可能有助于您更好地了解问题的背景知识：
这是我大学初级项目的一部分。我的JP是挥发性有机化合物传感器，但我想创建一个网站，以图形方式查看记录的水平作为额外的奖励。现在情况不是很好，因为我只是先行功能。话虽这么说，我所做的可能不是最好的做法 - 但我愿意接受如何做得更好的建议！我现在有一个2.5级系统 - 我计划很快制作3层。所有5个下拉列表都有一个onselectedindexchange触发器来更新它下面的下拉列表的内容。
Zipcode下拉列表（数据绑定到查询以返回DISTINCT邮政编码列表）
MonitorID下拉列表（数据绑定根据上面选择的邮政编码返回Monitor表中的所有MonitorID。）
年份下拉列表（数据绑定以返回监视器已运行的年份列表。例如，＆＃34; 2013,2014＆＃34;可能会返回并显示在此下拉列表中。）
月份下拉列表（数据绑定以返回基于所选年份可用的月份列表）
一天下拉列表（数据绑定以返回基于所选月份的可用天数列表）
我的问题是，当我选择一年时，我的月日下拉列表没有更新，我不知道为什么。这是graph.aspx.cs代码
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="Graph_Outter_Zip" runat="server">
<ContentTemplate>
Choose a Zip-code:
<asp:DropDownList ID="Graph_DropDownListZip" runat="server" DataSourceID="GetDistinctZip_BL" DataTextField="Zip" DataValueField="Zip" AutoPostBack="True" OnSelectedIndexChanged="Graph_DropDownListZip_SelectedIndexChanged">
</asp:DropDownList>
<asp:ObjectDataSource ID="GetDistinctZip_BL" runat="server" SelectMethod="GetDistinctZip" TypeName="Sentient.WebManager.MonitorLevel_BL"></asp:ObjectDataSource>
<br />
Choose a MonitorID:
<asp:DropDownList ID="Graph_DropDownListMonitor" runat="server" AutoPostBack="True" DataSourceID="GetMonitorIDs" DataTextField="MonitorID" DataValueField="MonitorID">
</asp:DropDownList>
<asp:ObjectDataSource ID="GetMonitorIDs" runat="server" OldValuesParameterFormatString="original_{0}" SelectMethod="GetMonitorIDsFromZip" TypeName="Sentient.WebManager.MonitorLevel_BL">
<SelectParameters>
<asp:ControlParameter ControlID="Graph_DropDownListZip" DefaultValue="97603" Name="zipCode" PropertyName="SelectedValue" Type="String" />
</SelectParameters>
</asp:ObjectDataSource>
<br />
Choose a year/month/day to view:
<div class="yearDD">
Year:<asp:DropDownList ID="GRAPH_yearDropDropList" runat="server" DataSourceID="GetYearFromMonitorID_BL" DataTextField="Year" DataValueField="Year" OnSelectedIndexChanged="GRAPH_yearDropDropList_SelectedIndexChanged"></asp:DropDownList>
<asp:ObjectDataSource ID="GetYearFromMonitorID_BL" runat="server" SelectMethod="GetYearFromMonitorID" TypeName="Sentient.WebManager.MonitorLevel_BL" OldValuesParameterFormatString="original_{0}">
<SelectParameters>
<asp:ControlParameter ControlID="Graph_DropDownListMonitor" DefaultValue="1" Name="MonitorID" PropertyName="SelectedValue" Type="Int32" />
</SelectParameters>
</asp:ObjectDataSource>
</div>
<div class="monthDD">
Month:<asp:DropDownList ID="GRAPH_monthDropDownList" runat="server" DataSourceID="GetMonthFromMonitorID" DataTextField="Month" DataValueField="Month" OnSelectedIndexChanged="GRAPH_monthDropDownList_SelectedIndexChanged"></asp:DropDownList>
<asp:ObjectDataSource ID="GetMonthFromMonitorID" runat="server" SelectMethod="GetMonthFromMonitorID" TypeName="Sentient.WebManager.MonitorLevel_BL">
<SelectParameters>
<asp:ControlParameter ControlID="Graph_DropDownListMonitor" DefaultValue="1" Name="MonitorID" PropertyName="SelectedValue" Type="Int32" />
<asp:ControlParameter ControlID="GRAPH_yearDropDropList" DefaultValue="2014" Name="Year" PropertyName="SelectedValue" Type="String" />
</SelectParameters>
</asp:ObjectDataSource>
</div>
