Creating Custom Web Controls in Visual C#.NET

Encoder QR in Visual C#.NET Creating Custom Web Controls

ChAPTER 7
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Creating Custom Web Controls
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Adding a User Control to a Page
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You can add a user control to a webpage by simply dragging it from Solution Explorer to a webpage in Design view. When you add the user control to a page, you can see the control s visual makeup in Design view. If you switch to Source view, you can see the markup information that Visual Studio added to your page. The following shows sample markup of the Address user control when it is added to a webpage.
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<%@ Page Language="VB" AutoEventWireup="false" CodeFile="UserProfileUpdate.aspx.vb" Inherits="UserProfileUpdate" %> <%@ Register src="AddressUserControl.ascx" tagname="AddressUserControl" 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></title> </head> <body> <form id="form1" runat="server"> <div> <uc1:AddressUserControl ID="AddressUserControl1" runat="server" AddressType="Home" /> </div> </form> </body> </html>
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Notice the @ Register directive at the top of the page. You must include this directive to register the user control on the page. The TagPrefix attribute is a namespace identifier for the control. Your markup uses this prefix to define the control. The default TagPrefix is uc1 (as in User Control 1). Of course, you can change this value. The TagName attribute is the name of the control. The Src attribute is the location of the user control file. The actual instance definition for the control is nested within the <form> tag. Notice that the ID is automatically created as AddressUserControl1. Also, notice that the AddressType custom property is defined as an attribute of the control. The other property, UserId, is meant to indicate a unique ID of the user whose address values are being modified. Therefore, this property would most likely be set in code (from a query string value, session state, a cookie, or something similar).
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Dynamically Loading User Controls
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Like other server controls, user controls can be loaded dynamically. Loading controls dynamically can be useful in situations in which you want to add a variable number of instances of a control to a page.
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Lesson 1: Creating User Controls
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ChAPTER 7
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To dynamically load a user control, you use the LoadControl method of the Page class. This method takes the name and path to a file that contains the user control s definition. The method also returns a reference to the control class it creates. You can set this to a variable by casting the returned object to a strong type. For this to work, the control must already be registered with the page. For example, suppose that you need to add multiple instances of the Address user control discussed previously to a new page at run time, and that the number of instances you need to add is based on the number of stored addresses for the user. The following code shows an example of how you would dynamically load the control.
Sample of Visual Basic Code Dim addressControl As AddressUc = _ CType(LoadControl("AddressUserControl.ascx"), AddressUc) form1.Controls.Add(addressControl) Sample of C# Code AddressUc addressControl = (AddressUc)LoadControl("AddressUserControl.ascx"); form1.Controls.Add(addressControl);
Notice the second line of code. After the control has been loaded, it needs to be added to the Form object for display and use.
Creating a Templated User Control
A templated user control provides separation of control data from the presentation of that data. A templated user control does not provide a default UI layout. Instead, this layout is provided by the developer who uses the user control on his or her page. This provides increased flexibility in terms of layout while keeping the encapsulation and reuse benefits of a user control. There are several steps for creating a templated user control:
1. 2.
Start by adding a user control file to your web application. Add an ASP.NET PlaceHolder control to the user control s markup. This defines a placeholder for the templated layout. You will expose this placeholder as a property of your user control. Developers who use your control will then define their markup layout code inside this template. Create a class file in your site to serve as a naming container for your control. A naming container is simply a control container that allows you to search for a contained child control by using FindControl, which you ve used with both Page and MasterPage in previous chapters. This is important to know because in addition to containing controls, your templated, UserControl-based class file will need to contain a reference to the data with which your user control works. This data will be bound to the child controls when a developer creates his or her own layout template based on your control.
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