ASP'NET Internals

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ASP.NET Internals
Dan.Amiga_at_develop.com 972-52-3030304
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Disclaimer
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Game plan

• Understanding and utilizing ASP.NET
• Goal Leave you with a solid end-to-end
  understanding the ASP.NET Pipeline

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W3WP.EXE
ASP.NET ISAPI
http.sys
AppDomain
HttpRuntime
HTTP
CONENT
HttpApplicationFactory
HttpApplication
HttpContext
e
e
HttpModule
PageHandlerFactory
PageHandler
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Dynamic web content

• Dynamic content over a stateless protocol
• Dynamically generated HTML requires server host
  and a supporting engine
• Engines include CGI,ISAPI,ASP,ASP.NET
• ASP.NET custom host
• Cassini, VS Development server.

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ASP.NET on IIS 6.0

• IIS6
• AppPool model
• Limited customization
• ASP.NET
• ISAPI Extension
• Only processes ASP.NET requests

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ASP.NET on IIS 7.0

• ASP.NET Modes
• ISAPI mode (compat)
• Integrated mode
• ASP.NET HttpModules plug directly into server
• HttpModules or Global.asax events can run code on
  all requests
• VB and C code can be easily used to customize
  and extend the server

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.NET Runtime host

• What is a .NET runtime host?
• What does it mean to be a runtime host?
• Who can be a runtime host?

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W3WP.EXE
http.sys
.NET Runtime ASP.NET
SQL Server
.NET Runtime
Window Application
.NET runtime and ASP.NET
Everyone can be .NET Runtime host ASP.NET host
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ASP.NET runtime

• ASP.NET is an extensible HTTP processing
  architecture
• System.Web.Hosting.ISAPIRuntime
• HttpRuntime for host interaction
• HttpApplication for managing requests
• HttpContext ECB a like
• Request,Response,Session,Cache,User

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Request from host
AppDomain
Pool
HttpRuntime
HttpApplication
HttpApplication
HttpApplication
HttpApplication
HttpApplication
HttpApplicationFactory
HttpApplication
HttpContext
HttpContext
ASP.NET Runtime
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Handlers

• Code that responds to a request for a specific
  URL
• Responsible for generating HTTP response
• Implement IHttpHandler
• ASPX pages implement IHttpHandler
• Asynchronous Handlers

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Http Handler
BeginRequest()
HttpApplication
AuthenticateRequest()
Init
AuthorizeRequest()
HttpModule
HttpModule
ResolveRequestCache()
HttpModule
AcquireRequestState()
HttpModule
HttpModule
PreRequestHandlerExecute()
HttpModule
HttpModule
PostRequestHandlerExecute()
HttpModule
ReleaseRequestState()
UpdateRequestCache()
EndRequest()
IHttpHandler
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Asynchornous Handlers
Worker thread pool
QueueUserWorkItem
IO thread pool
HttpApplication
cb()
EndProcessRequest()
Async I/O
EndRead()
Stream
BeginProcessRequest(AsyncCallBack cb)
BeginRead(cb)
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Handler factories

• Allows custom initialization of handlers
• Used by ASP.NET to demand compile pages
• Implement IHttpHandlerFactory
• Great extensibility mechanism
• Combined with PageParser
• Examples
• PageHandlerFactory (VirtualPath)
• HttpRemotingHandlerFactory
• WebServiceHandlerFactory (syncSessionHandler)

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HttpApplication
PageHandlerFactory
PageHandler1
PageHandler2
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Virtual Path Providers

• Processing requests requires an endpoint
• typically endpoint is ASPX from the file system
• Virtual path providers allow virtualization of
  file system
• allows for alternate store of pages or any file
• typical use is DB store for website files and/or
  content
• Must provide classes that represents files or
  directories

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HttpApplication
Virtual Path Providers
Virtual Path Providers
Virtual Path Providers
Virtual Path Providers
PageHandlerFactory
PageHandler1
PageHandler2
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HttpModules

• Handle events for pre/post processing
• Before After handler is executed
• Always executes with HttpContext in scope
• Can choose to halt request processing

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HTTP Modules
HttpContext
BeginRequest()
HttpApplication
AuthenticateRequest()
Init
AuthorizeRequest()
HttpModule
HttpModule
ResolveRequestCache()
HttpModule
AcquireRequestState()
HttpModule
HttpModule
PreRequestHandlerExecute()
HttpModule
HttpModule
PostRequestHandlerExecute()
HttpModule
ReleaseRequestState()
UpdateRequestCache()
EndRequest()
PageHandler/Factory
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Summary
W3WP.EXE
ASP.NET ISAPI
http.sys
AppDomain
HttpRuntime
HTTP
CONENT
HttpApplicationFactory
HttpApplication
HttpContext
e
e
HttpModule
PageHandlerFactory
PageHandler
The entire HTTP Pipeline
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ASP.NET Internals
Dan.Amiga_at_develop.com 972-52-3030304
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ASP.NET Internals
Dan Amiga Senior Consultant, Advantech Instructor,
DevelopMentor http//blogs.microsoft.co.il/amiga
dan_at_advantech.co.il Dan.amiga_at_develop.com
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Compilation

• Explain page compilation
• Demand compilation
• BuildProviders
• CompilationMode Never
• No code but Eval,Bind,ExpressionBuilders apply

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Build Providers
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System.Web.UI.Page
Partial class files compiled into a single class
Framework Generated file
Your code behind
ASPX Page Markup