User control with property : Basics « Custom Controls « ASP.NET Tutorial






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  2. Custom Controls
  3. Basics
<%@ Page Language="C#" %>
<%@ Register TagPrefix="apress" TagName="TimeDisplay" Src="Control.ascx" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<script runat="server">

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <apress:TimeDisplay id="TimeDisplay1" 
  Format="dddd, dd MMMM yyyy HH:mm:ss tt (GMT z)" runat="server" />
<hr />
<apress:TimeDisplay id="TimeDisplay2" runat="server" />

    </div>
    </form>
</body>
</html>

File: Control.ascx

<%@ Control Language="C#" 
            AutoEventWireup="true" 
            CodeFile="Control.ascx.cs" 
            Inherits="TimeDisplay" %>
<br />
<asp:LinkButton runat="server" ID="lnkTime" OnClick="lnkTime_Click"/>

File: Control.ascx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class TimeDisplay : System.Web.UI.UserControl
{
  protected void Page_Load(object sender, EventArgs e)
  {
    RefreshTime();
  }

  protected void lnkTime_Click(object sender, EventArgs e)
  {
    RefreshTime();
  }

  public void RefreshTime()
  {
    if (format == "")
    {
      lnkTime.Text = DateTime.Now.ToLongTimeString();
    }
    else
    {
      lnkTime.Text = DateTime.Now.ToString(format);
    }

  }

  private string format;
  public string Format
  {
    get { return format; }
    set { format = value; }
  }
}








14.2.Basics
14.2.1.User control with property
14.2.2.ASP controls in user control
14.2.3.A Web user control file template
14.2.4.Adding controls to the Web user control
14.2.5.Creating control events in a user control (C#)
14.2.6.Creating control events in a user control (VB)
14.2.7.Exposing user control properties (C#)
14.2.8.Exposing user control properties (VB)
14.2.9.Populating user control properties from the host Web page (C#)
14.2.10.Populating user control properties from the host Web page (VB)
14.2.11.Component level variable
14.2.12.Action from user-defined control
14.2.13.Pass parameter from user-defined controls to host page
14.2.14.Calculator component based on page component (VB.net)
14.2.15.Day minder page component
14.2.16.Use custom control in Assembly
14.2.17.Building a simple User control that randomly displays one image
14.2.18.Registering User Controls in the Web Configuration File
14.2.19.Building Fully Rendered Controls