objectDataSource deletemethod

<asp:ObjectDataSource ID="GridViewODS" runat="server" TypeName="Gongzhen.Components.BusinessDetails"
    SelectMethod="GetBusinessDetailsByFielID" UpdateMethod="UpdateBusinessDetail"
    DataObjectTypeName="Gongzhen.Components.BusinessDetail" DeleteMethod="DeleteBusinessDetail"
    EnableViewState="False">
    <SelectParameters>
        <asp:Parameter Name="fileID" Type="Int32" />
        <asp:Parameter Name="skinType" Type="Object" />
        <asp:ControlParameter ControlID="BusinessGridView" Name="AddNewDetails" PropertyName="AddNewDetails" />
    </SelectParameters>
    <DeleteParameters>
        <asp:Parameter Name="ID" Type="Int32" />
    </DeleteParameters>
</asp:ObjectDataSource>
在public static CreateStatus DeleteBusinessDetail(BusinessDetail businessDetail)里跟踪时发现这种情况下只有primary key被负值了.