<div class="dayDD">
Day:<asp:DropDownList ID="GRAPH_dayDropDownList" runat="server" DataSourceID="GetDayFromMonitorID" DataTextField="Day" DataValueField="Day" OnSelectedIndexChanged="GRAPH_dayDropDownList_SelectedIndexChanged"></asp:DropDownList>
<asp:ObjectDataSource ID="GetDayFromMonitorID" runat="server" SelectMethod="GetDayFromMonitorID" TypeName="Sentient.WebManager.MonitorLevel_BL" OldValuesParameterFormatString="original_{0}">
<SelectParameters>
<asp:ControlParameter ControlID="Graph_DropDownListMonitor" DefaultValue="1" Name="MonitorID" PropertyName="SelectedValue" Type="Int32" />
<asp:ControlParameter ControlID="GRAPH_yearDropDropList" DefaultValue="2014" Name="Year" PropertyName="SelectedValue" Type="String" />
<asp:ControlParameter ControlID="GRAPH_monthDropDownList" DefaultValue="04" Name="Month" PropertyName="SelectedValue" Type="String" />
</SelectParameters>
</asp:ObjectDataSource>
</div>
<asp:Button ID="ViewGraphBtn" runat="server" Text="View Graph" OnClick="ViewGraphBtn_Click" />
<asp:Chart ID="Graph" runat="server" DataSourceID="LevelAndTime" OnLoad="Graph_Load" Height="500px" Width="500px">
<Series>
<asp:Series Name="Level" ChartType="Line" XValueMember="Time" YValueMembers="Level"></asp:Series>
</Series>
<ChartAreas>
<asp:ChartArea Name="ChartArea1"></asp:ChartArea>
</ChartAreas>
</asp:Chart>
<asp:ObjectDataSource ID="LevelAndTime" runat="server" OnSelecting="LevelAndTime_Selecting" SelectMethod="GetLevelAndTimeFromDate" TypeName="Sentient.WebManager.MonitorLevel_BL" OldValuesParameterFormatString="original_{0}">
<SelectParameters>
<asp:ControlParameter ControlID="Graph_DropDownListMonitor" DefaultValue="1" Name="MonitorID" PropertyName="SelectedValue" Type="Int32" />
<asp:ControlParameter ControlID="GRAPH_yearDropDropList" DefaultValue="2014" Name="Year" PropertyName="SelectedValue" Type="String" />
<asp:ControlParameter ControlID="GRAPH_monthDropDownList" DefaultValue="4" Name="Month" PropertyName="SelectedValue" Type="String" />
<asp:ControlParameter ControlID="GRAPH_dayDropDownList" DefaultValue="13" Name="Day" PropertyName="SelectedValue" Type="String" />
</SelectParameters>
</asp:ObjectDataSource>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Graph_DropDownListZip" EventName="SelectedIndexChanged" />
<asp:AsyncPostBackTrigger ControlID="Graph_DropDownListMonitor" EventName="SelectedIndexChanged" />
<asp:AsyncPostBackTrigger ControlID="GRAPH_yearDropDropList" EventName="SelectedIndexChanged" />
<asp:AsyncPostBackTrigger ControlID="GRAPH_monthDropDownList" EventName="SelectedIndexChanged" />
<asp:AsyncPostBackTrigger ControlID="GRAPH_dayDropDownList" EventName="SelectedIndexChanged" />
</Triggers>
</asp:UpdatePanel>
</div><!--End Content DIV-->
</div><!--End ContentWrapper DIV-->
</form>
这是MonitorLevel_BL.cs业务层类代码。没有太多的业务规则，所以它非常简单。是的我将构造函数硬编码为b / c我很沮丧：）
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Sentient.WebPersistence.VOCMSDataSetTableAdapters;
using Sentient.WebPersistence;
namespace Sentient.WebManager
{
public class MonitorLevel_BL
{
//Constructor
public MonitorLevel_BL()
{
zipCode = "97601";
