Asp.net 如何使用已传递的参数值自动更新SqlDataSource，以更新DropDownList，使其在；第页“加载”；
用户希望在首次显示ASPX页面时自动显示MVC页面上所选设备的数据。我遇到的问题是，我得到的DropDownList值和列标题显示在Page_Load上，但是，图表和GridView数据没有显示请求的数据 我正在通过MVC页面上的ActionLink单击将设备参数传递到ASPX页面，并将该值设置到DropDownList中。中的SelectedValue（1）！我回来了。DropDownList值用作列标题，但在多个SqlDataSource SelectCommands中也用作输入控制参数。这些查询的结果用于创建折线图和GridView表，但不显示数据 ASPX页面也是一个独立页面，在没有初始参数的情况下可以正常工作。通过一个参数，它最终将在回发事件发生时显示数据；例如，当数据刷新计时器启动时。由于SqlDataSource命令返回回发时请求的数据，我认为我需要在初始页面加载期间以某种方式使所有SqlDataSource在服务器上“运行”。（仅对当前的SqlDataSource进行数据绑定并不能将其删除。） 到目前为止，我还没有找到如何做到这一点。有人能给我指一个链接，解释如何这样做，向他们自己解释，或者告诉我“正确”的解决方案是什么/在哪里（如果我完全偏离了基准） 以下是我到目前为止的情况： MVC ActionLink到带有设备参数的ASPX页面：Asp.net 如何使用已传递的参数值自动更新SqlDataSource，以更新DropDownList，使其在；第页“加载”；,asp.net,parameter-passing,sqldatasource,aspxgridview,page-load-time,Asp.net,Parameter Passing,Sqldatasource,Aspxgridview,Page Load Time,用户希望在首次显示ASPX页面时自动显示MVC页面上所选设备的数据。我遇到的问题是，我得到的DropDownList值和列标题显示在Page_Load上，但是，图表和GridView数据没有显示请求的数据 我正在通过MVC页面上的ActionLink单击将设备参数传递到ASPX页面，并将该值设置到DropDownList中。中的SelectedValue（1）！我回来了。DropDownList值用作列标题，但在多个SqlDataSource SelectCommands中也用作输入控制参数。这
<div style="max-height:335px;overflow:auto;">
<table class="table table-bordered table-condensed table-striped">
@foreach (var item in Model)
{
<tr>
<td>
@*@Html.DisplayFor(modelItem => item.CIRCUIT)*@
@Html.ActionLink(item.CIRCUIT, null, "AmpLoadDaily", new { device = item.CIRCUIT }, null)
</td>
预期结果是在“页面加载”上自动显示用户的结果，而不是让用户引起回发或必须等待屏幕的计时器刷新。以下添加到ASPX页面的“回发”功能似乎用于在“页面加载”期间显示图表和网格数据。（在页面加载期间，它可能不会实际导致回发，但所选数据会在页面首次显示之前进行处理。）
如果（'False'=''）
{
__doPostBack（）；
}
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:Timer ID="Timer1" runat="server" Interval="90000" OnTick="Timer1_Tick">
</asp:Timer>
<asp:DropDownList runat="server" ID="ddlDevice1" DataSourceID ="SqlDataSource_ddlDevice1" DataTextField="CIRCUIT" DataValueField="CIRCUIT"
AppendDataBoundItems="true" AutoPostBack="true" Width="95" OnSelectedIndexChanged="ddlDevice1_SelectedIndexChanged">
<asp:ListItem Text="-Device1-" Value=" " Selected="True">
</asp:ListItem>
</asp:DropDownList>
<div class="auto-style1">
<span class="auto-style4">
<strong>Amp Load - Daily
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
<ContentTemplate>
<asp:Chart ID="Chart1" runat="server" Width="900px" Height="500px">
<Series>
<asp:Series ChartType="Spline" Name="ALL IA" XValueMember="Times" YValueMembers="ALL IA" Color="Red" BORDERWidth="2">
</asp:Series>
<asp:Series ChartType="Spline" Name="ALL IB" XValueMember="Times" YValueMembers="ALL IB" Color="Green" BORDERWidth="2">
</asp:Series>
<asp:Series ChartType="Spline" Name="ALL IC" XValueMember="Times" YValueMembers="ALL IC" Color="Blue" BORDERWidth="2">
</asp:Series>
</Series>
<ChartAreas>
<asp:ChartArea Name="ChartArea1">
<AxisY Enabled="True" Interval="10" Title="AMPS" TitleFont="Times New Roman, 14.25pt" LineColor="RoyalBlue" TitleForeColor="#0033CC">
<MajorGrid Interval="10" />
<LabelStyle ForeColor="Blue" />
</AxisY>
<AxisX Interval="12" IsLabelAutoFit="False" Enabled="TRUE" IntervalOffset="1">
<MajorGrid Interval="4" IntervalOffset="1" />
<LabelStyle IntervalOffset="1" />
</AxisX>
</asp:ChartArea>
</ChartAreas>
<Legends>
