数据绑定时,ASPxComboBox'指定的强制转换无效'错误

时间:2011-09-26 08:58:33

标签: asp.net data-binding devexpress aspxcombobox

我有一个Dev Express ASPxComboBox:

<dx:ASPxComboBox runat="server" ID="DropDownListTemplates"
    DataSourceID="SqlDataSourceTemplates" ValueField="template_id" TextField="name" 
    ValueType="System.Int32" Enabled="false" Width="100%" SelectedIndex='<%# 
    Eval("subs_template") %>'/>

在运行时抛出“指定的强制转换无效错误”。这与

有关
SelectedIndex='<%# Eval("subs_template") %>'

表达式,但subs_template保证是一个数字:

<asp:SqlDataSource ID="SqlDataSourceClientDetail" runat="server"
        ConnectionString="<%$ code: AutoNat.ConnectionManager.AutoNatConnectionString %>"
        SelectCommand="SELECT *, isnull(subs_template_id, 0) subs_template FROM [person] p WHERE [person_id]=@person_id">
        <SelectParameters>
            <asp:SessionParameter Name="person_id" SessionField="personID" Type="Int32" />
        </SelectParameters>
    </asp:SqlDataSource>

    <asp:SqlDataSource ID="SqlDataSourceTemplates" runat="server" ConnectionString="<%$ code: AutoNat.ConnectionManager.AutoNatConnectionString %>"
       SelectCommand="SELECT * FROM 
                      (SELECT t.template_id, name FROM subs_template t UNION SELECT 0, 'Custom...') s 
                      ORDER BY template_id">
     </asp:SqlDataSource>

为什么这会一直失败?

我试过了

SelectedIndex='<%# 0 %>'

哪个工作正常!

1 个答案:

答案 0 :(得分:1)

您是否尝试过像这样的整数? Convert.ToInt32(Eval("subs_template"))