[Exercise] Enter your birthday (year/month/day) #2

Original article exit http://www.dotblogs.com.tw/mis2000lab/archive/2013/06/10/calendar_visibledate_birthday_dropdownlist.aspx

[Exercise] Enter your birthday (year/month/day) #2 -- the time of the Calendar control jumps back to five years or ten years ago? -- TodaysDate and VisibleDate

 

Previous Article:[Exercise]Enter your birthday (Year/Month/Day)--Calendar(Calendar)Control time jump, one jump back five years, ten years ago?-- TodaysDateProperties,VisibleDateAttribute

Http://www.dotblogs.com.tw/mis2000lab/archive/2011/05/30/calendar_todaysdate.aspx

 

This exercise can be considered「 Previous set 」Ch.3Calendar Control.

Add the following features:

 

"Born"YearIf you want to include the one hundred-year option

We can't add sub-options by ourselves. It must be completed by writing programs.

 

How do I control the year?

SeeSystem. DateTimeThere are many available methods.

For example. AddYear ()Method, You can use-1 to subtract one year. Please referHttp://msdn.microsoft.com/zh-tw/library/system.datetime.addyears.aspx

 

For (int I = 0; I <101; I ++)

{

// = Method 1 =:

// Int myYear =System. DateTime. Now. Year -I;

// DropDownList1.Items. Add (myYear. ToString ());

 

// = Method 2 =:

DropDownList1.Items. Add (System. DateTime. Today. AddYears(-I). ToString ("Yyyy"));

}

 Suggestion: Set System. DateTimeMoveForLoop outside,

Avoid calling the Now () or. AddYear () method for each running cycle to save resources.

 

 

 

Another key point is to "Create a calendar control ".RenderingThat year, that month 」

Use the calendar control's「VisibleDate"AttributeIt is better than the "TodaysDate" attribute.

As mentioned in MSDN:

IfVisibleDateAttributeNot set. The specified date TodaysDate attribute determines which month will be displayed in the Calendar control.

 

// = Method 1 =:

// Calendar1. TodaysDate=New DateTime(Convert. ToInt32 (DropDownList1.SelectedValue), Convert. ToInt32 (DropDownList2.SelectedValue), 1 );

// = Date in DateTime (Year/Month/Day). Only integers are allowed 」.

 

// = Method 2 =:

// *** It is recommended that you use the. VisibleDate attribute instead.

// *** Only the current month is displayedMonth」!

Calendar1. VisibleDate=NewDateTime(Convert. ToInt32 (DropDownList1.SelectedValue), Convert. ToInt32 (DropDownList2.SelectedValue), 1 );

// = Date in DateTime (Year/Month/Day). Only integers are allowed 」.

 

When the. VisibleDate attribute is used, when the month date is not "preset", the screen looks better.

 

 

 

This is a supplementary example of class,

Many "beginners 」ThoughtDo not write programs by yourself

Later, I found that they do not use string functions or date-and time-related functions.

 

It may not be the "Basic if/for/while Syntax" That won't be used. After all, I have learned a little bit in school before.