DropDownList自动生成年月日
aspx页面上有三个dropdownlist控件，
dropdownlist1 表示年，dropdownlist2表示月，dropdownlist3表示天；
注意用将这三个dropdownlist控件的autopostback属性设为true。
用户能够方便地选择年月日，并且每月的日期会随着用户选择不同的年，月而发生相应的变化
代码直接复制过去即可使用
前台代码
<div>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
onselectedindexchanged="DropDownList1_SelectedIndexChanged">
</asp:DropDownList>
<asp:DropDownList ID="DropDownList2" runat="server" AutoPostBack="True"
onselectedindexchanged="DropDownList2_SelectedIndexChanged1">
</asp:DropDownList>
<asp:DropDownList ID="DropDownList3" runat="server">
</asp:DropDownList>
</div>
后台代码
protected void Page_Load(object sender, EventArgs e)
{
DateTime tnow = DateTime.Now;//现在时间
ArrayList alyear = new ArrayList();
int i;
for (i = 2002; i <= 2010; i++)
alyear.Add(i);
ArrayList almonth = new ArrayList();
for (i = 1; i <= 12; i++)
almonth.Add(i);
if (!this.IsPostBack)
{
DropDownList1.DataSource = alyear;
DropDownList1.DataBind();//绑定年
//选择当前年
DropDownList1.SelectedValue = tnow.Year.ToString();
DropDownList2.DataSource = almonth;
DropDownList2.DataBind();//绑定月
//选择当前月
DropDownList2.SelectedValue = tnow.Month.ToString();
int year, month;
year = Int32.Parse(DropDownList1.SelectedValue);
month = Int32.Parse(DropDownList2.SelectedValue);
binddays(year, month);//绑定天
//选择当前日期
DropDownList3.SelectedValue = tnow.Day.ToString();
}
}
//判断闰年
private bool checkleap(int year)
{
if ((year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0))
return true;
else return false;
}
//绑定每月的天数
private void binddays(int year, int month)
{
int i;
ArrayList alday = new ArrayList();
switch (month)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
for (i = 1; i <= 31; i++)
alday.Add(i);
break;
case 2:
if (checkleap(year))
{
for (i = 1; i <= 29; i++)
alday.Add(i);
}
else
{
for (i = 1; i <= 28; i++)
alday.Add(i);
}
break;
case 4:
case 6:
case 9:
case 11:
for (i = 1; i <= 30; i++)
alday.Add(i);
break;
}
DropDownList3.DataSource= alday;
DropDownList3.DataBind();
}
//选择年
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
int year, month;
year = Int32.Parse(DropDownList1.SelectedValue);
month = Int32.Parse(DropDownList2.SelectedValue);
binddays(year, month);
}
//选择月
protected void DropDownList2_SelectedIndexChanged1(object sender, EventArgs e)
{
int year, month;
year = Int32.Parse(DropDownList1.SelectedValue);
month = Int32.Parse(DropDownList2.SelectedValue);
binddays(year, month);
}
comboBox控件自动生成年月日
//判断闰年
private bool checkleap(int year)
{
if ((year % 4 == 0) && (year % 100 != 0) || (year % 400 == 0))
return true;
else return false;
}
//绑定每月的天数
private void binddays(int year, int month)
{
int i;
ArrayList alday = new ArrayList();
switch (month)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
for (i = 1; i <= 31; i++)
alday.Add(i);
break;
case 2:
if (checkleap(year))
{
for (i = 1; i <= 29; i++)
alday.Add(i);
}
else
{
for (i = 1; i <= 28; i++)
alday.Add(i);
}
break;
case 4:
case 6:
case 9:
case 11:
for (i = 1; i <= 30; i++)
alday.Add(i);
break;
}
this.comboBox3.DataSource = alday;
}
private void Form1_Load(object sender, EventArgs e)
{
//绑定年
ArrayList alyear = new ArrayList();
int i;
for (i = 1900; i <= 2099; i++)
alyear.Add(i);
this.comboBox1.DataSource = alyear;
//绑定月
ArrayList almonth = new ArrayList();
for (i = 1; i <= 12; i++)
almonth.Add(i);
this.comboBox2.DataSource = almonth;
int year, month;
year = Int32.Parse(this.comboBox1.SelectedValue.ToString());
month = Int32.Parse(this.comboBox2.SelectedValue.ToString());
binddays(year, month);//绑定天
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
int year, month;
year = Int32.Parse(this.comboBox1.SelectedValue.ToString());
month = 1;
binddays(year, month);
}
private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
{
int year, month;
year = Int32.Parse(this.comboBox1.SelectedValue.ToString());
month = Int32.Parse(this.comboBox2.SelectedValue.ToString());
binddays(year, month);
}