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