Asp.net 如何填写下拉列表

大家好，我有一个问题，关于如何将项目添加到具有某些属性的dropdownlist。我的第一个想法是：

<asp:GridView ID="GV_Area" runat="server" AutoGenerateColumns="false" CssClass="table table-striped bolsa-table-gv text-center"
                                                            DataKeyNames="Area,Oferta">
       <Columns>
             <asp:BoundField DataField="Nombre" HeaderText="Nombre" ReadOnly="true" />
                     <asp:TemplateField>
                             <ItemTemplate>
                                   <asp:DropDownList ID="ddl_Especializaciones" runat="server" CssClass="selectpicker" multiple DataSource='<%#GetDropDownData(Container)%>'></asp:DropDownList>
                             </ItemTemplate>
                     </asp:TemplateField>
       </Columns>
</asp:GridView>

元素正确地包含在dropdownlist中，但仅包含文本属性。已选择该选项，但该值不起作用。你认为我做错了什么？或者，我能用另一种方式轻松地做到吗

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非常感谢您的帮助

如果您在GridView中使用DropDownList，用数据填充它们的最简单方法是使用OnRowDataBound事件

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也许可以尝试为DropDownList的ddl_Specializaciones数据绑定事件连接一个处理程序。非常感谢！

    Protected Function GetDropDownData(e As System.Web.UI.WebControls.GridViewRow) As ListItem()

            Dim item As ListItem = New ListItem
            Dim arr As ArrayList = New ArrayList

            item.Selected = True
            item.Text = "Hello"
            item.Value = "Hello2"
            arr.Add(item)

            Return arr
        End Function

<asp:GridView ID="GV_Area" runat="server" OnRowDataBound="GV_Area_RowDataBound">

Protected Sub GV_Area_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)

    'check if the row is a datarow
    If (e.Row.RowType = DataControlRowType.DataRow) Then

        'cast the row back to a datarowview
        Dim row As DataRowView = CType(e.Row.DataItem,DataRowView)

        'use findcontrol to locate the dropdownlist
        Dim ddl As DropDownList = CType(e.Row.FindControl("ddl_Especializaciones"),DropDownList)

        'if you need to use a datasource value for filling the dropdownlist
        Dim Nombre As Integer = Convert.ToInt32(row("Nombre"))

        'now fill the dropdownlist with values

        'from a datasource, where 'textField' and `valueField` are colums/properties of the datasource
        ddl.DataSource = Common.LoadFromDB
        ddl.DataTextField = "textField"
        ddl.DataValueField = "valueField"
        ddl.DataBind

        'or add them manually
        ddl.Items.Insert(0, New ListItem("Item A", "1", true))
        ddl.Items.Insert(1, New ListItem("item B", "1", true))

    End If

End Sub