ASPxGridView EditForm ASPxRadioButtonList 报错解决办法

是因为没有指定 ValueType

<dx:ASPxRadioButtonList ID="ASPxRadioButtonListObjectType" runat="server" RepeatDirection="Horizontal"
    ValueType="System.Int32" Value='<%# Bind("ObjectType") %>'>
    <Items>
        <dx:ListEditItem Value="0" Text="全部" />
        <dx:ListEditItem Value="1" Text="学员" />
        <dx:ListEditItem Value="2" Text="教职工" />
    </Items>
</dx:ASPxRadioButtonList>