- Home
- Products
- Integration
- Tutorial
- Barcode FAQ
- Purchase
- Company
Creating Custom ASP.NET Server Controls in Visual Basic .NET
Creating Custom ASP.NET Server Controls Make Data Matrix In Visual Basic .NET Using Barcode maker for VS .NET Control to generate, create Data Matrix 2d barcode image in .NET framework applications. www.OnBarcode.comScanning Data Matrix 2d Barcode In VB.NET Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET applications. www.OnBarcode.comYou can create new server controls for ASP.NET on two conceptual levels: user controls and custom (web) server controls. User controls are similar to web forms: they re a collection of server control and/or HTML markup, which is named (declared) and then used via reference. They can also expose public properties that you can set to control various aspects of the user control. This chapter considers only user controls. User controls are contained in .ascx files. You can create a new user control in Visual Studio by selecting the Web User Control template from the New/File menu option. The new user control is empty except for a Control directive that acts similarly to the Page directive of a web form. You can add any additional markup as needed. As an example, consider a user control that repeats a given text fragment a specified number of times. This user control (RepeatText.ascx in Listing 14-10) contains a single control: a placeholder label. The code-behind file is located in RepeatText.ascx.fs, shown in Listing 14-11. Painting Data Matrix ECC200 In VB.NET Using Barcode creation for Visual Studio .NET Control to generate, create ECC200 image in Visual Studio .NET applications. www.OnBarcode.comPDF 417 Creator In Visual Basic .NET Using Barcode encoder for VS .NET Control to generate, create PDF 417 image in Visual Studio .NET applications. www.OnBarcode.comCHAPTER 14 BUILDING SMART WEB APPLICATIONS
Linear Maker In VB.NET Using Barcode maker for Visual Studio .NET Control to generate, create Linear 1D Barcode image in VS .NET applications. www.OnBarcode.comPrint UPC Symbol In Visual Basic .NET Using Barcode maker for .NET framework Control to generate, create UCC - 12 image in .NET applications. www.OnBarcode.comListing 14-10. RepeatText.ascx: A Simple User Control Implemented in F# <%@ Control Language="F#" AutoEventWireup="true" CodeFile="RepeatText.ascx.fs" Inherits="MyUserControl.RepeatText" %> <asp:Label ID="Place" runat="server"/> Listing 14-11. RepeatText.ascx.fs: The Implementation of an ASP.NET User Control namespace MyUserControl open System open System.Web.UI.WebControls type RepeatText() = inherit System.Web.UI.UserControl() /// This is the internal state and parameters of the control let mutable text = "" let mutable count = 0 /// This internal control is initialized by ASP.NET [<DefaultValue>] val mutable Place : Label /// These properties allow the state to be used from the page member self.Text with get() = text and set(v) = text <- v member self.RepeatCount with get() = count and set(v) = count <- v /// This event is automatically wired up through the use of the /// AutoEventWireup ASP.NET directive (true by default) member self.Page_Load (sender: obj, e: EventArgs) = let acc = new Text.StringBuilder() for i in 1..count do acc.Append(self.Text) |> ignore self.Place.Text <- acc.ToString() The state and parameters of the control are ultimately held in the variables text and count. Note how you define public properties (Text and RepeatCount) that are available when you use the control from a page. All you need to do to use this user control from a page is to register it using the Register directive, giving a tag prefix and a tag name by which you can refer to it. For example, the code in Listing 14-12 results in an HTML label element containing the text Monkey! 10 times. Listing 14-12. TestRepeat.aspx: Using the Control from Listing 14-4 <%@ Page AutoEventWireup="true" %> <%@ Register Src="RepeatText.ascx" TagName="Repeater" TagPrefix="text" %> <!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"> Code128 Creator In Visual Basic .NET Using Barcode creator for VS .NET Control to generate, create Code 128C image in .NET applications. www.OnBarcode.comUSD-4 Generator In Visual Basic .NET Using Barcode printer for .NET framework Control to generate, create Codabar image in .NET applications. www.OnBarcode.comCHAPTER 14 BUILDING SMART WEB APPLICATIONS
Creating Data Matrix In Visual Studio .NET Using Barcode generator for ASP.NET Control to generate, create Data Matrix 2d barcode image in ASP.NET applications. www.OnBarcode.comMaking Data Matrix In Objective-C Using Barcode creator for iPad Control to generate, create Data Matrix image in iPad applications. www.OnBarcode.com<head runat="server"> <title>My User Control Test</title> </head> <body> <form runat="server"> <text:Repeater id="chart" runat="server" RepeatCount="10" Text="Monkey!" /> </form> </body> </html> Barcode Scanner In .NET Using Barcode Control SDK for ASP.NET Control to generate, create, read, scan barcode image in ASP.NET applications. www.OnBarcode.comQR Code 2d Barcode Maker In Visual C# Using Barcode printer for Visual Studio .NET Control to generate, create QR Code ISO/IEC18004 image in .NET applications. www.OnBarcode.comBuilding Ajax Rich Client Applications
Encode Quick Response Code In Java Using Barcode creator for Eclipse BIRT Control to generate, create QR Code ISO/IEC18004 image in BIRT reports applications. www.OnBarcode.comPrinting UPC-A Supplement 5 In None Using Barcode creation for Online Control to generate, create UPC-A image in Online applications. www.OnBarcode.comSo far in this chapter, you ve looked at programming server-side web applications. In recent years, a new class of rich-client web applications has emerged, leading to what is commonly called the Ajax development paradigm. This is a general term for any web application that incorporates substantial amounts of code executed on the client side of the application by running JavaScript in the web browser. You can develop Ajax applications in at least three ways using F#: You can manually write and serve additional JavaScript files as part of your web application. This isn t hard, but you don t benefit from existing frameworks. You can use the Ajax support via ASP.NET and develop Ajax web applications with F# code-behind files or F# library code exposed via C# or VB code-behind. You can use the WebSharper platform to write both client and server code in F#. Barcode Recognizer In VB.NET Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET framework applications. www.OnBarcode.comPrint GS1 - 13 In .NET Framework Using Barcode creator for ASP.NET Control to generate, create GTIN - 13 image in ASP.NET applications. www.OnBarcode.comDeveloping Ajax applications with the first two techniques follows a fairly standard path mostly independent of F#. The remainder of this section gives a brief overview of some of the core WebSharper features, including pagelets, formlets, and flowlets. Encode USS-128 In Java Using Barcode generation for Java Control to generate, create EAN / UCC - 14 image in Java applications. www.OnBarcode.comMaking Denso QR Bar Code In VS .NET Using Barcode generator for Reporting Service Control to generate, create Quick Response Code image in Reporting Service applications. www.OnBarcode.comScan Code 128 Code Set A In Visual Basic .NET Using Barcode reader for .NET Control to read, scan read, scan image in VS .NET applications. www.OnBarcode.comReading Barcode In Java Using Barcode decoder for Java Control to read, scan read, scan image in Java applications. www.OnBarcode.com |
|