Question

用C#设计一个日期类，该类中有私有成员year,month,day

(1);为month成员编写属性，要求输入值在1~12之间，
（2）；编写构造函数，对私有成员初始化
（3）；重载tostring()函数，输出格式"year-month-day"

Answer 1

internal class mydatetime
{
private int year;
private int month;
private int day;
public int Month
{
get { return month; }
set
{
if ((value > 0) && (value < 13))
{
month = value;
}
}
}
public mydatetime(int _year, int _month, int _day)
{
this.year = _year;
this.month = _month;
this.day = _day;
}
public override string ToString()
{
return string.Format("{0}-{1}-{2}", year, month, day);
}
}