned from the controller action var selectedDeviceModel = $('#SelectedDeviceModel'); selectedDeviceModel.empty(); $.each(result, function(index, item) { selectedDeviceModel.append( $('<option/>', { value: item.value, text: item.text }) ); }); } }); });});最后，您的Foo控制器动作将返回Json：
public ActionResult Foo(string somevalue){ return Json(new[] { new { value = '1', text = 'text 1' }, new { value = '2', text = 'text 2' }, new { value = '3', text = 'text 3' } });}
