SelectedDatesCollection.Clear Methode
Definitie
Belangrijk
Bepaalde informatie heeft betrekking op een voorlopige productversie die aanzienlijk kan worden gewijzigd voordat deze wordt uitgebracht. Microsoft biedt geen enkele expliciete of impliciete garanties met betrekking tot de informatie die hier wordt verstrekt.
Hiermee verwijdert u alle DateTime objecten uit de verzameling.
public:
void Clear();public void Clear();member this.Clear : unit -> unitPublic Sub Clear ()Voorbeelden
In het volgende codevoorbeeld ziet u hoe u de Clear methode gebruikt om alle System.DateTime objecten uit de SelectedDatesCollection verzameling te verwijderen en deze te vervangen door nieuwe System.DateTime objecten.
<%@ Page Language="C#" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>SelectedDatesCollection Add Example </title>
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
// Initialize the VisibleDate property with today's date when
// the page is first loaded.
if(!IsPostBack)
{
Calendar1.VisibleDate = Calendar1.TodaysDate;
}
}
void Button_Click(Object sender, EventArgs e)
{
// This method demonstrates how to select noncontiguous dates
// in the calendar.
// Get the month and year of the date contained in the
// VisibleDate property.
int CurrentMonth = Calendar1.VisibleDate.Month;
int CurrentYear = Calendar1.VisibleDate.Year;
// Clear all selected dates.
Calendar1.SelectedDates.Clear();
// Iterate through the current month and add all Wednesdays
// to the collection.
for (int i = 1;
i <= System.DateTime.DaysInMonth(CurrentYear, CurrentMonth);
i++)
{
DateTime CurrentDate = new DateTime(CurrentYear, CurrentMonth, i);
if (CurrentDate.DayOfWeek == DayOfWeek.Wednesday)
{
Calendar1.SelectedDates.Add(CurrentDate);
}
}
// Display the number of items selected.
Message.Text = "Selection Count = " +
Calendar1.SelectedDates.Count.ToString();
}
void Selection_Change(Object sender, EventArgs e)
{
// Display the number of items selected.
Message.Text = "Selection Count = " +
Calendar1.SelectedDates.Count.ToString();
}
</script>
</head>
<body>
<form id="form1" runat="server">
<h3>SelectedDatesCollection Add Example </h3>
Click the button to select all Wednesdays in the month.
<br /><br />
<asp:Calendar ID="Calendar1" runat="server"
SelectionMode="DayWeekMonth"
OnSelectionChanged="Selection_Change" />
<hr />
<asp:Button id="SubmitButton"
Text="Select All Weds in Month"
OnClick="Button_Click"
runat="server" />
<br />
<asp:Label id="Message"
runat="server" />
</form>
</body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>SelectedDatesCollection Add Example </title>
<script runat="server">
Sub Page_Load(sender As Object, e As EventArgs)
' Initialize the VisibleDate property with today's date when
' the page is first loaded.
If Not IsPostBack Then
Calendar1.VisibleDate = Calendar1.TodaysDate
End If
End Sub
Sub Button_Click(sender As Object, e As EventArgs)
' This method demonstrates how to select noncontiguous dates
' in the calendar.
' Get the month, day, and year of the date contained in the
' VisibleDate property.
Dim CurrentMonth As Integer = Calendar1.VisibleDate.Month
Dim CurrentYear As Integer = Calendar1.VisibleDate.Year
' Clear all selected dates.
Calendar1.SelectedDates.Clear()
' Iterate through the current month and add all Wednesdays
' to the collection.
Dim i As Integer
For i = 1 To System.DateTime.DaysInMonth(CurrentYear, CurrentMonth)
Dim CurrentDate As DateTime = _
New DateTime(CurrentYear, CurrentMonth, i)
If CurrentDate.DayOfWeek = DayOfWeek.Wednesday Then
Calendar1.SelectedDates.Add(CurrentDate)
End If
Next i
' Display the number of items selected.
Message.Text = "Selection Count = " & _
Calendar1.SelectedDates.Count.ToString()
End Sub
Sub Selection_Change(sender As Object, e As EventArgs)
' Display the number of items selected.
Message.Text = "Selection Count = " & _
Calendar1.SelectedDates.Count.ToString()
End Sub
</script>
</head>
<body>
<form id="form1" runat="server">
<h3>SelectedDatesCollection Add Example </h3>
Click the button to select all Wednesdays in the month.
<br /><br />
<asp:Calendar ID="Calendar1" runat="server"
SelectionMode="DayWeekMonth"
OnSelectionChanged="Selection_Change" />
<hr />
<asp:Button id="SubmitButton"
Text="Select All Weds in Month"
OnClick="Button_Click"
runat="server" />
<br />
<asp:Label id="Message"
runat="server" />
</form>
</body>
</html>
Opmerkingen
Gebruik deze methode om alle System.DateTime objecten uit de SelectedDatesCollection verzameling te verwijderen en de Count eigenschap in te stellen op 0.