为什么我的Dropdownlist获取不到用户输入的Text值? - FineUI 官方论坛

<f:Grid ID="Grid1" ShowBorder="true" ShowHeader="False" Title="表格" Width="560px" Height="250px" runat="server" EnableCollapse="true"
DataKeyNames="ID" Margin="5">
<Toolbars>
<f:Toolbar ID="Toolbar2" runat="server">
<Items>
<f:DropDownList ID="DropDownList_F阀位号" runat="server" Label="F阀位号" LabelWidth="60px" Width="150px" EnableEdit="True" ForceSelection="False"></f:DropDownList>
<f:DropDownList ID="DropDownList_Y源状态" runat="server" Label="Y源状态" LabelWidth="65px" Width="150px" EnableEdit="True" ForceSelection="False"></f:DropDownList>
<f:DropDownList ID="DropDownList_M目标状态" runat="server" Label="M目标状态" LabelWidth="80px" Width="150px" EnableEdit="True" ForceSelection="False"></f:DropDownList>
<f:Button ID="Button_增加" runat="server" Text="增加" OnClick="Button_增加_Click"></f:Button>
<f:Button ID="Button_减少" runat="server" Text="-" OnClick="Button_减少_Click"></f:Button>
</Items>
</f:Toolbar>
</Toolbars>

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protected void Button_增加_Click(object sender, EventArgs e)
{
if (string.IsNullOrEmpty(DropDownList_F阀位号.SelectedText) && string.IsNullOrEmpty(DropDownList_F阀位号.Text))
{
Alert.Show("请完整填写相关数据!");
return;
}
}

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