authorize.net error code 128 Extending the controller in .NET framework

Printing ANSI/AIM Code 128 in .NET framework Extending the controller

Extending the controller
Encode Code 128B In Visual Studio .NET
Using Barcode generation for ASP.NET Control to generate, create Code-128 image in ASP.NET applications.
www.OnBarcode.com
Encoding PDF 417 In VS .NET
Using Barcode generation for ASP.NET Control to generate, create PDF-417 2d barcode image in ASP.NET applications.
www.OnBarcode.com
box, you re not out of luck the MVC Framework gives you full control to implement your own controller, which could act radically differently than the one provided in the framework.
GS1 - 12 Generation In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create UPC A image in ASP.NET applications.
www.OnBarcode.com
Printing USS Code 128 In Visual Studio .NET
Using Barcode creation for ASP.NET Control to generate, create Code-128 image in ASP.NET applications.
www.OnBarcode.com
Controller extensibility
Barcode Printer In .NET
Using Barcode generation for ASP.NET Control to generate, create Barcode image in ASP.NET applications.
www.OnBarcode.com
Barcode Generator In Visual Studio .NET
Using Barcode encoder for ASP.NET Control to generate, create Barcode image in ASP.NET applications.
www.OnBarcode.com
The default controller implementation comes with some specific ideas about how action methods are selected, executed, and extended. This functionality comes from the Controller base class in the ASP.NET MVC framework, which is the default implementation of the IController interface. IController is a simple interface that provides a single method, Execute(), and you could choose to implement it directly. By implementing this interface, you can still use the routing and controller factory functionality of the framework and push the rest of the framework to the side. You can see the IController interface definition in figure 9.1. A second extensibility option is available that isn t as lean as implementing IController. The framework contains a ControllerBase Figure 9.1 The IController interface exposes a single method, Execute(). class that provides the most basic properties for managing ViewData and TempData. The ControllerBase class is listed in figure 9.2. It s a pretty minimal class but it still lets you take advantage of some concepts that are shared with the view. Although the interface and base class extensibility points exist in the framework, few developers and projects trade the productivity built into the framework s controller class for the power and extra work that s needed to implement their own IController implementation. The same goes for using the ControllerBase class. We needn t sacrifice productivity because a number of Figure 9.2 The ControllerBase class provides integration with routing as well as HttpContext. extensibility points are built into the Controller class. We ll cover them next.
QR Code JIS X 0510 Maker In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create QR Code JIS X 0510 image in ASP.NET applications.
www.OnBarcode.com
Generating EAN 8 In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create EAN / UCC - 8 image in ASP.NET applications.
www.OnBarcode.com
Action, authorization, and result filters
Code-128 Maker In VB.NET
Using Barcode maker for VS .NET Control to generate, create Code-128 image in Visual Studio .NET applications.
www.OnBarcode.com
Read Code 128 Code Set C In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Controller actions
Encode QR Code 2d Barcode In None
Using Barcode maker for Font Control to generate, create Denso QR Bar Code image in Font applications.
www.OnBarcode.com
Painting QR Code 2d Barcode In Java
Using Barcode creation for BIRT Control to generate, create QR Code image in BIRT applications.
www.OnBarcode.com
Actions are the methods that control the main logic of each server request, but not all methods of a controller class qualify to be an action. The requirements for a method to be web-callable as an action method are well documented on Microsoft s ASP.NET MVC site (www.asp.net/mvc). To be considered as an action, the method must meet the following requirements:
Barcode Reader In .NET
Using Barcode decoder for .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Barcode Printer In Java
Using Barcode drawer for BIRT reports Control to generate, create Barcode image in BIRT applications.
www.OnBarcode.com
It must be public. It can t be static. It can t be an extension method. It can t be a constructor, getter, or setter. It can t have open generic types. It can t be a method of the Controller base class. It can t be a method of the ControllerBase base class. It can t contain ref or out parameters.
Drawing GTIN - 13 In None
Using Barcode maker for Software Control to generate, create GTIN - 13 image in Software applications.
www.OnBarcode.com
Paint European Article Number 13 In .NET Framework
Using Barcode maker for Reporting Service Control to generate, create European Article Number 13 image in Reporting Service applications.
www.OnBarcode.com
If a method doesn t meet all these requirements, it isn t an action method. Now that you can identify action methods, we ll discuss how to modify their behavior.
Recognizing EAN 13 In VB.NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Barcode Generator In C#.NET
Using Barcode creator for VS .NET Control to generate, create Barcode image in VS .NET applications.
www.OnBarcode.com
Action, authorization, and result filters
USS Code 39 Encoder In None
Using Barcode drawer for Microsoft Word Control to generate, create Code 39 Extended image in Office Word applications.
www.OnBarcode.com
Painting UPC Code In Visual Studio .NET
Using Barcode generator for Reporting Service Control to generate, create UPC-A image in Reporting Service applications.
www.OnBarcode.com
The first extensibility point of actions is through an ActionFilter. This extensibility point allows you to intercept the execution of an action and inject behavior before or after the action is executed. This is similar to aspect-oriented programming, which is a technique for applying cross-cutting concerns to a code base without having lots of duplicate code to maintain. The easiest way to implement an action filter is to create a class that inherits from ActionFilterAttribute, although it s also possible to override methods on the Controller class itself. Figure 9.3 shows the methods of ActionFilterAttribute that can be overridden to modify an action. This attribute implements the IActionFilter and IResultFilter interfaces, each of which provides different extensibility points.
Figure 9.3 The action filter methods that can be overridden to modify an action.
Extending the controller
The new ChildActionOnlyAttribute action filter shipped with MVC 2. This filter implements the IAuthorizationFilter interface and is used by the framework to ensure that an action is only called from the RenderAction() method within a view. An action that has this attribute can t be called through a top-level route and isn t web callable. The code in listing 9.1 shows the ChildActionOnlyAttribute applied to the ChildAction method.
Copyright © OnBarcode.com . All rights reserved.