ASP.NET MVC中为DropDownListFor设置选中项的方法_实用技巧_

 public ActionResult SomeAction(int id) { //从数据库获取Domain Model var domainModel = ModelService.LoadEntities(m => m.ID == id).FirstOrDefault(); //通过某个方法获取List类型对象实例 List items = SomeMethod(); //遍历集合，如果当前Domain model的某个属性与SelectListItem的Value属性相等，把SelectListItem的Selected属性设置为true foreach(SelectListItem item in items) { if(item.Value == Convert.ToString(domainModel.某属性)) { item.Selected = true; } } //把List集合对象实例放到ViewData中 ViewData["somekey"] = items; //可能涉及到把Domain Model转换成View Model return PartialView(domainModel); } 

 public class Department { public int Id {get;set;} public string Name {get;set;} public bool IsSelected {get;set;} }

 public ActionResult Index() { SampleDbContext db = new SampleDbContext(); List selectListItems = new List(); //遍历Department的集合 foreach(Department department in db.Departments) { SelectListItem = new SelectListItem { Text = department.Name, Value = department.Id.ToString(), Selected = department.IsSelected.HasValue ? department.IsSelected.Value : false } selectListItems.Add(selectListItem); } ViewBag.Departments = selectListItems; return View(); }

 public ActionResult Index(FormCollection collection) { IList li = Utility.SqlHelper.getProjectList(); SelectList selec = new SelectList(li, "ID", "Name"); if (collection["drop"] != null) { string projectID = collection["drop"]; selec = new SelectList(li, "ID", "Name", projectID);//根据返回的选中项值设置选中项 ViewData["ruturned"] = collection["drop"]; } ViewData["drop"] = selec; return View(); }