Repeater实现颜色交替

 <table cellpadding="0" cellspacing="1" border="0" width="100%" style="background-color:#efefef">
                        <tr>
                            <td class="tdCenter">讨论组</td>
                            <td class="tdCenter">创建时间</td>
                            <td class="tdCenter">是否可用</td>
                            <td class="tdCenter">编辑</td>
                        </tr>
                        <asp:Repeater ID="rptOrg" runat="server" OnItemCommand="rptOrg_ItemCommand" OnItemDataBound="rptOrg_ItemDataBound">
                            <ItemTemplate>
                                <tr id="trOrgInfo" runat="server">
                                    <td class="tdRpt" align="center">
                                        <asp:HyperLink ID="HypOrg" runat="server" Font-Size="12px"></asp:HyperLink>
                                    </td>
                                    <td class="tdRpt">
                                        <asp:Label ID="lblInsertTime" runat="server" Font-Size="12px"></asp:Label>
                                    </td>
                                    <td class="tdRpt">
                                        <asp:Label ID="lblIsReal" runat="server" Font-Size="12px"></asp:Label>
                                    </td>
                                     <td class="tdRpt">
                                        <asp:LinkButton ID="lbtnDel" runat="server" Font-Size="12px" Text="删除"></asp:LinkButton>
                                    </td>
                                </tr>
                            </ItemTemplate>
                        </asp:Repeater>
                    </table>



  protected void rptOrg_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
        if (e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item)
        {
            string OrgID = DataBinder.Eval(e.Item.DataItem, "DisOrg_Id").ToString();
            string IsReal = DataBinder.Eval(e.Item.DataItem, "DisOrg_IsReal").ToString();
            ((HyperLink)e.Item.FindControl("HypOrg")).Text = DataBinder.Eval(e.Item.DataItem, "DisOrg_Name").ToString();
            ((HyperLink)e.Item.FindControl("HypOrg")).NavigateUrl = "OnlineT_OrgEdit.aspx?Edit=Update&OrgID="
                + OrgID;
            ((Label)e.Item.FindControl("lblInsertTime")).Text = DataBinder.Eval(e.Item.DataItem, "DisOrg_InsertTime").ToString();
            if (IsReal == "1")
            {
                ((Label)e.Item.FindControl("lblIsReal")).Text = "可用";
            }
            else
            {
                ((Label)e.Item.FindControl("lblIsReal")).Text = "不可用";
            }
            LinkButton lbtnDel = (LinkButton)e.Item.FindControl("lbtnDel");

            lbtnDel.OnClientClick = "javascript:return confirm('您确定要删除该项么?')";
            lbtnDel.CommandName = "Delete";
            lbtnDel.CommandArgument = OrgID;
          
            int i = e.Item.ItemIndex % 2;
            if (i == 0)
            {
                ((HtmlTableRow)e.Item.FindControl("trOrgInfo")).BgColor = "#ffffff";
            }
            else
            {
                ((HtmlTableRow)e.Item.FindControl("trOrgInfo")).BgColor = "#f9f9f9";
            }
        }
    }