namespace _12日期选择器 { public partial class Form1 : Form { public Form1() { InitializeComponent(); }
private void Form1_Load(object sender, EventArgs e)
{
//获取当前时间
int year = DateTime.Now.Year;
//当程序运行时就将年份加载进去cboYears
for (int i = year; i >=1949; i--)
{
cboYears.Items.Add(i+"年");
}
}
private void cboYears_SelectedIndexChanged(object sender, EventArgs e)
{
//添加月份之前清空之前记录
cboMonths.Items.Clear();
//当选择年份时，加载月份
for (int i = 1; i <= 12; i++)
{
cboMonths.Items.Add(i+"月");
}
}
private void cboMonths_SelectedIndexChanged(object sender, EventArgs e)
{
//定义一个day来存储天数
int day = 0;
//加载day之前清空之前记录
cboDays.Items.Clear();
//获得月份
string strmonth = cboMonths.SelectedItem.ToString().Split(new char[] { '月' }, StringSplitOptions.RemoveEmptyEntries)[0];
//获得年份
string strYear = cboYears.SelectedItem.ToString().Split(new char[] { '年' }, StringSplitOptions.RemoveEmptyEntries)[0];
//将年月字符串类型转换成int类型
int year = Convert.ToInt32(strYear);
int month = Convert.ToInt32(strmonth);
//对month进行多条件判断
switch (month)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:day = 31;
break;
case 2:if(year%400==0 || year%4==0 && year % 100 != 0)
{
day = 29;
}
else
{
day = 28;
}
break;
default:day = 30;
break;
}
for (int i = 1; i <= day; i++)
{
cboDays.Items.Add(i+"日");
}
}
}
}
