C# Repeater嵌套循环[通俗易懂]

<asp:Repeater ID="rptList" runat="server" OnItemDataBound="users_list">
            <HeaderTemplate>
                <table width="100%" border="0" cellspacing="0" cellpadding="0" class="ltable">
                    <thead>
                        <tr>
                            <th style="width: 80px;">
                                主表字段
                            </th>
                            <th style="width: 320px;">
                                <table width="100%" border="0" cellpadding="5" cellspacing="1">
                                    <tr bgcolor="#FFFFFF">
                                        <th width="50%">
                                            <div align="center">
                                                <font>对应字段1</font></div>
                                        </th>
                                        <th width="50%">
                                            <div align="center">
                                                <font>对应字段1</font></div>
                                        </th>
                                    </tr>
                                </table>
                            </th>
                            <th style="width: 100px;">
                                <i class="iconfont icon-setting bigger"></i>操作
                            </th>
                        </tr>
                    </thead>
            </HeaderTemplate>
            <ItemTemplate>
                <tr>
                    <td>
                        主表数据
                    </td>
                    <td>
                        <table width="100%" border="0">
                            <asp:Repeater ID="users_list" runat="server">
                                <ItemTemplate>
                                    <tr bgcolor="#FFFFFF">
                                        <td width="50%" align="center">
                                            对应数据1
                                        </td>
                                        <td width="50%" align="center">
                                            对应数据2
                                        </td>
                                    </tr>
                                </ItemTemplate>
                            </asp:Repeater>
                        </table>
                    </td>
                    <td>
                       <a href="#">修改</a>
                       <a href="#">查看</a>
                    </td>
                </tr>
            </ItemTemplate>
            <FooterTemplate>
                <%#rptList.Items.Count == 0 ? "<tr><td align=\"center\" colspan=\"3\"><font color=\"#F89406\">暂无记录</font></td></tr>" : ""%>
                </table>
            </FooterTemplate>
        </asp:Repeater>

      	//主表数据绑定
        private void RptBind(string _strWhere, string _orderby)
        { 
   
            BLL.xs_user bll = new BLL.xs_user();
            this.rptList.DataSource = bll.GetList(this.pageSize, this.page, _strWhere, _orderby, out this.totalCount, "manager_qualification_certificate");
            this.rptList.DataBind();
        }

        //副表数据绑定
        protected void users_list(object sender, RepeaterItemEventArgs e)
        { 
   
            if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
            { 
   
                string ID = ((DataRowView)e.Item.DataItem).Row["ID"].ToString();//获得对应ID
                Repeater repeater= (Repeater)e.Item.FindControl("users_list");//找到要绑定数据的Repeater
                //Literal Lit = ((Literal)e.Item.FindControl("Lit_cn"));
                //Literal Lit_remark = ((Literal)e.Item.FindControl("Lit_remark"));

                if (repeater!= null)
                { 
   
                    DataTable dt = 获取到的数据;

                    //string remark = "";
                    //foreach (DataRow item in dt.Rows)
                    //{ 
   
                    // if (!string.IsNullOrWhiteSpace(item["u_remark"].ToString()))
                    // { 
   
                    // remark += item["name"].ToString() + "：" + item["u_remark"].ToString() + "。";
                    // }
                    //}

                    //Lit_remark.Text = remark + Lit_remark.Text;
                    repeater.DataSource = dt;
                    repeater.DataBind();
                }
            }
        }