DateTable导出添加时间段

--定义字段  
 String mCostStartDate = RequestHelper.GetQueryString("CostStartDate");
    String mCostEndDate = RequestHelper.GetQueryString("CostEndDate");

--带上字段
    mDicInputParam.Add(new DbParam("CostStartDate", mCostStartDate));
    mDicInputParam.Add(new DbParam("CostEndDate", mCostEndDate));
--时间选择不显示缺少的JS引用
    <%=HtmlControlHelper.GetRelJs(ResolveUrl("~/Res/Datepicker/WdatePicker.js"))%>
--导出时的参数不能少
 $('#btnExport').click(function () {
                         var mCostStartDate = document.getElementById("CostStartDate").value;
                         var mCostEndDate = document.getElementById("CostEndDate").value;
                         var sUrl = "<%=RequestHelper.GetPageName()%>?IsExport=1&CostStartDate="+mCostStartDate+"&CostEndDate="+mCostEndDate;
                         window.open(sUrl);
                         return false;
                     });
--查询参数要正确
$('#btnQuery').click(function () {
                         var mCostStartDate = $('#CostStartDate').val();
                         var mCostEndDate = $('#CostEndDate').val();
                         var sUrl = "<%=RequestHelper.GetPageName() %>?CostStartDate=" + mCostStartDate + "&CostEndDate=" + mCostEndDate;
                         location.href = sUrl;
                         return false;
                     });

--选择框
 <table>
        <tr>
            <td style="padding-left: 4px; width: 80px;">
                开始时间：
            </td>
            <td>
                <%=HtmlControlHelper.GetDateTime("CostStartDate", mCostStartDate, "", "")%>
            </td>
            <td>
                结束时间：
            </td>
            <td>
                <%=HtmlControlHelper.GetDateTime("CostEndDate", mCostEndDate, "", "")%>
            </td>
            <td>
                <%=HtmlControlHelper.GetHrefInfo("btnQuery", "查询", "Javascript:void(0);", "toolMenu", "")%>
            </td>
        </tr>
    </table>

--存储过程条件要正确，4种情况：前为空，后为空，两者都为空，两者都不为空
WHERE (Asset_Contract_ChargePlan.CostStartDate between @pi_CostStartDate and @pi_CostEndDate or @pi_CostStartDate='' or @pi_CostEndDate='')