namespace _12日期選擇器
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
//獲取當前時間
int year = DateTime.Now.Year;
//當程序運行時就將年份加載進去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記錄
cboMonths.Items.Clear();
//當選擇年份時,加載月份
for (int i = 1; i <= 12; i++)
{
cboMonths.Items.Add(i+"月");
}
}
private void cboMonths_SelectedIndexChanged(object sender, EventArgs e)
{
//定義一個day來存儲天數
int day = 0;
//加載day之前清空之前記錄
cboDays.Items.Clear();
//獲得月份
string strmonth = cboMonths.SelectedItem.ToString().Split(new char[] { '月' }, StringSplitOptions.RemoveEmptyEntries)[0];
//獲得年份
string strYear = cboYears.SelectedItem.ToString().Split(new char[] { '年' }, StringSplitOptions.RemoveEmptyEntries)[0];
//將年月字符串類型轉換成int類型
int year = Convert.ToInt32(strYear);
int month = Convert.ToInt32(strmonth);
//對month進行多條件判斷
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");
}
}
}
}