c# - Radiobuttonlist 事件并不总是触发

Question

我有一个单选按钮列表，其中包含更新搜索功能的 selectedindexchanged 事件。其中一项在 aspx 中指定，其他项是附加的数据绑定(bind)项。无论我将什么设置为默认值，该项目都不会触发该事件。所有其他项目将触发该事件。此外，似乎在选择“死”项目后，该事件根本不会触发。

我怎样才能找到错误并改正？这是当前代码。

编辑:如果简短的版本误导了您，我们深表歉意。我不确定要包括什么。这是整个页面。

所有 aspx:

     <%@ Page Language="C#" MasterPageFile="~/MSDS/MSDS.master" EnableEventValidation="false"
    AutoEventWireup="true" CodeFile="SearchMSDS.aspx.cs" Inherits="MSDS_ByDept" Title="NCLWeb - Search MSDS" %>

<%@ Register Assembly="SqlWhereBuilder" Namespace="UNLV.IAP.WebControls" TagPrefix="cc1" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc2" %>
<asp:Content ID="Content1" ContentPlaceHolderID="PageContent" runat="Server">
    <h2>
        <asp:Label ID="lblTitle" runat="server">Search Active MSDS</asp:Label></h2>
    <table class="style1">
        <tr>
            <td style="width: 435px" valign="top">
                <asp:Panel runat="server" ID="pnlSearch" DefaultButton="btnSearch">
                    <asp:TextBox ID="txtSimpleSearch" runat="server" Width="262px"></asp:TextBox>
                    <asp:Button ID="btnSearch" runat="server" Text="Search" Width="96px" OnClick="btnSearch_Click" />
                    <br />
                    <asp:LinkButton ID="btnAdvSearch" runat="server" OnClick="btnAdvSearch_Click" Font-Size="Small">Show Advanced Search</asp:LinkButton>
                </asp:Panel>
                <asp:Panel ID="pnlAdvSearch" runat="server" Width="635px" DefaultButton="btnRunAdvSearch">
                    <asp:Button ID="btnRunAdvSearch" runat="server" OnClick="btnRunAdvSearch_Click" Text="Advanced Search" />
                    <cc1:SqlWhereBuilder ID="SqlWhereBuilder1" runat="server" ClientCodeLocation="../JavaScripts/SqlWhereBuilder.js"
                        FieldsFile="../ConfigFiles/SearchMSDS.config" OperatorListsFile="../ConfigFiles/SearchMSDS.config"
                        ValueEntryFile="../ConfigFiles/SearchMSDS.config">
                    </cc1:SqlWhereBuilder>
                    <br />
                    <br />
                </asp:Panel>
                <cc2:CollapsiblePanelExtender ID="pnlAdvSearch_CollapsiblePanelExtender" runat="server"
                    CollapseControlID="btnAdvSearch" Collapsed="True" Enabled="True" ExpandControlID="btnAdvSearch"
                    TargetControlID="pnlAdvSearch">
                </cc2:CollapsiblePanelExtender>
            </td>
            <td valign="top">
                <asp:Panel ID="pnlStatus" runat="server">
                    <asp:RadioButtonList ID="rblStatus" runat="server" AppendDataBoundItems="True"
                        AutoPostBack="True" DataSourceID="SqlDataSource1" DataTextField="DisplayValue"
                        DataValueField="Value" OnSelectedIndexChanged="RadioButtonList1_SelectedIndexChanged"
                        RepeatDirection="Horizontal" CellPadding="3" CellSpacing="3" 
                        CausesValidation="True" Visible="True">
                        <asp:ListItem Selected="True">All</asp:ListItem>
                    </asp:RadioButtonList>
                </asp:Panel>
                <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:NCLWebConnectionString %>"
                    SelectCommand="getOptionList" SelectCommandType="StoredProcedure">
                    <SelectParameters>
                        <asp:Parameter DefaultValue="msds_Status" Name="ListName" Type="String" />
                    </SelectParameters>
                </asp:SqlDataSource>
                <asp:UpdatePanel runat="server" ID="upd2">
                    <ContentTemplate>
                        <asp:Button ID="btnExport" runat="server" Text="Export Results" 
                            OnClick="btnExport_Click1" UseSubmitBehavior="False" />
                    </ContentTemplate>
                </asp:UpdatePanel>
            </td>
        </tr>
    </table>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>
            <asp:UpdateProgress ID="UpdateProgress1" runat="server" DisplayAfter="100" DynamicLayout="False">
                <ProgressTemplate>
                    <img src="../images/loading.gif" alt="Loading..." style="text-align: center" />
                    <asp:Label ID="lblProgress" runat="server"></asp:Label></ProgressTemplate>
            </asp:UpdateProgress>
            <asp:GridView ID="gridResults" runat="server" DataSourceID="sqlMSDS" OnRowDataBound="GridView1_RowDataBound"
                AllowPaging="True" PageSize="25" AllowSorting="True" OnSelectedIndexChanged="gridResults_SelectedIndexChanged"
                AutoGenerateColumns="False" EmptyDataText="No matching MSDS Sheets." OnSorted="gridResults_Sorted">
                <Columns>
                    <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" Visible="false"
                        ReadOnly="True" SortExpression="ID" />
                    <asp:BoundField DataField="ChemicalTitle" HeaderText="ChemicalTitle" SortExpression="ChemicalTitle" />
                    <asp:BoundField DataField="Manufacturer" HeaderText="Manufacturer" SortExpression="Manufacturer" />
                    <asp:BoundField DataField="UsageDept" HeaderText="UsageDept" SortExpression="UsageDept" />
                    <asp:BoundField DataField="Notes" HeaderText="Notes" SortExpression="Notes" />
                    <asp:BoundField DataField="Health" HeaderText="Health" visible="false" SortExpression="Health" />
                    <asp:BoundField DataField="Fire" HeaderText="Fire"  visible="false" SortExpression="Fire" />
                    <asp:BoundField DataField="Reactivity" HeaderText="Reactivity"  visible="false" SortExpression="Reactivity" />
                    <asp:BoundField DataField="DateUpdated" HeaderText="DateUpdated" SortExpression="DateUpdated" />
                </Columns>
                <SelectedRowStyle BackColor="Yellow" />
            </asp:GridView>
            <asp:SqlDataSource ID="sqlMSDS" OnSelected="sqlMSDS_OnSelected" runat="server" ConnectionString="<%$ ConnectionStrings:NCLWebConnectionString %>"
                SelectCommand="SELECT [ID]
                                      ,[ChemicalTitle]
                                      ,[Manufacturer]
                                      ,[UsageDept]
                                      ,[Notes]
                                      ,[Health]
                                      ,[Fire]
                                      ,[Reactivity]
                                      ,[DateUpdated]
                                      FROM [msds_Sheets]" OnSelecting="sqlMSDS_Selecting"></asp:SqlDataSource>
        </ContentTemplate>
        <Triggers>
            <asp:AsyncPostBackTrigger ControlID="btnSearch" EventName="Click" />
            <asp:AsyncPostBackTrigger ControlID="btnRunAdvSearch" EventName="Click" />
            <asp:AsyncPostBackTrigger ControlID="rblStatus" EventName="SelectedIndexChanged" />
            <asp:AsyncPostBackTrigger ControlID="btnExport" EventName="Click" />
        </Triggers>
    </asp:UpdatePanel>
    <br />
</asp:Content>

