将Custom对象中的列表绑定到GridView

Question

有一个objectdatasource返回一个自定义对象列表（List（of Book） - 方法名称：GetBooksList）

必须在gridview中显示名称作者和发布者作为标签，并在下拉列表中显示publicationDates .Iam在gridview中显示dropdownlist（publicationDates）中的值时出现问题。

有人能让我知道我失踪的是什么吗？

Public Class Book 
    Public Name As String  
    Public Author As String  
    Public Publisher As String   
    Public PublicationDates As List(Of String) 
End Class



    <asp:ObjectDataSource runat="server" SelectMethod="GetBooksList" ID="objBooks" TypeName="TestData"> 
<asp:GridView runat="server" ID="gvResults" DataSourceID="objBooks" > 
    <Columns>     
    <asp:BoundField DataField="Name" HeaderText="Book Name" ReadOnly="True" > 
        <HeaderStyle HorizontalAlign="Center" /> 
    </asp:BoundField> 
    <asp:BoundField DataField="Author" HeaderText="Author" ReadOnly="True" > 
        <HeaderStyle HorizontalAlign="Center" /> 
    </asp:BoundField> 
    <asp:BoundField DataField="Publisher" HeaderText="Publisher" ReadOnly="True" > 
        <HeaderStyle HorizontalAlign="Center" /> 
    </asp:BoundField>     
     <asp:TemplateField HeaderText="Publication Dates" > 
        <ItemTemplate> 
        <asp:DropDownList runat="server" ID="ddPublicationDates"  DataSourceID="objBooks"  DataTextField ="PublicationDates" >         
        </asp:DropDownList> 
        </ItemTemplate> 
     </asp:TemplateField>   
    </Columns> 
</asp:GridView>