2.代码循环添加
for(int i=0i<100i++)
{
ListItem item=new ListItem(i.ToString(),"手动添加"+i.ToString())
dropdownList.Items.Add(item)
}
3.还可以手动添加
有两种方法:一种是用dual表查空值,然后绑定。另一种是先动态绑定数据后,然后插入一列默认项。
eg1:
string selectQuery = "select null extattrid,null extattrname from dual union all select extattrid,extattrname from VExtAttrDetail where extattrsn in (22)"DataSet ds=dboperReq.GetDSet(selectQuery)
ddlTrantype.DataTextField = "extattrname"
ddlTrantype.DataValueField="extattrid"
ddlTrantype.DataSource=ds.Tables[0].DefaultView
ddlTrantype.DataBind()
eg2:
string selectQuery = "select extattrid,extattrname from VExtAttrDetail where extattrsn in (22)"DataSet ds=dboperReq.GetDSet(selectQuery)
ddlTrantype.DataTextField = "extattrname"
ddlTrantype.DataValueField="extattrid"
ddlTrantype.DataSource=ds.Tables[0].DefaultView
ddlTrantype.DataBind()
ddlTrantype.Items.Insert(0,new ListItem(" "," ")) //或者ListItem it = new ListItem("请选择", "0")
//mydroplist.Items.Insert(0,it) 或者 ListItem lt = new ListItem()
//lt.Text = "请选择"
//lt.Value = "00"
//lt.Selected = true
//ddp.Items.Add(lt)
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