<asp:Legend Alignment="Center" BackImageAlignment="TopRight" Docking="Bottom" Name="Legend1"></asp:Legend>
</Legends>
</asp:Chart>
</ContentTemplate>
</asp:UpdatePanel>
</strong>
</span>
<td class="auto-style6">
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
<ContentTemplate>
<%= ddlDevice1.SelectedValue %>
</ContentTemplate>
</asp:UpdatePanel>
</td>
<td>
<asp:UpdatePanel ID="UpdatePanel32" runat="server">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</Triggers>
<ContentTemplate>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" GridLines="None" ShowHeader="False" CssClass="auto-style7" >
<Columns>
<asp:BoundField DataField="Value" HeaderText="Value" ReadOnly="True" SortExpression="Value" ItemStyle-ForeColor="Red"/>
</Columns>
</asp:GridView>
</ContentTemplate>
</asp:UpdatePanel>
</td>
<asp:SqlDataSource ID="SqlDataSource_Chart" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString2 %>"
SelectCommand="SELECT FORMAT(CONVERT(DATETIME,T.[Time_values]), 'hh:mm tt') AS [Times],
SUM(C.[IA]) AS [ALL IA],
SUM(C.[IB]) AS [ALL IB],
SUM(C.[IC]) AS [ALL IC]
FROM [SCADA].[dbo].[TIMEVALUES] T
LEFT OUTER JOIN
(SELECT FORMAT([RUNTIME],'hh:mm tt') AS [TIME],
[IA],
[IB],
[IC]
FROM [CIRCUITS1DAY]
WHERE FORMAT([RUNTIME], 'yyyy/MM/dd') = FORMAT(GETDATE(), 'yyyy/MM/dd') AND
([CIRCUIT]=@ddlDevice1 OR [CIRCUIT]=@ddlDevice2 OR [CIRCUIT]=@ddlDevice3 OR [CIRCUIT]=@ddlDevice4 OR
[CIRCUIT]=@ddlDevice5 OR [CIRCUIT]=@ddlDevice6 OR [CIRCUIT]=@ddlDevice7 OR [CIRCUIT]=@ddlDevice8 OR
[CIRCUIT]=@ddlDevice9 OR [CIRCUIT]=@ddlDevice10 OR [CIRCUIT]=@ddlDevice11 OR [CIRCUIT]=@ddlDevice12 OR
[CIRCUIT]=@ddlDevice13 OR [CIRCUIT]=@ddlDevice14 OR [CIRCUIT]=@ddlDevice15 OR [CIRCUIT]=@ddlDevice16 OR
[CIRCUIT]=@ddlDevice17 OR [CIRCUIT]=@ddlDevice18 OR [CIRCUIT]=@ddlDevice19 OR [CIRCUIT]=@ddlDevice20 OR
[CIRCUIT]=@ddlDevice21 OR [CIRCUIT]=@ddlDevice22 OR [CIRCUIT]=@ddlDevice23 OR [CIRCUIT]=@ddlDevice24 OR
[CIRCUIT]=@ddlDevice25 OR [CIRCUIT]=@ddlDevice26 OR [CIRCUIT]=@ddlDevice27 OR [CIRCUIT]=@ddlDevice28 OR
[CIRCUIT]=@ddlDevice29 OR [CIRCUIT]=@ddlDevice30)) C
ON
FORMAT(CONVERT(DATETIME,T.[Time_values]), 'hh:mm tt') = C.[TIME]
GROUP BY CONVERT(DATETIME,T.[Time_values])">
<SelectParameters>
<asp:ControlParameter ControlID="ddlDevice1" PropertyName="SelectedValue" Name="ddlDevice1" Type="String" />
<asp:ControlParameter ControlID="ddlDevice2" PropertyName="SelectedValue" Name="ddlDevice2" Type="String" />
<asp:ControlParameter ControlID="ddlDevice3" PropertyName="SelectedValue" Name="ddlDevice3" Type="String" />
<asp:ControlParameter ControlID="ddlDevice4" PropertyName="SelectedValue" Name="ddlDevice4" Type="String" />
<asp:ControlParameter ControlID="ddlDevice5" PropertyName="SelectedValue" Name="ddlDevice5" Type="String" />
<asp:ControlParameter ControlID="ddlDevice6" PropertyName="SelectedValue" Name="ddlDevice6" Type="String" />
<asp:ControlParameter ControlID="ddlDevice7" PropertyName="SelectedValue" Name="ddlDevice7" Type="String" />
<asp:ControlParameter ControlID="ddlDevice8" PropertyName="SelectedValue" Name="ddlDevice8" Type="String" />
<asp:ControlParameter ControlID="ddlDevice9" PropertyName="SelectedValue" Name="ddlDevice9" Type="String" />
<asp:ControlParameter ControlID="ddlDevice10" PropertyName="SelectedValue" Name="ddlDevice10" Type="String" />
