ASP.NET笔记之Calender的使用说明

前端技术 2023/09/01 .NET

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\"> </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>

总结: 

(1  采用一些重构,将一些函数方法分离出去,这一块有一些还没分离完全

(2  日期控件还有VisiblMonthChanged事件来处理日历是否被用户更改了月份,   e.NewDate.Year 和e.PreviousDate.Year诸如此类的比较

(3 DayRender事件,可以通过cell和Day来呈现日期的特殊性,例如周末和节假日的颜色,  

             e.Day.IsOtherMOnth    e.Day.IsWeekend  等

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