crystal reports 2011 qr code THE ASP.NET REQUEST PIPELINE in C#.NET

Creation ECC200 in C#.NET THE ASP.NET REQUEST PIPELINE

CHAPTER 2 THE ASP.NET REQUEST PIPELINE
Generate Data Matrix In C#
Using Barcode drawer for Visual Studio .NET Control to generate, create ECC200 image in Visual Studio .NET applications.
www.OnBarcode.com
Data Matrix ECC200 Recognizer In Visual C#
Using Barcode decoder for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Built-in Framework Extensions to the Pipeline
Printing Linear In Visual C#.NET
Using Barcode creator for .NET framework Control to generate, create Linear image in .NET framework applications.
www.OnBarcode.com
Create Code 128 Code Set B In C#.NET
Using Barcode printer for Visual Studio .NET Control to generate, create Code 128 Code Set A image in Visual Studio .NET applications.
www.OnBarcode.com
One of the best ways to understand how to use the request processing pipeline is to examine the examples that ship with the Framework. Much of the functionality that ships with ASP .NET is implemented by extending this pipeline. We ll examine these extensions in this section. Each of the events in the pipeline can actually be captured by n different implementations of traps for these methods. Table 2-3 provides a summary of the traps implemented for canned Framework functionality. Table 2-3. Summary of Built-in Framework Modules and Events They Trap
Barcode Creator In Visual C#.NET
Using Barcode generator for .NET Control to generate, create Barcode image in VS .NET applications.
www.OnBarcode.com
Encode EAN-13 Supplement 5 In C#
Using Barcode generator for VS .NET Control to generate, create EAN 13 image in VS .NET applications.
www.OnBarcode.com
Module
ECC200 Creation In C#.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create Data Matrix image in Visual Studio .NET applications.
www.OnBarcode.com
UPCE Creator In C#.NET
Using Barcode generator for Visual Studio .NET Control to generate, create Universal Product Code version E image in VS .NET applications.
www.OnBarcode.com
Windows Authentication
Reading Data Matrix ECC200 In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Data Matrix 2d Barcode Generator In Visual Studio .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create Data Matrix 2d barcode image in .NET applications.
www.OnBarcode.com
Enters
Make Matrix In .NET Framework
Using Barcode encoder for ASP.NET Control to generate, create Matrix Barcode image in ASP.NET applications.
www.OnBarcode.com
USS-128 Generation In None
Using Barcode creation for Microsoft Excel Control to generate, create UCC.EAN - 128 image in Office Excel applications.
www.OnBarcode.com
AuthenticateRequest
Barcode Maker In Visual Basic .NET
Using Barcode printer for Visual Studio .NET Control to generate, create Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Barcode Generator In Objective-C
Using Barcode creator for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
Leaves
Draw EAN / UCC - 13 In None
Using Barcode encoder for Software Control to generate, create EAN-13 image in Software applications.
www.OnBarcode.com
DataMatrix Recognizer In Visual C#.NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
None
Making GS1 - 13 In Objective-C
Using Barcode generation for iPad Control to generate, create EAN-13 image in iPad applications.
www.OnBarcode.com
EAN / UCC - 13 Recognizer In .NET
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Notes
Make Code 128 Code Set B In Objective-C
Using Barcode encoder for iPad Control to generate, create Code 128C image in iPad applications.
www.OnBarcode.com
Make Code-39 In VS .NET
Using Barcode generation for ASP.NET Control to generate, create Code 39 Extended image in ASP.NET applications.
www.OnBarcode.com
If the configuration is set to use Windows security within the ASP.NET Framework (and anonymous access is off at the IIS level), this method loads the user name out of the server variables and creates an instance of the Windows Principal to populate the User property of the context. If the configuration is set to use Forms-based authentication, this module verifies the existence of the authentication ticket and redirects the user to the login page if it s not present. The EndRequest trap deals with a redirect to the originally requested URL after the user first logs in. You can leverage Passport authentication using the Passport SDK. (See 5 for details.) The Role Manager allows the membership provider to store a role-based resource authorization. PreAuthorizeRequest populates the user object with the roles by loading the roles for the user through the membership API. EndRequest saves this information as a cookie, so it doesn t have to be reloaded with each request.
Forms Authentication
AuthenticateRequest
EndRequest
Passport Authentication
AuthenticateRequest
EndRequest
Role Manager
PreAuthorizeRequest
EndRequest
CHAPTER 2 THE ASP.NET REQUEST PIPELINE
Module
URL Authorization
Enters
AuthorizeRequest
Leaves
None
Notes
This trap checks with the configuration file to make sure users have access to the resource. It sets the status code to a security violation if they don t. If this is the case, it terminates the processing of the request with a call to HttpApplication. CompleteRequest. Makes sure the requesting users have NT permissions to access the file. Returns a security exception status and terminates processing of the request if they don t. This module creates the anonymous identification cookie in PostAuthenticate request if it doesn t already exist (and anonymous identification is enabled). This module also uses PostAcquireRequestState to alter the URL when cookieless anonymous identification is being used. The Profile module uses these traps to communicate with the personalization provider to load and store personalization data from persistence. These events were added specifically to implement output caching. This is where, upon entering, the Output Cache module checks incoming requests to see if they match an entry in the cache, and then when it s leaving, it updates the cache with the output if the OutputCache directive directs it to do so.
Continued
File Authorization
AuthorizeRequest
None
Anonymous Identification
PostAuthenticateRequest
None
Profile
AcquireRequestState
EndRequest
Output Cache
ResolveRequestCache
UpdateRequestCache
CHAPTER 2 THE ASP.NET REQUEST PIPELINE
Table 2-3. Continued
Module
Session
Enters
AcqureRequestState
Leaves
ReleaseRequestState
Notes
The Session module uses these events to retrieve and return state variables from persistence, as selected in configuration. EndRequest is also trapped to be sure the ReleaseRequestState was successfully called (relevant when request processing is terminated programmatically). There is also a Session ID module that is used to manage cookieless session IDs.
You can see from Table 2-3 that much of the functionality the Framework provides is implemented as request processing pipeline extensions. This architecture is similar to the out-of-band processing in Web Services that so many WS-* specifications describe. Notice how many security-related modules are implemented for the Framework. Security is a natural candidate for out-of-band processing because it s functionality you want applied to every request. It s code you want to keep out of page-specific code files because it applies to all requests and you don t want to have to repeat some logic on a page-by-page basis to enforce it. There are also many modules for ASP .NET 2.0 that leverage the new, built-in provider pattern. This pattern is a layer of abstraction that allows you to store information in a manner that the consuming code neither knows nor cares about. There are two implementations of the pattern that ship with ASP .NET 2.0: one for Active Directory and one for SQL Server. You can also do your own implementation of the provider pattern if you want to use your own, pre-existing, underlying data stores for persistence. These providers are leveraged by these APIs: membership, personalization, and roles.
Copyright © OnBarcode.com . All rights reserved.