webform的三级联动
2024-09-19 23:53:56
webform的三级联动
与winform一样，只不过需把DropDownList的AutoPostBack属性改为True。
*简单日期的编写方法：
用是三个DropDownList分别代表年月日，用for循环进行数据绑定，同时并对日进行判断
for (int i = DateTime.Now.Year; i >= 1900; i--)
{
ListItem li = new ListItem(i.ToString());
Year_Dr.Items.Add(li);
} for (int i = 1; i <= 12; i++)
{
ListItem li = new ListItem(i.ToString());
Mouth_dr.Items.Add(li);
} Days();
Mouth_dr.SelectedValue = DateTime.Now.Month.ToString();
Day_dr.SelectedValue = DateTime.Now.Day.ToString();
} Year_Dr.SelectedIndexChanged +=Year_Dr_SelectedIndexChanged;
Mouth_dr.SelectedIndexChanged +=Mouth_dr_SelectedIndexChanged;
//方法及事件 private void Days()
{
for (int i = 1; i <= 31; i++)
{
int year = Convert.ToInt32(Year_Dr.SelectedValue);
int mouth = Convert.ToInt32(Mouth_dr.SelectedValue);
if (mouth == 1 || mouth == 3 || mouth == 5 || mouth == 7 || mouth == 8 || mouth == 10 || mouth == 12)
{
}
else if (mouth == 4 || mouth == 6 || mouth == 9 || mouth == 11)
{
if (i == 31)
{
break;
}
}
else if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))
{
if (i == 30)
{
break;
}
}
else
{
if (i == 29)
{
break;
}
}
ListItem li = new ListItem(i.ToString());
Day_dr.Items.Add(li);
}
} void Mouth_dr_SelectedIndexChanged(object sender, EventArgs e)
{
Day_dr.Items.Clear();
Days(); } void Year_Dr_SelectedIndexChanged(object sender, EventArgs e)
{
Mouth_dr.Items.Clear();
Day_dr.Items.Clear();
for (int i = 1; i <= 12; i++)
{
ListItem li = new ListItem(i.ToString());
Mouth_dr.Items.Add(li);
} Days();
}
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