<asp:Repeater ID="Repeater1" runat="server">
<ItemTemplate>
<!--换行开始-->
<%# ((Container.ItemIndex+1) %3 == 0 )? "<br />" :""%>
<!--换行结束-->
</ItemTemplate>
</asp:Repeater>
转载于:https://www.cnblogs.com/wenbo/archive/2011/07/13/2104923.html