1
我有一个问题，既Checkbox_OnCheckedChanged和Dropdownlist_OnSelectedIndexChanged事件没有触发我的代码后面的相关功能。C＃ASP.NET CheckBox_OnCheckedChanged没有按预期发射
两个控件都绑定到GridView中的值。在从UI引发的第一个OnCheckedChanged或OnSelectedIndexChanged事件中，代码中的函数无误地触发，但是，如果我刷新我的UpdatePanel，例如通过更改GridView中的数据的日期范围并因此加载更多或更少的记录，则OnCheckedChanged和OnSelectedIndexChanged函数不再被调用，但发生了PostBack。
我相信作为重新绑定GridView函数被调用，而不是该函数没有被调用：
private void report_DateChanged(object sender, EventArgs e)
{
// Bind GridView here..
}
但我想不通为什么会这样。
我有一个母版：
namespace ReportingSystemV2.Reporting
{
public partial class Reporting : System.Web.UI.MasterPage
{
protected void Page_Load(object sender, EventArgs e)
{
// Attach to DateChanged Event on DateChange UserControl to Function
DateRangeSelect.dateChanged += new DateRangeSelect.dateChangedEventHandler(dtRgSel_dateChanged);
}
// Declare an event for the content pages
public event EventHandler reportDateChanged;
// Called on a date change event
protected void dtRgSel_dateChanged(object sender, DateChangedEventArgs e)
{
// Raise the event for content pages
if (reportDateChanged != null)
reportDateChanged(this, EventArgs.Empty);
}
}
这MasterPage具有选择我的日期范围内Control ..
的代码为我控制ascx代码的主要部分是：
<%--UpdatePanel to trigger datechange--%>
<asp:UpdatePanel runat="server" ID="UpdatePanelDateChanged" OnLoad="UpdatePanelDateChanged_Load" >
</asp:UpdatePanel>
<%--When the date changes in javascript a postback is called in the updatepanel--%>
__doPostBack('<%=UpdatePanelDateChanged.ClientID %>', null);
而这个控件的主要代码部分是：
// Declare a delegate
public delegate void dateChangedEventHandler(object sender, DateChangedEventArgs e);
// Declare an event for any pages that have the control
public event dateChangedEventHandler dateChanged;
protected virtual void OnDateChanged(DateChangedEventArgs e)
{
dateChangedEventHandler handler = dateChanged;
// Raise the event
if (handler != null)
handler(this, e);
}
protected void UpdatePanelDateChanged_Load(object sender, EventArgs e)
{
// Trigger the controls public event
OnDateChanged(new DateChangedEventArgs(DateTime.Parse(dates[0]), DateTime.Parse(dates[1])));
}
在我的内容页我aspx代码：
<%@ Page Title="Downtime" Language="C#" MasterPageFile="~/Reporting/Reporting.Master" AutoEventWireup="true" CodeBehind="GensetDowntime.aspx.cs" Inherits="ReportingSystemV2.Reporting.GensetDowntime" %>
<%@ MasterType VirtualPath="~/Reporting/Reporting.Master" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ReportingSubContent" runat="server">
<div class="container-fluid">
<asp:UpdatePanel ID="updPanelDowntime" runat="server">
<ContentTemplate>
<div class="row">
<div id="downtimeDiv" runat="server">
<asp:GridView ID="gridDowntime" runat="server" AutoGenerateColumns="False" GridLines="None" CssClass="table table-striped table-condensed"
OnRowDataBound="gridDowntime_RowDataBound"
OnSelectedIndexChanged="gridDowntime_SelectedIndexChanged"
DataKeyNames="ID,ID_Location,iddown,idup,dtdown,dtup,isexempt" EmptyDataText="No exempts in the selected period.">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:TemplateField HeaderText="Exempt?">
<ItemTemplate>
<asp:DropDownList ID="ddlDowntimeExempt" AutoPostBack="true" runat="server"
OnSelectedIndexChanged="ddlDowntimeExempt_SelectedIndexChanged">
<asp:ListItem Value="-1">Unverified</asp:ListItem>
<asp:ListItem Value="1">Yes</asp:ListItem>
<asp:ListItem Value="0">No</asp:ListItem>
</asp:DropDownList>
<asp:Label ID="lblDowntimeExempt" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"isexempt")%>' Visible="false"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Exclude?">
<ItemTemplate>
<asp:CheckBox ID="chkDowntimeExclude" runat="server" Checked='<%#Convert.ToBoolean(Eval("ISEXCLUDED")) %>' OnCheckedChanged="chkDowntimeExclude_CheckedChanged" AutoPostBack="true"/>
</ItemTemplate>
</asp:TemplateField>
<asp:CommandField ShowSelectButton="True" SelectText="Details" />
</Columns>
</asp:GridView>
</div>
</div>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</asp:Content>
最后我对我的内容页面背后的代码是：
protected void Page_PreInit(object sender, EventArgs e)
{
// Attach to UserControl Event on the MasterPage
Master.reportDateChanged += new EventHandler(report_DateChanged);
}
// If the user changes the date lets update the table
private void report_DateChanged(object sender, EventArgs e)
{
// Bind the gridview
}
// Function to be called when the ddl selectedindex is changed, only called on initial page load
protected void ddlDowntimeExempt_SelectedIndexChanged(object sender, EventArgs e)
{
// Applies the values selected in the exempt DDL to the database value
}
// function to be called when the checkbox checked state is change, again only called on the initial page loading - not after a postback
protected void chkDowntimeExclude_CheckedChanged(object sender, EventArgs e)
{
// When the Exclude checkbox is changed, update the Db
}
上面的代码表明，使用JavaScript来trigger的control一个PostBack在UpdatePanel，其中triggers在Control公开事件。 MasterPage具有附加到Control事件的功能，该MasterPage函数会更新一些值并触发可访问我的ContentPage的新事件。 ContentPage将一个函数附加到此MasterPage事件中，并且在更改DateRange时，它将加载GridView的数据并对其进行绑定。
我们想欣赏你的努力，但不是很多人有时间去阅读整个问题。请发布小程序或代码*（尽可能小）*，以便我们可以复制该问题。在制作小代码时，您甚至可以自己找到解决方案。 – Win
我已更新我的代码并尽可能减少它，希望这可以被接受。谢谢 – neilrudds