我觉得我确实缺少一些明显的东西。 ：）
C＃ASPX页面，已在最新版本的Chrome中进行测试。
以下是相关代码：
MyItems
JobSearch.aspx.cs（相关部分）：
<plugins>
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<extensions>true</extensions>
<configuration>
<instructions>
<Import-Package>
org.apache.aries.blueprint.web,
*
</Import-Package>
</instructions>
</configuration>
</plugin>
</plugins>
问题：例如，当我运行 http：// server / Jobs / JobSearch？customerid = 22 时，应该将customerID 22加载到下拉列表中顾客。然后应该对该客户进行搜索。它做第一件事，但不做第二件事。
也就是说，我可以看到ID为22的客户已在下拉列表中被自动选择。但是，当我逐步执行PageLoad例程时，它会运行<%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="JobSearch.aspx.cs" Inherits="GCWebForms.Jobs.JobSearch" %>
<asp:Content ID="HeadContent" ContentPlaceHolderID="Head" runat="server">
<style>
a img{border: none;}
ol li{list-style: decimal outside;}
div#container{width: 780px;margin: 0 auto;padding: 1em 0;}
div.side-by-side{width: 100%;margin-bottom: 1em;}
div.side-by-side > div{float: left;width: 50%;}
div.side-by-side > div > em{margin-bottom: 10px;display: block;}
.clearfix:after{content: "\0020";display: block;height: 0;clear: both;overflow: hidden;visibility: hidden;}
</style>
<link rel="stylesheet" href="../Content/chosen.css" />
</asp:Content>
<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">
<div class="body-content">
<div id="searchform" class="simplelayoutform">
<div>
<div>
<asp:label id="lblCustomerSearch" runat="server" Text="Jobs for Customer:" AssociatedControlID="cboCustomerID" />
<asp:DropDownList ID="cboCustomerID" runat="server" class="chzn-select"
DataSourceID="DataSourceCustomer" DataTextField="CustomerName" DataValueField="CustomerID">
</asp:DropDownList>
<gcctl:MyCheckBox ID="chkCustomersShowInactive" Text="Show Inactive?" Checked="false" AutoPostBack="true" runat="server" />
</div>
</div>
[[cut - search results go here]]
</div>
<asp:SqlDataSource ID="DataSourceCustomer" runat="server"
ConnectionString="<%$ ConnectionStrings:MyConnString %>"
SelectCommand="SELECT NULL AS [CustomerID]
, NULL AS [CustomerName]
UNION SELECT [CustomerID]
,[CustomerName]
FROM [dbo].[Customers]
WHERE ((@ShowInactive = 0 AND IsActive = 1) OR (@ShowInactive = 1))
ORDER BY CustomerName">
<SelectParameters>
<asp:ControlParameter Name="ShowInactive" Type="Boolean" ControlID="chkCustomersShowInactive" PropertyName="Checked" />
</SelectParameters>
</asp:SqlDataSource>
</asp:Content>
<asp:Content ID="Content3" ContentPlaceHolderID="JQScripts" runat="server">
<script type="text/javascript">
function fixform() {
if (opener.document.getElementById("PageForm").target != "_blank") return;
opener.document.getElementById("PageForm").target = "";
opener.document.getElementById("PageForm").action = opener.location.href;
}
</script>
<script src="../Scripts/chosen.jquery.js" type="text/javascript"></script>
<script type="text/javascript"> $(".chzn-select").chosen(); $(".chzn-select-deselect").chosen({ allow_single_deselect: true }); </script>
</asp:Content>，并在其中设置namespace GCWebForms.Jobs
{
public partial class JobSearch : System.Web.UI.Page
{
int? iCustomerID;
int? iStaffID;
bool bolIsPostBack = false;
//--------
protected void SetIDs()
{
this.iCustomerID = null;
this.iStaffID = null;
if (Request.QueryString["customerid"] != null) //new customer
{
try
{
this.iCustomerID = Convert.ToInt32(Request.QueryString["customerid"]);
}
catch { }
}
if (Request.QueryString["staffid"] != null) //new customer
{
try
{
this.iStaffID = Convert.ToInt32(Request.QueryString["staffid"]);
}
catch { }
}
if (iCustomerID != null)
{
this.cboCustomerID.SelectedValue = this.iCustomerID.ToString();
}
if (iStaffID != null)
{
this.cboStaffID.SelectedValue = this.iStaffID.ToString();
}
}
//--------
protected void DoSearch()
{
//gvJobsDataSource.SelectParameters["CustomerSearch"].DefaultValue = cboCustomerID.SelectedValue.ToString();
//gvJobsDataSource.SelectParameters["StaffSearch"].DefaultValue = cboStaffID.SelectedValue.ToString();
//gvJobsDataSource.SelectParameters["ShowClosed"].DefaultValue = chkShowClosed.Checked.ToString();
if(string.IsNullOrEmpty(this.cboCustomerID.SelectedValue.ToString()) && string.IsNullOrEmpty(this.cboStaffID.SelectedValue.ToString()))
{
SearchPrompt.Visible = this.bolIsPostBack;
gvJobs.DataSourceID = "gvJobsDataSourceInit";
} else
{
SearchPrompt.Visible = false;
gvJobs.DataSourceID = "gvJobsDataSource";
}
gvJobs.DataBind();
}
//--------
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
SetIDs();
DoSearch();
}
this.bolIsPostBack = true;
}
//--------
protected void btnSearch_Click(object sender, EventArgs e)
{
DoSearch();
}，但是当它运行SetIDs()并将手表放在this.cboCustomerID.SelectedValue = '22'上时，它将返回DoSearch()，因此不会运行搜索。
当我仅将this.cboCustomerID.SelectedValue.ToString()的值设置为''时为什么返回this.cboCustomerID.SelectedValue.ToString()？
非常感谢！