Eval在数据绑定做计算列时一定要转成适当的类型参数

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ProductCatalogID"
        DataSourceID="SqlDataSource1" EmptyDataText="没有可显示的数据记录。" ShowHeader="false" OnRowDataBound="GridView1_RowDataBound" >
        <Columns>
            <asp:TemplateField HeaderText="ProductCatalogID" SortExpression="ProductCatalogID" Visible="false">
                <EditItemTemplate>
                    <asp:Label ID="Label1" runat="server" Text='<%# Eval("ProductCatalogID") %>'></asp:Label>
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="LabelProductCatalogID" runat="server" Text='<%# Bind("ProductCatalogID") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="ProductCatalogName" SortExpression="ProductCatalogName">
                <EditItemTemplate>
                    <asp:Label ID="labCatalogName" runat="server" Text='<%# Bind("ProductCatalogName") %>'></asp:Label>
                    
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label2" runat="server" Text='<%# Bind("ProductCatalogName") %>'></asp:Label>
                     <table>
                     <asp:Repeater ID="RepaterDetail" runat="server">
                    <HeaderTemplate>
                    <tr><td style="width:200px;">品牌</td><td style="width:80px;">BCMI</td><td style="width:80px;">环比</td><td style="width:80px;">BCPI</td><td style="width:80px;">环比</td><td style="width:50px;"></td></tr>
                    </HeaderTemplate>
                    <ItemTemplate>
                    <tr><td><%#Eval("brandname") %></td><td><%#Eval("bcmi") %></td><td><%#Eval("bcmiPct","{0:F2}") %></td><td><%#Eval("bcpi") %></td><td><%#Eval("bcpiPct","{0:F2}") %></td>
                    <td><a href="E_BrandObservDetails.aspx?brandname=<%#Server.UrlEncode(DataBinder.Eval(Container.DataItem,"brandname").ToString())%>&bcmi=<%#Eval("bcmi") %>&bcmiPct=<%#Eval("bcmiPct") %>&bcpi=<%#Eval("bcpi") %>&bcpiPct=<%#Eval("bcpiPct") %>" target="_blank">详细</a></td></tr>
                    </ItemTemplate>
                    </asp:Repeater>
                    </table>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="ParentCatalogID" SortExpression="ParentCatalogID" Visible="false">
                <EditItemTemplate>
                    <asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("ParentCatalogID") %>'></asp:TextBox>
                   
                </EditItemTemplate>
                <ItemTemplate>
                    <asp:Label ID="Label3" runat="server" Text='<%# Bind("ParentCatalogID") %>'></asp:Label>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>