为此请参阅以下代码

For that see the following code

Controllers ->
      public JsonResult GetStudents(int id)
       {
           var states = db.Students.Where(x => x.courseID == id).ToList();
           return Json(states, JsonRequestBehavior.AllowGet);
       }

观看次数 - > Jquery

Views -> Jquery

（＃ddlCourse）。change（function（）{
var url =/ Controls_ / GetStudents;
var courseID =

("#ddlCourse").change(function () { var url = "/Controls_/GetStudents"; var courseID =

（＃ddlCourse）。val（）;

("#ddlCourse").val();