monitorID = 1;
serialNumber = 0;
vocID = 0;
vocName = "";
protectionInfo = "";
symptomInfo = "";
dangerZone = 0;
year = "2014";
month = "05";
day = "15";
}
private string _zipCode;
private int _monitorID;
private int _serialNumber;
private int _vocID;
private string _vocName;
private string _protectionInfo;
private string _symptomInfo;
private int _dangerZone;
private string _year;
private string _month;
private string _day;
//Setters and Getters
public string zipCode
{
set { _zipCode = value; }
get { return _zipCode; }
}
public int monitorID
{
set { _monitorID = value; }
get { return _monitorID; }
}
public int serialNumber
{
set { _serialNumber = value; }
get { return _serialNumber; }
}
public int vocID
{
set { _vocID = value; }
get { return _vocID; }
}
public string vocName
{
set { _vocName = value; }
get { return _vocName; }
}
public string protectionInfo
{
set { _protectionInfo = value; }
get { return _protectionInfo; }
}
public string symptomInfo
{
set { _symptomInfo = value; }
get { return _symptomInfo; }
}
public int dangerZone
{
set { _dangerZone = value; }
get { return _dangerZone; }
}
public string year
{
set { _year = value; }
get { return _year; }
}
public string month
{
set { _month = value; }
get { return _month; }
}
public string day
{
set { _day = value; }
get { return _day; }
}
public VOCMSDataSet.DistinctZipcodesDataTable GetDistinctZip()
{
DistinctZipcodesTableAdapter distinctZip = new DistinctZipcodesTableAdapter();
return distinctZip.GetDistinctZipcodes();
}
public VOCMSDataSet.SP_GetYearFromMonitorIDDataTable GetYearFromMonitorID(int MonitorID)
{
SP_GetYearFromMonitorIDTableAdapter yearFromMonitorID = new SP_GetYearFromMonitorIDTableAdapter();
return yearFromMonitorID.GetYearFromMonitorID(MonitorID);
}
public VOCMSDataSet.SP_GetMonthFromMonitorIDDataTable GetMonthFromMonitorID(int MonitorID, string Year)
{
SP_GetMonthFromMonitorIDTableAdapter month = new SP_GetMonthFromMonitorIDTableAdapter();
return month.GetMonthFromMonitorID(MonitorID, Year);
}
public VOCMSDataSet.SP_GetDayFromMonitorIDDataTable GetDayFromMonitorID(int MonitorID, string Year, string Month)
{
SP_GetDayFromMonitorIDTableAdapter day = new SP_GetDayFromMonitorIDTableAdapter();
return day.GetDayFromMonitorID(MonitorID, Year, Month);
}
public VOCMSDataSet.SP_GetMonitorIDsFromZipDataTable GetMonitorIDsFromZip(string zipCode)
{
SP_GetMonitorIDsFromZipTableAdapter monitorIDs = new SP_GetMonitorIDsFromZipTableAdapter();
return monitorIDs.GetMonitorIDsFromZip(zipCode);
}
public VOCMSDataSet.SP_GetRawDataToBeDLDataTable GetRawDataToBeDL( int monitorID )
{
SP_GetRawDataToBeDLTableAdapter rawData = new SP_GetRawDataToBeDLTableAdapter();
return rawData.GetRawDataToBeDL(monitorID);
}
public VOCMSDataSet.SP_GetLevelAndTimeFromDateDataTable GetLevelAndTimeFromDate(int MonitorID, string Year, string Month, string Day)
{
SP_GetLevelAndTimeFromDateTableAdapter levelTime = new SP_GetLevelAndTimeFromDateTableAdapter();
return levelTime.GetLevelAndTimeFromDate(MonitorID, Year, Month, Day);
}
}
我已经对持久层进行了单元测试，并且查询返回了正确的信息，因此我不打算发布这些信息。是否存在某些我在年/月/日下拉列表中缺失的设置？