コレクションからすべての System.DateTime オブジェクトを削除します。
名前空間: System.Web.UI.WebControls
アセンブリ: System.Web (system.web.dll 内)
構文
'宣言
Public Sub Clear
'使用
Dim instance As SelectedDatesCollection
instance.Clear
public void Clear ()
public:
void Clear ()
public void Clear ()
public function Clear ()
適用できません。
解説
このメソッドを使用して、SelectedDatesCollection コレクションからすべてのSystem.DateTime オブジェクトを削除し、Count プロパティに 0 を設定します。
使用例
Clear メソッドを使用して、SelectedDatesCollection コレクションからすべての System.DateTime オブジェクトを削除し、新しい System.DateTime オブジェクトに置き換える方法を次のコード例に示します。
<%@ 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>
<%@ 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>
プラットフォーム
Windows 98,Windows Server 2000 SP4,Windows CE,Windows Millennium Edition,Windows Mobile for Pocket PC,Windows Mobile for Smartphone,Windows Server 2003,Windows XP Media Center Edition,Windows XP Professional x64 Edition,Windows XP SP2,Windows XP Starter Edition
Microsoft .NET Framework 3.0 は Windows Vista,Microsoft Windows XP SP2,および Windows Server 2003 SP1 でサポートされています。
バージョン情報
.NET Framework
サポート対象 : 3.0,2.0,1.1,1.0
参照
関連項目
SelectedDatesCollection クラス
SelectedDatesCollection メンバ
System.Web.UI.WebControls 名前空間
System.DateTime
Count