<script type="text/javascript">
 function getTeams(deptCode) {
 $.ajax({
 url: "@Url.Action("GetTeams","User")",data: { departmentCode: deptCode },dataType: "json",type: "POST",error: function () {
 alert("An error occurred.");
 },success: function (data) {
 var items = "";
 $.each(data,function (i,item) {
 items += "<option value=\"" + item.Value + "\">" + item.Text + "</option>";
 });
 
 $("#@Html.IdFor(m => m.TeamId)").html(items);
 }
 });
 }
 
 $(document).ready(function () {
 $("#@Html.IdFor(m => m.DepartmentCode)").change(function () {
 var deptCode = $("#@Html.IdFor(m => m.DepartmentCode)").val();
 
 getTeams(deptCode);
 });
 });
 </script>

根据部门ID（deptCode）获取该部门下的组（Team）。

Controller：

User的GetTeams（string departmentCode）返回一个集合，通过

$.each(data,item)