c# thoughtworks qrcode Creating Custom Web Controls in Visual C#.NET

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Creating Custom Web Controls
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The naming container-based class you ll create inherits from Control and implements the INamingContainer interface, just as is done with UserControl itself. The class should also contain public properties for any data elements it is meant to contain.
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In your user control s code-behind file, implement a property of type ITemplate. This property will serve as the template for users of your control (and exposes the placeholder created in step 2). The name you give this property will be the name of the template tag in any consuming page s markup. Apply the TemplateContainerAttribute attribute to the ITemplate property; this marks the property as a template. To this attribute, pass the type of the naming container class for binding data (created in step 3) as an argument of the constructor. This serves to allow binding between the container and the template definition markup when the user control is added to a page. In this step you also apply the PersistenceModeAttribute attribute to the ITemplate property. You pass the enumeration value of PersistenceMode.InnerProperty into the attribute s constructor.
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Add code to the Page_Init method of the user control. Here you test for the ITemplate property. If the ITemplate property is set, you create an instance of the naming container class and create an instance of the template in the naming container. You then add the naming container instance to the Controls collection of the PlaceHolder server control. You might also need to pass data from your user control to the naming container. This allows users to set properties of your user control, and store and use them in the container. For these situations, you must define this data in your user control as properties that a developer who is using your user control can set. You then must pass a reference to this data to the naming container. This ensures that the naming container is updated when the property values change on the user control.
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As an example, suppose you want to implement the Address control discussed previously as a templated user control so that developers can define their own layout when using your control. To get started, you create a web User Control and add a PlaceHolder control to its markup, as shown in the following.
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The Address User Control Markup Sample of Visual Basic Code <%@ Control Language="VB" AutoEventWireup="false" CodeFile="AddressUcTemplated.ascx.vb" Inherits="AddressUcTemplated" %> <asp:PlaceHolder runat="server" ID="PlaceHolderAddressTemplate"> </asp:PlaceHolder> Sample of C# Code <%@ Control Language="C#" AutoEventWireup="true" CodeFile="AddressUcTemplated.ascx.cs" Inherits="AddressUcTemplated" %> <asp:PlaceHolder runat="server" ID="PlaceHolderAddressTemplate"> </asp:PlaceHolder>
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Lesson 1: Creating User Controls
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You then add code to the code-behind file for the user control. This includes the ITemplate property and the Page_Init code. The ITemplate property is used to define the layout area for users of the user control. The Page_Init code is where you instantiate the naming container you created and connect it to the layout template. In addition, the code-behind file should contain any properties you want the user to be able to access from the user control. In our example, we would probably define an Address property that exposes a custom Address class (not shown). This class contains the address properties discussed previously. The following shows an example of the code-behind file for the Address user control.
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The Address User Control s Code-Behind File Sample of Visual Basic Code Partial Class AddressUcTemplated Inherits System.Web.UI.UserControl Public Sub Page_Init(ByVal sender As Object, _ ByVal e As EventArgs) Handles Me.Init 'clear the controls from the placeholder PlaceHolderAddressTemplate.Controls.Clear() If LayoutTemplate Is Nothing Then PlaceHolderAddressTemplate.Controls.Add( _ New LiteralControl("No template defined.")) Else Dim container As New AddressUcContainer(Me.Address) Me.LayoutTemplate.InstantiateIn(container) 'add the controls to the placeholder PlaceHolderAddressTemplate.Controls.Add(container) End If End Sub Private _layout As ITemplate <PersistenceMode(PersistenceMode.InnerProperty)> _ <TemplateContainer(GetType(AddressUcContainer))> _ Public Property LayoutTemplate() As ITemplate Get Return _layout End Get Set(ByVal value As ITemplate) _layout = value End Set End Property
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