我用自带的SqlDataSource绑定DropDownList后,如下:
<asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource1" DataTextField="ct_Name" DataValueField="ct_ID"> </asp:DropDownList>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:SqlConnectionString %>" SelectCommand="SELECT * FROM [db]">
为什么DropDownList1.Items.Count.ToString()的值为0??但是结果页面是正常的.
导致ListItem item = DropDownList1.Items.FindByValue(sParentID.ToString());一直都是无法找相应的值.
如果我用手动编辑DropDownList ,如下:
<asp:DropDownList ID="DropDownList2" runat="server">
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
<asp:ListItem>3</asp:ListItem>
</asp:DropDownList>
为什么这个能得到值??难道非要我手写代码进行绑定DropDownList??新手分不多啊,意思意思就行了,大家见谅!!
<asp:DropDownList ID="DropDownList1" runat="server" DataSourceID="SqlDataSource1" DataTextField="ct_Name" DataValueField="ct_ID"> </asp:DropDownList>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:SqlConnectionString %>" SelectCommand="SELECT * FROM [db]">
为什么DropDownList1.Items.Count.ToString()的值为0??但是结果页面是正常的.
导致ListItem item = DropDownList1.Items.FindByValue(sParentID.ToString());一直都是无法找相应的值.
如果我用手动编辑DropDownList ,如下:
<asp:DropDownList ID="DropDownList2" runat="server">
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
<asp:ListItem>3</asp:ListItem>
</asp:DropDownList>
为什么这个能得到值??难道非要我手写代码进行绑定DropDownList??新手分不多啊,意思意思就行了,大家见谅!!
DropDownList1.DataBind();
Label1.Text= DropDownList1.Items.Count.ToString();
懂了,谢谢2楼!
DropDownList1.DataBind();
Label1.Text= DropDownList1.Items.Count.ToString();