前台的if 和else

Question

 
如果Eval("approve_content")有值时，就显示
<tr>
                                        <td colspan="3" style="text-align:left" class="lbr"><%#Eval("approve_content") %></td>
                                            </tr>
这样在前台得怎么写的?

Answer 1

approve_content==null?"":approve_content
这样可以吗

Answer 2

简单啊!!  搞个隐藏表单域。把Eval("approve_content") 赋给它，然后写 ASP.net代码获得表单域值，进行判断。 如果有值就显示，没有就不显示啊！！
<%
 if(this.隐藏表单域.value != "")
{
%>
<tr> 
                                        <td colspan="3" style="text-align:left" class="lbr"> <%#Eval("approve_content") %> </td> 
                                            </tr> 
<%
}
%>

Answer 3

  <asp:GridView ID="GridView3" runat="server" AutoGenerateColumns="false" Width="100%"  GridLines="none" ShowHeader="true" >
                                 <Columns>
                                 
                                 
                                 
   
                                
                                
                                 <asp:TemplateField>
                                 <HeaderTemplate>
                                 <table width="100%" border="0" cellpadding="0" cellspacing="0">
                                  <tr>
                                      <td style="width:5%" class="tlb">序号</td>
                                      <td style="width:5%" class="tlb">类型</td>
                                      <td style="width:30%" class="tlb">人员</td>
                                      <td style="width:30%" class="tlb">时间</td>
                                      <td style="width:30%" class="tblr">部门</td>
                                  </tr>
                                  </table>
                                 </HeaderTemplate>
                                 <ItemTemplate>
                                     <table width="100%" border="0" cellpadding="0" cellspacing="0">                                    
                                         <tr>
                                      如果 approve_content有值时   
                                    <td width="13" rowspan="2" style="width:5%" class="leftbottom"><%#Eval("seq") %></td>
　　　　　　　　　　　　　　　　　　　　　　否则 <td width="13"  style="width:5%" class="leftbottom"><%#Eval("seq") %></td>
 如果 approve_content有值时
                                        <td  rowspan="2" style="width:5%" class="leftbottom"><%#Eval("kind") %></td>
否则
<td   style="width:5%" class="leftbottom"><%#Eval("kind") %></td>                                         <td  style="width:30%" class="leftbottom"> <%#Eval("idno") %>/<%#Eval("cname") %>/<%#Eval("dutyname") %></td>
                                          <td  style="width:30%" class="leftbottom"><%#Eval("uptime") %></td>
                                         <td  style="width:30%" class="lbr"><%#Eval("departname") %></td>
                                        </tr>
                             如果 approve_content有值时  
                                       <tr>                                        <td colspan="3" style="text-align:left" class="lbr"><%#Eval("approve_content") %></td>
                                            </tr>                                           
                                           </table>
                                 </ItemTemplate>
                                 
                                 </asp:TemplateField>
                                
                                
                                
                                
                                
                                 </Columns>
                                 <HeaderStyle  HorizontalAlign="center"/>
                                 <RowStyle  HorizontalAlign="center"/>
                                 </asp:GridView>