根据Eval()函数绑定的值,来显示GridView中的控件的方法

<asp:templatefield headertext="操作" showheader="false">
                                <itemtemplate>
                                <asp:linkbutton id="btn_zhiding" runat="server" commandname="tranfer" commandargument='<%#eval("article_id")%>' text='<%#eval("betop") == "置顶" ? "取消置顶":"置顶" %>' oncommand="rowcommand"></asp:linkbutton>
                               <asp:placeholder id="placeholder1"  runat="server" visible='<% #eval("betop") == "置顶"%>'>
                                <asp:imagebutton id="imgbtn_orderup" runat="server" imageurl="~/pic/向上.jpg" commandname="orderup"
                                        commandargument='<% #eval("article_id") %>' oncommand="rowcommand" />
                                    <asp:imagebutton id="imgbtn_orderdown" runat="server" imageurl="~/pic/向下.jpg" commandname="orderdown"
                                        commandargument='<% #eval("article_id") %>' oncommand="rowcommand" />
                                     </asp:placeholder>
                                </itemtemplate>

                                <itemstyle horizontalalign="center"/>
                            </asp:templatefield>

根据绑定的值，动态显示gridview中每一行中的控件，

用<asp:placeholder runat="server" visible='<% #eval("betop") == "置顶"%>'>