三个DropDownList分别代表年月日，再给日期设定的时候，要先判断平年还是闰年，然后再根据月份设定时间，请问下我应该怎么写？？？
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
到达时间：<asp:DropDownList ID="ddl_GoYear" runat="server" AutoPostBack="True">
</asp:DropDownList>
<asp:DropDownList ID="ddl_GoMonth" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddl_GoMonth_SelectedIndexChanged">
</asp:DropDownList>
<asp:DropDownList ID="ddl_GoDay" runat="server">
</asp:DropDownList>
<br />
离开时间：<asp:DropDownList ID="ddl_LeaveYear" runat="server" AutoPostBack="True">
</asp:DropDownList>
<asp:DropDownList ID="ddl_LeaveMonth" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ddl_LeaveMonth_SelectedIndexChanged">
</asp:DropDownList>
<asp:DropDownList ID="ddl_LeaveDay" runat="server">
</asp:DropDownList>
<br />
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</div>
</form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//添加年份
for (int i = 2004; i <= 2014; i++)
{
ddl_GoYear.Items.Add(i.ToString());
ddl_LeaveYear.Items.Add(i.ToString());
}
//添加月份
for (int i = 1; i <= 12; i++)
{
ddl_GoMonth.Items.Add(i.ToString());
ddl_LeaveMonth.Items.Add(i.ToString());
}
}
}
protected void ddl_GoMonth_SelectedIndexChanged(object sender, EventArgs e)
{
//到达时间
//判断平年闰年
if (Convert.ToInt32(ddl_GoMonth.SelectedItem.Text) == 2) //获得当前月份
{
if (DateTime.IsLeapYear(Convert.ToInt32(ddl_GoYear.SelectedItem.Text)) == true) //TRUE为闰年，FALSE为平年
{
for (int i = 1; i <= 29; i++)
{
ddl_GoDay.Items.Add(i.ToString());
}
}
else if (DateTime.IsLeapYear(Convert.ToInt32(ddl_GoYear.SelectedItem.Text)) == false)
{
for (int i = 1; i <= 28; i++)
{
ddl_GoDay.Items.Add(i.ToString());
}
}
}
//添加日期（31天）
if (Convert.ToInt16(ddl_GoMonth.SelectedItem.Text) == 1 || Convert.ToInt16(ddl_GoMonth.SelectedItem.Text) == 3 || Convert.ToInt16(ddl_GoMonth.SelectedItem.Text) == 5 || Convert.ToInt16(ddl_GoMonth.SelectedItem.Text) == 7 || Convert.ToInt16(ddl_GoMonth.SelectedItem.Text) == 8 || Convert.ToInt16(ddl_GoMonth.SelectedItem.Text) == 10 || Convert.ToInt16(ddl_GoMonth.SelectedItem.Text) == 12)
{
for (int i = 1; i <= 31; i++)
{
ddl_GoDay.Items.Add(i.ToString());
}
} //添加日期（30天）
if (Convert.ToInt16(ddl_GoMonth.SelectedItem.Text) == 4 || Convert.ToInt16(ddl_GoMonth.SelectedItem.Text) == 6 || Convert.ToInt16(ddl_GoMonth.SelectedItem.Text) == 9 || Convert.ToInt16(ddl_GoMonth.SelectedItem.Text) == 11)
{
for (int i = 1; i <= 30; i++)
{
ddl_GoDay.Items.Add(i.ToString());
}
}
}
protected void ddl_LeaveMonth_SelectedIndexChanged(object sender, EventArgs e)
{
//离开时间
//添加日期（31天）
if (Convert.ToInt16(ddl_LeaveMonth.SelectedItem.Text) == 1 || Convert.ToInt16(ddl_LeaveMonth.SelectedItem.Text) == 3 || Convert.ToInt16(ddl_LeaveMonth.SelectedItem.Text) == 5 || Convert.ToInt16(ddl_LeaveMonth.SelectedItem.Text) == 7 || Convert.ToInt16(ddl_LeaveMonth.SelectedItem.Text) == 8 || Convert.ToInt16(ddl_LeaveMonth.SelectedItem.Text) == 10 || Convert.ToInt16(ddl_LeaveMonth.SelectedItem.Text) == 12)
{
for (int i = 1; i <= 31; i++)
{
ddl_LeaveDay.Items.Add(i.ToString());
}
} //添加日期（30天）
if (Convert.ToInt16(ddl_LeaveMonth.SelectedItem.Text) == 4 || Convert.ToInt16(ddl_LeaveMonth.SelectedItem.Text) == 6 || Convert.ToInt16(ddl_LeaveMonth.SelectedItem.Text) == 9 || Convert.ToInt16(ddl_LeaveMonth.SelectedItem.Text) == 11)
{
for (int i = 1; i <= 30; i++)
{
ddl_LeaveDay.Items.Add(i.ToString());
}
}
}
}
我这样写为什么二月份总是29天？
请各位大神指教。
小弟头次发帖，有什么不合适的地方各位多多指正。。。
