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让Calendar在页面调用时才显示

   最近常有朋友问起这样一个问题:在ASP.NET里如何做到当需要调用Calendar时,就让它显示,选择完时间后让它自动隐藏,并返回一个日期字符串到文本输入框内。
  曾经我看到网上流行的一个用VB.NET写的UserControl实现了这部分功能,在这里我把它改成C#的版本,供需要的朋友下载学习。
  总的来说这个功能分两步,第一步建立一个UserControl控件:
它的代码如下(popUpCalendar.ascx):
<%@ Control Language="c#" AutoEventWireup="false" Codebehind="popUpCalendar.ascx.cs" Inherits="CalendarExample.popUpCalendar" TargetSchema="http://schemas.microsoft.com/intellisense/ie5" %>
<asp:panel runat="server">
<asp:Calendar runat="server" BackColor="White" BorderColor="Black" BorderStyle="Solid" NextMonthText="<IMG src="http://www.host01.com/Get/Net/000200011/monthright.gif">" PrevMonthText="<IMG src="http://www.host01.com/Get/Net/000200011/monthleft.gif">">
  <TodayDayStyle BackColor="#FFFFC0"></TodayDayStyle>
  <DayStyle Font-Size="8pt" Font-Names="Arial"></DayStyle>
  <DayHeaderStyle Font-Size="10pt" Font-Underline="True" Font-Names="Arial" BorderStyle="None" BackColor="#E0E0E0"></DayHeaderStyle>
  <SelectedDayStyle Font-Size="8pt" Font-Names="Arial" Font-Bold="True" ForeColor="White" BackColor="Navy"></SelectedDayStyle>
  <TitleStyle Font-Size="10pt" Font-Names="Arial" Font-Bold="True" ForeColor="White" BackColor="Navy"></TitleStyle>
  <OtherMonthDayStyle ForeColor="Gray"></OtherMonthDayStyle>
</asp:Calendar>
</asp:panel>
对就的codebehind文件如下(popUpCalendar.ascx.cs):
namespace CalendarExample
{
using System;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;



/// <summary>
///  popUpCalendar 的摘要说明。
/// </summary>
public abstract class popUpCalendar : System.Web.UI.UserControl
{
  protected System.Web.UI.WebControls.Calendar Calendar1;
  protected System.Web.UI.WebControls.Panel pnlCalendar;



  private void Page_Load(object sender, System.EventArgs e)
  {
   // 在此处放置用户代码以初始化页面
  }



  #region Web Form Designer generated code
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN:该调用是 ASP.NET Web 窗体设计器所必需的。
   //
   InitializeComponent();
   base.OnInit(e);
  }
  
  ///  设计器支持所需的方法 - 不要使用
  ///  代码编辑器修改此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
   this.Calendar1.SelectionChanged += new System.EventHandler(this.Calendar1_SelectionChanged);
   this.Load += new System.EventHandler(this.Page_Load);
  }
  #endregion
  public void displayCalendar( string sCalToolText, DateTime dSelectedDate, string sDateFieldName , int iTop , int iLeft )
  {
   if (pnlCalendar.Visible == false)
            {
                pnlCalendar.Style["top"] = iTop.ToString ();
    pnlCalendar.Style["left"] = iLeft.ToString ();
    Calendar1.SelectedDate = dSelectedDate;
    Calendar1.VisibleDate = dSelectedDate;
    Calendar1.ToolTip = sCalToolText;
    Calendar1.Attributes["SelectedField"] = sDateFieldName;
    pnlCalendar.Visible = true;
   }
   else
    hideCalendar();
      }



  public void hideCalendar()
  {
   pnlCalendar.Visible = false;
  }



  private void Calendar1_SelectionChanged(object sender, System.EventArgs e)
  {
   TextBox txtDate;
   txtDate = (TextBox)Page.FindControl(Calendar1.Attributes["SelectedField"]);
            txtDate.Text = Calendar1.SelectedDate.ToShortDateString();
   hideCalendar();
  }
}
}



  第二步,在asp.net文件里调用这个UserControl;
它的代码如下(dispCalendar.aspx):
<%@ Register TagPrefix="sk" TagName="popUpCalendar" src="popUpCalendar.ascx"%>
<%@ Page language="c#" Codebehind="dispCalendar.aspx.cs" AutoEventWireup="false" Inherits="CalendarExample.WebForm1" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
  <title>WebForm1</title>
  <meta content="Microsoft Visual Studio 7.0">
  <meta content="C#">
  <meta content="Javascript">
  <meta content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
  <form method="post" runat="server">
   <sk:popupcalendar runat="server"></sk:popupcalendar>
   <table>
    <tr>
     <td>
      Select Date:
     </td>
     <td>
      <asp:TextBox runat="server"></asp:TextBox>
     </td>
     <td>
      <asp:ImageButton runat="server" ImageUrl="calendar.gif"></asp:ImageButton>
     </td>
    </tr>
   </table>
  </form>
</body>
</HTML>
对应的codebehind文件如下(dispCalendar.aspx.cs):
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;



namespace CalendarExample
{
/// <summary>
/// WebForm1 的摘要说明。
/// </summary>
public class WebForm1 : System.Web.UI.Page
{
  protected System.Web.UI.WebControls.TextBox txtStartDate;
  protected System.Web.UI.WebControls.ImageButton Button1;
  protected popUpCalendar myCalendar;

  private void Page_Load(object sender, System.EventArgs e)
  {
   if (!IsPostBack)
    myCalendar.hideCalendar();// 在此处放置用户代码以初始化页面
  }



  #region Web Form Designer generated code
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN:该调用是 ASP.NET Web 窗体设计器所必需的。
   //
   InitializeComponent();
   base.OnInit(e);
  }
  
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {    
   this.Button1.Click += new System.Web.UI.ImageClickEventHandler(this.Button1_Click);
   this.Load += new System.EventHandler(this.Page_Load);



  }
  #endregion
  
  private void Button1_Click(object sender, System.Web.UI.ImageClickEventArgs e)
  {
   DateTime dSelDate;
   try
   {
    dSelDate=DateTime.Parse(txtStartDate.Text);
   }
   catch
   {
    dSelDate=DateTime.Now;
   }
   myCalendar.displayCalendar("Select a start date", dSelDate,"txtStartDate", 22, 215);
  }
}
}