ASP.NET笔记之Calender的使用说明

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1、介绍

（1、在Calender中，所有可选择的符号会显示下划线，这是因为它们在浏览器都会呈现为链接。

如果让用户可以选择某天、月、周，必须设置SelectionMode属性（Day、 DayWeek、DayWeekMonth）

（2 控件事件当用户选择了某一天或者月，可以用OnSelectionChanged来触发

通过 Calendar1.SelectedDate.ToShortDateString();来获取所选择的时间点
通过 Calendar1.SelectedDate.Count.ToString();来获取所选择的天数

2、实例

现在通过一个实例来加深对日历控件的理解：

当点击TGIF时，会在日历上显示所选月份的所有星期五

当点击Apply时，会在日历上显示开始到结束的日期

Calender.aspx.cs

复制代码代码如下:

using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Web.UI;
 using System.Web.UI.WebControls;

 public partial class myTest_Calender : System.Web.UI.Page
 {
     protected void Page_Load(object sender, EventArgs e)
     {
         if (!IsPostBack) {
             my_Calendar.VisibleDate = my_Calendar.TodaysDate;
             //将选择的日期中的月份映射到下拉框中
             Month_List.SelectedIndex = my_Calendar.VisibleDate.Month - 1;
         }
         //显示到标签中
         lblTodaysDate.Text = "Today is  :" + my_Calendar.TodaysDate.ToShortDateString();
     }
     //选择一个日期的时候触发函数
     protected void Calendar_Select(object sender, EventArgs e)
     {
         lblCountUpdate();
         lblSelectedUpdate();
         txtClear();
     }
     //下拉框触发函数
     protected void Month_SelectedChange(object sender, EventArgs e)
     {
         my_Calendar.SelectedDates.Clear();
         lblSelectedUpdate();
         lblCountUpdate();
         //重新设置时间
         my_Calendar.VisibleDate = new DateTime(my_Calendar.VisibleDate.Year,
             Int32.Parse(Month_List.SelectedItem.Value), 1);
         txtClear();
     }

     //重构函数01-修改日期的次数
     private void lblCountUpdate() {
         lblCount.Text = "the Count of Selected:" + my_Calendar.SelectedDates.Count.ToString();       
     }
     //重构函数02-清楚数据
     private void txtClear() {
         txtEnd.Text = "";
         txtStart.Text = "";
     }
     //重构函数03-修改日期
     private void lblSelectedUpdate() {
         if (my_Calendar.SelectedDate != DateTime.MinValue)
             lblSelctedDate.Text = "the  selected day is :" +
                 my_Calendar.SelectedDate.ToShortDateString();
     }
     //按钮1：显示所选月份的所有星期五
     protected void btnTgif_Click(object sender, EventArgs e)
     {
         int currnetMonth = my_Calendar.VisibleDate.Month;
         int curretnYear = my_Calendar.VisibleDate.Year;
         //先清除原先日历位置
         my_Calendar.SelectedDates.Clear();
         //如果日期是星期五则将其添加到日历中
         for (int i = 1; i <= System.DateTime.DaysInMonth(
             curretnYear, currnetMonth); i++) {

                 DateTime datetime = new DateTime(curretnYear, currnetMonth, i);
                 if (datetime.DayOfWeek == DayOfWeek.Friday)
                     my_Calendar.SelectedDates.Add(datetime);
             }
         lblSelectedUpdate();
         lblCountUpdate();
     }
     //按钮2：
     protected void btnRange_Click(object sender, EventArgs e)
     {
         int currnetMonth = my_Calendar.VisibleDate.Month;
         int curretnYear = my_Calendar.VisibleDate.Year;

         DateTime StartDate = new DateTime(curretnYear, currnetMonth,Int32.Parse(txtStart.Text));
         DateTime EndtartDate = new DateTime(curretnYear, currnetMonth, Int32.Parse(txtEnd.Text));
         my_Calendar.SelectedDates.Clear();
         my_Calendar.SelectedDates.SelectRange(StartDate,EndtartDate);

         lblCountUpdate();
         lblSelectedUpdate();
     }
 }

Calender.aspx

复制代码代码如下:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Calender.aspx.cs" Inherits="myTest_Calender" %>

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

 <html xmlns="http://www.w3.org/1999/xhtml">
 <head runat="server">
     <title>Calender  Control</title>
 </head>
 <body>
     <form id="form1" runat="server">
     <div>
         <h1>Calender  Control</h1>
         <h2></h2>
         <asp:Calendar ID="my_Calendar" runat="server"
                     OnSelectionChanged="Calendar_Select">
         </asp:Calendar>
         <br  />
         <asp:Label ID="lblCount" runat="server" Text="Label"></asp:Label>
         <br />
         <asp:Label ID="lblTodaysDate" runat="server" Text="Label"></asp:Label>
         <br />
         <asp:Label ID="lblSelctedDate" runat="server" Text="Label"></asp:Label>

         <table>
            <tr>
                <td>Select a month</td>
                <td>
                    <asp:DropDownList ID="Month_List" runat="server"
                        AutoPostBack="true"
                        OnSelectedIndexChanged="Month_SelectedChange">
                        <asp:ListItem text="January" Value="1" />
                        <asp:ListItem text="February" Value="2" />
                        <asp:ListItem text="March" Value="3" />
                        <asp:ListItem text="April" Value="4" />
                        <asp:ListItem text="May" Value="5" />
                        <asp:ListItem text="June" Value="6" />
                        <asp:ListItem text="July" Value="7" />
                        <asp:ListItem text="Augut" Value="8" />
                        <asp:ListItem text="September" Value="9" />
                        <asp:ListItem text="October" Value="10" />
                        <asp:ListItem text="November" Value="11" />
                        <asp:ListItem text="December" Value="12" />
                    </asp:DropDownList>
                </td>
                <td>
                    <asp:Button ID="btnTgif" runat="server" 
                        Text="TGIF" 
                        OnClick="btnTgif_Click"/>
                </td>
            </tr>
            <tr>
                <td  colspan="2">&nbsp;</td>
            </tr>
            <tr>
                <td  colspan="2"><b>Day Range</b></td>
            </tr>

            <tr>
                <td >Starting  Day</td>
                <td >Ending  Day</td>
            </tr>

            <tr>
                <td >
                    <asp:TextBox ID="txtStart" runat="server"
                        Width="25" MaxLength="2"></asp:TextBox>
                </td>
                <td >
                    <asp:TextBox ID="txtEnd" runat="server"
                        Width="25" MaxLength="2"></asp:TextBox>
                </td>
                <td >
                    <asp:Button ID="btnRange" runat="server" Text="Apply" 
                      OnClick="btnRange_Click" style="height: 21px"/>
                </td>
            </tr>
         </table>
     </div>
     </form>
 </body>
 </html>