和代码隐藏:

    List<String> safeWords = new List<String>();

protected void Page_Load(object sender, EventArgs e)
{
    pnlStatus.Visible = User.IsInRole("msds_Admin");

    gridResults.DataKeyNames = new String[] { "id" };

    txtSimpleSearch.Focus();

    if (!IsPostBack)
    {
        safeWords.Add("delete");
        safeWords.Add("insert");
        safeWords.Add("update");
        safeWords.Add("set");
        safeWords.Add("exec");
        safeWords.Add("N'");

        sqlMSDS.SelectCommand += " Where status = 0 ";

        Session["Sql"] = sqlMSDS.SelectCommand;

        try
        {
            Session["OriginalSQL"] = sqlMSDS.SelectCommand.Remove(sqlMSDS.SelectCommand.IndexOf("Where"));
        }
        catch (Exception)
        {
            Session["OriginalSQL"] = sqlMSDS.SelectCommand;
        }
    }
}

protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e)
        {
            ((Label)UpdateProgress1.FindControl("lblProgress")).Text = "Searching...";

            if (btnSearch.Visible)
            {
                btnSearch_Click(null, null);

                if (RadioButtonList1.SelectedValue != "All")
                {
                    sqlMSDS.SelectCommand += " And Status = " + RadioButtonList1.SelectedValue;
                }
                else
                {
                    //Somehow force the grid to research using no status parameter
                    sqlMSDS.SelectCommand = Session["Sql"].ToString();
                }
            }
            else
            {
                btnRunAdvSearch_Click(null, null);

                if (RadioButtonList1.SelectedValue != "All")
                {
                    if (sqlMSDS.SelectCommand.Contains("Where"))
                    {
                        sqlMSDS.SelectCommand += " And Status = " + RadioButtonList1.SelectedValue;
                    }
                    else
                    {
                        sqlMSDS.SelectCommand += " Where Status = " + RadioButtonList1.SelectedValue;
                    }
                }
                else
                {
                    //Somehow force the grid to research using no status parameter
                    sqlMSDS.SelectCommand = Session["Sql"].ToString();
                }
            }
        }

Answer 1

这是发生在我身上的事情和解决方法。

我有一个单选按钮列表，它不在更新面板中，但被定义为更新面板的触发器。我也定义了 onselectedindexchanged。 Radiobuttonlist 有第一个 listitem 属性 selected="true"，所以它会在页面加载时默认被选中。然后选择第二个列表项工作正常，回发并更新更新面板。

但是，再次选择第一项不会触发 onselectedindexchanged 事件。使用 Firefox 强大的 Inspect Element 实用程序，我能够确定服务器正在生成 html 元素(仅检查第一个默认列表项)。但是由于单选按钮列表不在更新面板中，所以第二个项目的 checked="checked"属性永远不会写入浏览器，即使客户端第二个单选按钮在视觉上看起来已被选中。因此，当第二次选择原始项目时，onselectedindexchanged 没有触发服务器端，因为新选择的索引已经在 POST 事件中指示为已选择。

如果列表位于要刷新的面板内，则不会出现此问题，因为回发会导致浏览器在新选择的项目上接收带有 checked="checked"的"new"元素。我的页面布局使得将它们放在同一个面板中很不方便，所以我的解决方法是将单选按钮列表放在它自己的小更新面板中。无论哪个适合您，答案是确保单选按钮列表在某些更新面板中，以便在选择时可以将每个项目的选中属性发送到浏览器。