<asp:ControlParameter ControlID="ddlDevice11" PropertyName="SelectedValue" Name="ddlDevice11" Type="String" />
<asp:ControlParameter ControlID="ddlDevice12" PropertyName="SelectedValue" Name="ddlDevice12" Type="String" />
<asp:ControlParameter ControlID="ddlDevice13" PropertyName="SelectedValue" Name="ddlDevice13" Type="String" />
<asp:ControlParameter ControlID="ddlDevice14" PropertyName="SelectedValue" Name="ddlDevice14" Type="String" />
<asp:ControlParameter ControlID="ddlDevice15" PropertyName="SelectedValue" Name="ddlDevice15" Type="String" />
<asp:ControlParameter ControlID="ddlDevice16" PropertyName="SelectedValue" Name="ddlDevice16" Type="String" />
<asp:ControlParameter ControlID="ddlDevice17" PropertyName="SelectedValue" Name="ddlDevice17" Type="String" />
<asp:ControlParameter ControlID="ddlDevice18" PropertyName="SelectedValue" Name="ddlDevice18" Type="String" />
<asp:ControlParameter ControlID="ddlDevice19" PropertyName="SelectedValue" Name="ddlDevice19" Type="String" />
<asp:ControlParameter ControlID="ddlDevice20" PropertyName="SelectedValue" Name="ddlDevice20" Type="String" />
<asp:ControlParameter ControlID="ddlDevice21" PropertyName="SelectedValue" Name="ddlDevice21" Type="String" />
<asp:ControlParameter ControlID="ddlDevice22" PropertyName="SelectedValue" Name="ddlDevice22" Type="String" />
<asp:ControlParameter ControlID="ddlDevice23" PropertyName="SelectedValue" Name="ddlDevice23" Type="String" />
<asp:ControlParameter ControlID="ddlDevice24" PropertyName="SelectedValue" Name="ddlDevice24" Type="String" />
<asp:ControlParameter ControlID="ddlDevice25" PropertyName="SelectedValue" Name="ddlDevice25" Type="String" />
<asp:ControlParameter ControlID="ddlDevice26" PropertyName="SelectedValue" Name="ddlDevice26" Type="String" />
<asp:ControlParameter ControlID="ddlDevice27" PropertyName="SelectedValue" Name="ddlDevice27" Type="String" />
<asp:ControlParameter ControlID="ddlDevice28" PropertyName="SelectedValue" Name="ddlDevice28" Type="String" />
<asp:ControlParameter ControlID="ddlDevice29" PropertyName="SelectedValue" Name="ddlDevice29" Type="String" />
<asp:ControlParameter ControlID="ddlDevice30" PropertyName="SelectedValue" Name="ddlDevice30" Type="String" />
</SelectParameters>
</asp:SqlDataSource>
namespace Mvc
{
public partial class AmpLoadDaily : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ddlDevice1.SelectedValue = Request.QueryString["device"];
Chart1.DataSource = SqlDataSource_Chart;
Chart1.DataBind();
GridView1.DataSource = SqlDataSource_grdTotal_IA;
GridView1.DataBind();
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<script type="text/javascript">
if ('False' === '<%= Page.IsPostBack.ToString()%>')
{
__doPostBack();
}
</script>
<asp:Timer ID="Timer1" runat="server" Interval="90000" OnTick="Timer1_Tick">
</asp:Timer>
<asp:DropDownList runat="server" ID="ddlDevice1" DataSourceID ="SqlDataSource_ddlDevice1" DataTextField="CIRCUIT" DataValueField="CIRCUIT"
AppendDataBoundItems="true" AutoPostBack="true" Width="95" OnSelectedIndexChanged="ddlDevice1_SelectedIndexChanged">
<asp:ListItem Text="-Device1-" Value=" " Selected="True">
</asp:ListItem>
</asp:DropDownList>