一.返回指定日期前后的某一日期;
// Sets a DateTime to April 3, 2002 of the Gregorian calendar.
DateTime myDT = new DateTime( 2002, 4, 3, new GregorianCalendar() );
// Uses the default calendar of the InvariantCulture.
Calendar myCal = CultureInfo.InvariantCulture.Calendar;
// Displays the values of the DateTime.
Console.WriteLine( "April 3, 2002 of the Gregorian calendar:" );
DisplayValues( myCal, myDT );
// Adds 5 to every component of the DateTime.
myDT = myCal.AddYears( myDT, 5 );
myDT = myCal.AddMonths( myDT, 5 );
myDT = myCal.AddWeeks( myDT, 5 );
myDT = myCal.AddDays( myDT, 5 );
myDT = myCal.AddHours( myDT, 5 );
myDT = myCal.AddMinutes( myDT, 5 );
myDT = myCal.AddSeconds( myDT, 5 );
myDT = myCal.AddMilliseconds( myDT, 5 );
// Sets a DateTime to April 3, 2002 of the Gregorian calendar.
DateTime myDT = new DateTime( 2002, 4, 3, new GregorianCalendar() );
// Uses the default calendar of the InvariantCulture.
Calendar myCal = CultureInfo.InvariantCulture.Calendar;
// Displays the values of the DateTime.
Console.WriteLine( "April 3, 2002 of the Gregorian calendar:" );
DisplayValues( myCal, myDT );
// Adds 5 to every component of the DateTime.
myDT = myCal.AddYears( myDT, 5 );
myDT = myCal.AddMonths( myDT, 5 );
myDT = myCal.AddWeeks( myDT, 5 );
myDT = myCal.AddDays( myDT, 5 );
myDT = myCal.AddHours( myDT, 5 );
myDT = myCal.AddMinutes( myDT, 5 );
myDT = myCal.AddSeconds( myDT, 5 );
myDT = myCal.AddMilliseconds( myDT, 5 );
二.在 Calendar Web 服务器控件中自定义个别日
默认情况下,Calendar 控件中的日只显示为数字。(如果启用日选定,则数字将显示为链接。有关详细信息,请参见在 Calendar Web 服务器控件中控制用户日期选定。)但是,您可以自定义单个日的内容和外观,如下所示:
当 Calendar 控件正在创建要发送到浏览器的输出时,它将引发一个您可以处理的 DayRender 事件。控件在准备要显示的日时将为每个日调用您的方法,然后您可采用编程的方式检查正显示的是哪个日期,并对其进行适当的自定义。
DayRender 事件的方法带有两个参数,包括引发事件的控件(Calendar 控件)的引用和一个 DayRenderEvent 类型的对象。DayRenderEvent 对象提供对另外两个对象的访问:
自定义个别日的外观
' Visual Basic Private Sub Calendar1_DayRender(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DayRenderEventArgs) Handles Calendar1.DayRender ' Additional code here End Sub // C# private void Calendar1_DayRender (object sender, System.Web.UI.WebControls.DayRenderEventArgs e) { // Additional code here }
' Visual Basic If (e.Day.IsToday) Then e.Cell.BackColor = System.Drawing.Color.Red End If // C# if (e.Day.IsToday) { e.Cell.BackColor = System.Drawing.Color.Red; }
下例显示一个简单但完整的方法,该方法阐释了如何更改个别日的外观。该方法使日历中的节假日呈现为黄色,而周末呈现为绿色。
' Visual Basic Public Sub Calendar1_DayRender(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DayRenderEventArgs) Handles Calendar1.DayRender ' Display vacation dates in yellow boxes with purple borders. Dim vacationStyle As New Style() With vacationStyle .BackColor = System.Drawing.Color.Yellow .BorderColor = System.Drawing.Color.Purple .BorderWidth = New Unit(3) End With ' Display weekend dates in green boxes. Dim weekendStyle As New Style() weekendStyle.BackColor = System.Drawing.Color.Green ' Vacation is from Nov 23, 2000 to Nov 30, 2000. If ((e.Day.Date >= New Date(2000, 11, 23)) _ And (e.Day.Date <= New Date(2000, 11, 30))) Then e.Cell.ApplyStyle(vacationStyle) ElseIf (e.Day.IsWeekend) Then e.Cell.ApplyStyle(weekendStyle) End If End Sub // C# private void Calendar1_DayRender (object sender, System.Web.UI.WebControls.DayRenderEventArgs e) { // Display vacation dates in yellow boxes with purple borders. Style vacationStyle = new Style(); vacationStyle.BackColor = System.Drawing.Color.Yellow; vacationStyle.BorderColor = System.Drawing.Color.Purple; vacationStyle.BorderWidth = 3; // Display weekend dates in green boxes. Style weekendStyle = new Style(); weekendStyle.BackColor = System.Drawing.Color.Green; if ((e.Day.Date >= new DateTime(2000,11,23)) && (e.Day.Date <= new DateTime(2000,11,30))) { // Apply the vacation style to the vacation dates. e.Cell.ApplyStyle(vacationStyle); } else if (e.Day.IsWeekend) { // Apply the weekend style to the weekend dates. e.Cell.ApplyStyle(weekendStyle); } }