Question

以下是选择列表项的集合：我想将此选择项转换为SelectList并将其分配给mvc dropdownlist。

List<SelectListItem>     Genderitems     =    new List<SelectListItem>();
Genderitems.Add(new SelectListItem() { Text = "Female", Value = "Female" });
Genderitems.Add(new SelectListItem() { Text = "Male", Value = "Male" });
Genderitems.Add(new SelectListItem() { Text = "Other Gender", Value = "Other Gender" });
Genderitems.Add(new SelectListItem() { Text = "Unspecified or Unknown", Value = "Unspecified or Unknown" });

Answer 1

可能你正在寻找这个

List<SelectListItem>     Genderitems     =    new List<SelectListItem>();
Genderitems.Add(new SelectListItem() { Text = "Female", Value = "Female" });
Genderitems.Add(new SelectListItem() { Text = "Male", Value = "Male" });
Genderitems.Add(new SelectListItem() { Text = "Other Gender", Value = "Other Gender" });
Genderitems.Add(new SelectListItem() { Text = "Unspecified or Unknown", Value = "Unspecified or Unknown" });
SelectList sl = new SelectList(Genderitems, "Value", "Text");
ViewBag.GenderList = sl;

在您的视图中如果你不想严格限制选择模型

@Html.DropDownList("drpGender", ViewBag.GenderList as SelectList, "Select Gender", new { id = "drpGender"})

在其他情况下你可以

@Html.DropDownListFor(x=>x.Gender, ViewBag.GenderList as SelectList, " ", new { id = "drpGender"})

Answer 2

class ProjectView(sqla.ModelView): ''' def inaccessible_callback(self, name, **kwargs): if current_user.is_authenticated: abort(403) else: return redirect(url_for('security.login', next=request.url)) ''' def is_accessible(self): if not current_user.is_active or not current_user.is_authenticated: return False else: return True @property def _list_columns(self): return self.get_list_columns() @_list_columns.setter def _list_columns(self,value): pass @property def column_list(self): if not has_app_context() or current_user.has_role('superuser'): return ['team', 'project_name', 'approve'] else: return ['team', 'project_name'] form_edit_rules = column_list create_template = 'rule_create.html' edit_template = 'rule_edit.html'和SelectList都在实施接口List<SelectListItem>。用于创建下拉列表的扩展方法如下所示：

IEnumerable<SelectListItem>

正如您所看到的，这两种扩展方法都接受public static MvcHtmlString DropDownList(this HtmlHelper htmlHelper, string name, IEnumerable<SelectListItem> selectList); public static MvcHtmlString DropDownListFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IEnumerable<SelectListItem> selectList);而不是IEnumerable<SelectList>，因此正如@StephenMuecke所说，您无需将SelectList转换为List<SelectListItem>。< / p>

如何将SelectListItem转换为SelectList并分配给mvc下拉列表

2 个答案: