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  • 省份+城市---Dropdownlist控件的应用

    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>        //防止页面的刷新

    <asp:DropDownList ID="drop_sheng" runat="server" AutoPostBack="True" onselectedindexchanged="drop_sheng_SelectedIndexChanged" DataTextField="name" DataValueField="id">
    </asp:DropDownList>
    <asp:DropDownList ID="drop_qu" runat="server" AutoPostBack="True">
    </asp:DropDownList>

    </ContentTemplate>
    </asp:UpdatePanel>

    protected void Bindshengfen()
    {
    drop_sheng.DataSource = DB.GetDataSet("id,name", "shengfen", "parentid=0", "id asc");
    drop_sheng.DataTextField = "name";
    drop_sheng.DataValueField = "id";
    drop_sheng.DataBind();
    drop_sheng.Items.Insert(0, new ListItem("省份", ""));
    }
    protected void Binddiqu()
    {
    drop_qu.DataSource = DB.GetDataSet("id,name", "chengshi", "parentid='" + drop_sheng.SelectedValue.ToString() + "'", "idasc");
    drop_qu.DataTextField = "name";
    drop_qu.DataValueField = "id";
    drop_qu.DataBind();
    drop_qu.Items.Insert(0, new ListItem("城市", ""));
    }
    protected void drop_sheng_SelectedIndexChanged(object sender, EventArgs e)
    {
    Binddiqu();
    }

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  • 原文地址:https://www.cnblogs.com/candyzhmm/p/4914008.html
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