如何向 ComboBox 添加一个空白选项

public function result(event:ResultEvent):void{ var array:ArrayCollection = event.result as ArrayCollectionvar obj:Object = new Object()array.addItem(obj)combobox.dataProvider = array}

与表绑定后就不允许添加元素了吧。 能不能把空行放在数据表呢？答案是可以的，那有没有别的办法呢，肯定也是有的，selectindex=-1表示未选中任何荐项目在绑定的数据表中增加1行，代码如下： dim mytb as DataTable '此处需实例化mytb，然后绑定控件即可... Dim myRow As DataRow myRow = mytb.NewRow myRow.Item( "xx ") = 0 myRow.Item( "xxx ") = "不选任何项 " dsNodeList.Tables(0).Rows.InsertAt(myRow, 0) With combobox1 .DataSource = mytb .DisplayMember = "xxx " .ValueMember = "xx " End With

---