asp.net在Repeater嵌套的Repeater中使用复选框详解

<%--顶层repeater--%>
        <asp:repeater id="rptchannel" runat="server">
            <itemtemplate>
             <br /><b><%# eval("channelname")%></b>
             <%--嵌套的repeater,指定使用后台创建的releation来获取数据源--%>
              <asp:repeater id="rptclassify" datasource='<%# eval("myrelation") %>' runat="server">
                <itemtemplate>
                  <input type="checkbox" id="chk_flagid" value='<%# eval("flagid")%>' runat="server" />
                  <asp:label id="lbl_flagname" runat="server" text='<%# eval("flagname")%>'></asp:label>
                </itemtemplate>
              </asp:repeater >
             <%--end 嵌套的repeater,指定使用后台创建的releation来获取数据源--%>
            </itemtemplate>
        </asp:repeater >
        <%--end 顶层repeater--%>

#region repeater嵌套的repeater中使用复选框
      //★repeater嵌套-经典运用★
      string sqlstr1, sqlstr2;
      sqlstr1 = "select distinct a.channelid,b.channelname from ie_flaggroup a left join ie_channel b on a.channelid=b.channelid where a.isclose=0 order by a.channelid asc";
      sqlstr2 = "select * from ie_flaggroup where isclose=0 order by flagid asc";
      dataset dschannel = dbfun.datasettwo(sqlstr1, "channel", sqlstr2, "classify", "myrelation");
      dschannel.relations.add("myrelation", dschannel.tables["channel"].columns["channelid"], dschannel.tables["classify"].columns["channelid"], false);
      this.rptchannel.datasource = dschannel.tables["channel"];//绑定顶层repeater（注意：只要绑定顶层就好，嵌套层不能绑定）
      this.rptchannel.databind();
      #endregion

//……略相关数据库操作代码

#region 设置repeater嵌套的repeater中相应的复选框为选中状态
          string[] selteamflag = drw["teamflag"].tostring().split(',');
          htmlinputcheckbox checkbox;
          repeater rpclass;

          for (int i = 0; i < this.rptchannel.items.count; i++)
          {
            rpclass = (repeater)this.rptchannel.items[i].findcontrol("rptclassify");
            for (int j = 0; j < rpclass.items.count; j++)
            {
              checkbox = (htmlinputcheckbox)rpclass.items[j].findcontrol("chk_flagid");
              if (selteamflag.contains(checkbox.value))
                checkbox.checked = true;
            }
          }
          #endregion

#region 获取repeater嵌套的repeater中的复选框所选择的值的组合,以","隔开
    string str_teamflag = "";
    htmlinputcheckbox checkbox;
    repeater rpclass;

    for (int i = 0; i < this.rptchannel.items.count; i++)
    {
      rpclass = (repeater)this.rptchannel.items[i].findcontrol("rptclassify");
      for (int j = 0; j < rpclass.items.count; j++)
      {
        checkbox = (htmlinputcheckbox)rpclass.items[j].findcontrol("chk_flagid");
        if (checkbox.checked)
          str_teamflag += checkbox.value + ",";
      }
    }

    if (str_teamflag != "")
    {
      //去除最后一个字符
      //str_teamflag = str_teamflag.substring(0, str_teamflag.length - 1);
      str_teamflag = str_teamflag.remove(str_teamflag.length - 1);
    }
    #endregion