public partial class MessageControl : System.Web.UI.UserControl in VS .NET

Painting QR Code 2d barcode in VS .NET public partial class MessageControl : System.Web.UI.UserControl

public partial class MessageControl : System.Web.UI.UserControl
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{ public event SendMessageHandler SendMessage; protected void btnMessage_Click(object sender, EventArgs e) { if (SendMessage != null) SendMessage(txtName.Text); } }
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The event must always be declared as public at the top of the user control class. The btnMessage control s Click event handler has been programmed to raise the event, passing the contents of txtName.Text. The user control can be added to a Web page, and code can be added to subscribe to the SendMessage event, as shown in the follow ing code sample:
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'VB <%@ Page Language="VB" AutoEventWireup="false" CodeFile="MessageControlTest.aspx.vb" Inherits="MessageControlTest" %> <%@ Register Src="MessageControl.ascx" TagName="MessageControl" TagPrefix="uc1" %> <!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>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <div>
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<uc1:MessageControl ID="MessageControl1" runat="server" />
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<asp:Label ID="lblResult" runat="server" Text=""></asp:Label>
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Creating Custom Web Controls
</div> </form>
</body>
</html>
//C# <%@ Page Language="C#" AutoEventWireup="true" CodeFile="MessageControlTest.aspx.cs" Inherits="MessageControlTest" %> <%@ Register Src="MessageControl.ascx"
TagName="MessageControl" TagPrefix="uc1" %>
<!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>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server"> <div> <uc1:MessageControl ID="MessageControl1" runat="server" /> <br /> <br /> <asp:Label ID="lblResult" runat="server" Text=""></asp:Label> </div> </form>
</body>
</html>
Code-Behind
'VB Partial Class MessageControlTest
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Me.Load AddHandler MessageControl1.SendMessage, addressof MessageReceived End Sub private Sub MessageReceived(message as String)
lblResult.Text = message
End Sub
End Class
//C# using using using using using
System;
System.Data;
System.Configuration;
System.Collections;
System.Web;
Lesson 1: Working with User Controls
using using using using using
System.Web.Security; System.Web.UI; System.Web.UI.WebControls; System.Web.UI.WebControls.WebParts; System.Web.UI.HtmlControls;
public partial class MessageControlTest : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { MessageControl1.SendMessage +=
delegate(string message){ lblResult.Text = message; }
Figure 5-3 shows the completed Web page after a name was entered into the TextBox and the Button was clicked.
Figure 5-3
The user control raises the SendMessage event that can be handled by the Web page.
It s interesting to note the differences in implementation based on the programming language. In VB, the event was easy to create because the creation of an event causes the VB compiler to automatically create a delegate to handle the event, whereas C# requires you to create the delegate. When it s time to implement the user control and its SendMessage event, VB requires you to create an event handler method to populate the Label control with the message, whereas C# lets you implement an anonymous method to handle the event.
5
Creating Custom Web Controls
Creating a Templated User Control
A templated user control provides separation of control data from its presentation, meaning that a templated user control does not provide a default user interface. For example, if you know that you need to display your shipper s information, such as the shipper ID, the shipper name, and the shipper phone number, but you don t know how the page designer wants to format this information, you could create a templated user control called ShipperControl that allows the page designer to supply the format for the shipper data using a template. Like user controls, the templated user control is only reusable in the same Web site. If you want reusability across multiple sites, consider implementing the templated control that s described near the end of this chapter. The templated user control must provide a container class that is a naming container and has properties that are accessible to the host page. The template contains the user interface for the templated user control and is supplied by the page developer at design time. A template can contain controls and markup. You can create a templated user control by following these steps: 1. Add a user control file to your Web application. 2. In the .ascx file, place an ASP.NET Placeholder control where you want the tem plate to appear. 3. In the code-behind file, implement a property of type ITemplate. 4. Add a new class to the App_Code folder in your Web site that contains the tem plate s naming container class. This class inherits from Control, implements the INamingContainer, and contains a public property for each data element that is visible to the template. The container control contains an instance of the tem plate when it is rendered. 5. Apply the TemplateContainerAttribute to the ITemplate property and pass the type of the template s naming container class as the argument to the constructor of the attribute. 6. Also, apply the PersistenceModeAttribute to the ITemplate property and pass the enumeration value of PersistenceMode.InnerProperty into its constructor. 7. In the user control s code-behind page, add public properties that let you pass your data to the template s naming container class so the data is available in the template.
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