ASP.NET工程中日历控件的典型应用之一

很多朋友问我，如何动态选择日期呢，如何选择完日期以后，关闭本页同时把日期传入上一页呢？这个问题也曾经困扰我许久，在ASP中我知道如何做，可是在ASP.NET中却有点迷惑。

为此，我查阅了很多的资料，终于研究通了，现在分享给大家。

源代码如下：calendar.aspx.cs

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
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 WebApplication_rd
{
/// <summary>
/// Summary description for WebForm1.
/// </summary>
public class calendar : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Label Label1;
protected System.Web.UI.WebControls.DataGrid DataGrid1;

private void Page_Load(object sender, System.EventArgs e)
{
if (! Page.IsPostBack)
BindData();
}

private void BindData()
{
SqlConnection con = new SqlConnection("server=localhost;database=Northwind;uid=sa;pwd=;");
SqlCommand cmd = new SqlCommand("SELECT TOP 10 * FROM Orders", con);

try
{
con.Open();
DataGrid1.DataSource = cmd.ExecuteReader();
DataGrid1.DataBind();
con.Close();
}
catch (Exception ex)
{
Trace.Warn(ex.Message);
}
}

#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.DataGrid1.CancelCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_CancelItemCommand);
this.DataGrid1.EditCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_EditItemCommand);
this.DataGrid1.UpdateCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_UpdateItemCommand);
this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_OnItemDataBound);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

private void DataGrid1_EditItemCommand(object sender, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
DataGrid1.EditItemIndex = e.Item.ItemIndex;
BindData();
}

private void DataGrid1_CancelItemCommand(object sender, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
DataGrid1.EditItemIndex = -1;
BindData();
}

private void DataGrid1_UpdateItemCommand(object sender, System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
Int32 iLastCellIndex = e.Item.Cells.Count-1; //The Index for the last cell
String sNewDate = ((TextBox)e.Item.Cells[iLastCellIndex].FindControl("txtDate")).Text; //Get the value of the TextBox
Label1.Text = "You set the date " + sNewDate;
//Add database updating here
DataGrid1.EditItemIndex = -1;
BindData();
}

private void DataGrid1_OnItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
if ( e.Item.ItemType == ListItemType.EditItem )
{
Int32 iLastCellIndex = e.Item.Cells.Count-1; //The Index for the last cell
String sTextBoxName = e.Item.Cells[iLastCellIndex].FindControl("txtDate").ClientID; //The rendered name of the TextBox
String sLink = "<a href=/"javascript:pickDate('" +
sTextBoxName +
"');/"><IMG SRC=/"i/iCalendar.gif/" border=/"0/" align=/"absmiddle/"></a>"; //The HTML to add to the Edit cell
e.Item.Cells[iLastCellIndex].Controls.Add(new LiteralControl(sLink)); //Add the HTML
}
}

}
}

CalendarPopUp.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 WebApplication_rd
{
/// <summary>
/// Summary description for CalendarPopUp.
/// </summary>
public class CalendarPopUp : System.Web.UI.Page
{
protected System.Web.UI.WebControls.LinkButton LinkButton1;
protected System.Web.UI.WebControls.Calendar Calendar1;

private void Page_Load(object sender, System.EventArgs e)
{
// Put user code to initialize the page here
}

#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.LinkButton1.Click += new System.EventHandler(this.LinkButton1_Click);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

private void LinkButton1_Click(object sender, System.EventArgs e)
{
System.Text.StringBuilder sbScript = new System.Text.StringBuilder();
sbScript.Append("<script language='javascript'>"); //Opening script tag
sbScript.Append(Environment.NewLine); //Newline
sbScript.Append("window.opener.document.all['"); //Reference to original window
sbScript.Append(Request.QueryString["src"]); //Control to set value on
sbScript.Append("'].value = '"); //Set the value
sbScript.Append(Calendar1.SelectedDate.ToShortDateString()); //The date
sbScript.Append("';"); //End of line
sbScript.Append(Environment.NewLine); //Newline
sbScript.Append("window.close();"); //Close this window
sbScript.Append(Environment.NewLine); //Newline
sbScript.Append("</script>"); //Closing script tag

//Add the script to the page
this.Page.Controls.Add(new LiteralControl(sbScript.ToString()));
}
}
}