我正在构建一个自定义控件，但我遇到的问题是渲染是在PreRender上执行的，其中事件在生命周期中更快地连线，因此事件处理程序无法处理触发事件。我需要在事件可以在页面生命周期中处理的Init上连接事件。
我尝试在预渲染阶段之外初始化渲染对象，然后在该阶段添加对象但是失败，因为对象是通过foreach循环动态创建的，因此初始化对象不是创造得当。
因此，我的问题是，有一种方法可以在onInit阶段为预呈现阶段呈现的控件连接一个事件吗？
以下是控件的来源：
public class DayView : Panel, INamingContainer
{
private DateTime _sd;
public DateTime StartDate
{
get { return _sd; }
set { _sd = value; }
}
public string LogoPath { [UsedImplicitly] private get; set; }
public string InnerDCls { [UsedImplicitly] private get; set; }
public string FsCCls { [UsedImplicitly] private get; set; }
public string LegCCls { [UsedImplicitly] private get; set; }
public string FieldClasses { [UsedImplicitly] private get; set; }
protected override void AddAttributesToRender(HtmlTextWriter writer)
{
writer.AddAttribute("ID", ClientID);
base.AddAttributesToRender(writer);
}
public delegate void EPlannerEventHandler(object source, EventDataEventArgs args);
public event EPlannerEventHandler FirstHalfAm;
public event EPlannerEventHandler SecondHalfAm;
public event EPlannerEventHandler FirstHalfPm;
public event EPlannerEventHandler SecondHalfPm;
protected override void OnInit(EventArgs e)
{
Page.RegisterRequiresControlState(this);
base.OnInit(e);
}
private void DayPlanner()
{
var daysInWeek = new List<DateTime>();
for (var i = 0; i < 7; i++)
{
daysInWeek.Add(StartDate.AddDays(i));
}
var containerTbl = new Table { CssClass = "ct_cls" };
var containerRow = new TableRow();
foreach (var day in daysInWeek)
{
var containerCell = new TableCell();
containerCell.CssClass = "cc_cls";
var weekTbl = new Table();
weekTbl.Style.Add("width", "100%");
weekTbl.CssClass = "tblDplan_cls";
var weekdayRow = new TableRow();
var weekdayCell = new TableCell();
weekdayCell.ColumnSpan = 2;
weekdayCell.CssClass = "dayPlan_cls";
try
{
weekdayCell.Controls.Add(new LiteralControl(day.ToString("ddd, MMMM dd, yyyy")));
}
catch (HttpException)
{
Debug.Assert(weekdayCell.HasControls());
}
catch (ArgumentNullException argumentNullException)
{
Console.WriteLine(new ArgumentNullException(argumentNullException.Message));
}
weekdayRow.Cells.Add(weekdayCell);
weekTbl.Rows.Add(weekdayRow);
foreach (var hours in DateExtensions.HoursInDay())
{
var hourRow = new TableRow();
var hourCell = new TableCell();
hourCell.CssClass = "hour_cls";
hourCell.RowSpan = 2;
try
{
hourCell.Controls.Add(new LiteralControl(hours + "am"));
}
catch (HttpException httpException)
{
Console.WriteLine(httpException.Message);
}
hourRow.Cells.Add(hourCell);
var firstHalfAm = new TimeLink
{
TlCssClass = "hour2_cls",
Identifier = day.Day,
WeekDate = day,
Date = day,
Time = hours + ":00" + "am"
};
firstHalfAm.DayLink += FirstHalfAm_DayLink;
hourRow.Cells.Add(firstHalfAm);
weekTbl.Rows.Add(hourRow);
var hourhalfRow = new TableRow();
var secondHalfAm = new TimeLink
{
TlCssClass = "hour2_cls",
Identifier = day.Day,
WeekDate = day,
Date = day,
DisplayLabel = "30",
Time = hours + ":30" + "am"
};
secondHalfAm.DayLink += SecondHalfAm_DayLink;
hourhalfRow.Cells.Add(secondHalfAm);
weekTbl.Rows.Add(hourhalfRow);
}
foreach (var hourpm in DateExtensions.HoursInDay())
{
var hourRow = new TableRow();
var hourCell = new TableCell();
hourCell.RowSpan = 2;
hourCell.CssClass = "hour_cls";
try
{
hourCell.Controls.Add(new LiteralControl(hourpm + "pm"));
}
catch (HttpException httpException)
{
Console.WriteLine(httpException.Message);
}
hourRow.Cells.Add(hourCell);
var firstHalfPm = new TimeLink
{
TlCssClass = "hour2_cls",
Identifier = day.Day,
WeekDate = day,
Date = day,
Time = hourpm + ":00" + "pm"
};
firstHalfPm.DayLink += FirstHalfPm_DayLink;
hourRow.Cells.Add(firstHalfPm);
weekTbl.Rows.Add(hourRow);
var hourhalfRow = new TableRow();
var secondHalfPm = new TimeLink
{
TlCssClass = "hour2_cls",
Identifier = day.Day,
WeekDate = day,
Date = day,
DisplayLabel = "30",
Time = hourpm + ":30" + "pm"
};
secondHalfPm.DayLink += SecondHalfPm_DayLink;
hourhalfRow.Cells.Add(secondHalfPm);
weekTbl.Rows.Add(hourhalfRow);
}
try
{
containerCell.Controls.Add(weekTbl);
}
catch (HttpException httpException)
{
Console.WriteLine(httpException.Message);
}
containerRow.Cells.Add(containerCell);
}
daysInWeek.Clear();
containerTbl.Rows.Add(containerRow);
try
{
Controls.Add(containerTbl);
}
catch (HttpException httpException)
{
Console.WriteLine(httpException.Message);
}
}
protected override void OnPreRender(EventArgs e)
{
DayPlanner();
base.OnPreRender(e);
}
private void SecondHalfPm_DayLink(object source, EventDataEventArgs args) => SecondHalfPm?.Invoke(source, args);
private void FirstHalfPm_DayLink(object source, EventDataEventArgs args) => FirstHalfPm?.Invoke(source, args);
private void SecondHalfAm_DayLink(object source, EventDataEventArgs args) => SecondHalfAm?.Invoke(source, args);
private void FirstHalfAm_DayLink(object source, EventDataEventArgs args) => FirstHalfAm?.Invoke(source, args);
protected override object SaveControlState()
{
return StartDate;
}
protected override void LoadControlState(object state)
{
if (state != null)
{
StartDate = (DateTime)state;
}
}
}
DayPlanner()是一个只是渲染过程容器的方法。在整个过程中移动更容易;
答案 0 :(得分：0)
由于您正在构建服务器端表和其他控件，因此您必须在PreRender之前构建此UI;通常情况发生在Init ...但是MS在构建CompositeControl base class时考虑到了这一点。这可能是一个更好的选择。