谁知道怎么让DropDownList在已绑定数据源后再添加一些自定义项 我是用数据源进行绑的

Question

谁知道怎么让DropDownList在已绑定数据源后再添加一些自定义项,我是用数据源进行绑的

Answer 1

绑定完成后
this.DropDownList1.Item.Add(new ListItem("aa","1"));

Answer 2

DropDownList.Items.Insert(0,"--所有--")

Answer 3

this.DropDownList1.Item.Add(0，new ListItem("aa","1"));

Answer 4

<asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="AccessDataSource1"
        DataTextField="City" DataValueField="CityID" OnDataBound="DropDownList1_DataBound">
    </asp:DropDownList>
=======================
protected void DropDownList1_DataBound(object sender, EventArgs e)
    {
        this.DropDownList1.Items.Insert(0, new ListItem("---------", "------"));
    }

Answer 5

DropDownList1.Items.Add(new ListItem("aa","1")); //添加到末尾
DropDownList1.Items.Insert(0,new ListItem("aa","1"));//插入到指定位置