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external members are different from those of BackgroundWorker. The .NET documentation recommends that you use implementation inheritance for this, but we disagree. Implementation inheritance can only add complexity to the signature of an abstraction and never makes things simpler, whereas an IterativeBackgroundWorker is in many ways simpler than using a BackgroundWorker, despite that it uses an instance of the latter internally. Powerful, compositional, simple abstractions are the primary building blocks of functional programming.

Resources such as bitmaps and error strings, often used for localizing websites to multiple languages. Resources were described in passing in 7. These files use the .NET resource schema. Many websites use relational databases heavily. Operations on these databases are typically described using scripts written in database scripting languages such as T-SQL. Cascading Style Sheets, a W3C standard for declarative configuration of the HTML presentation layer. CSS fragments can also appear in HTML and ASPX documents. Similar to the .aspx file but used as a template for other pages in the website. When used with a page, the content page must fill the placeholders declared in the master page.

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Let s assume you want to add a command to the server to show the current disk usage of all of the databases in the server Although there are external tools that can retrieve this information, you desire a SQL equivalent function that you can easily use in your own databasedriven applications Let s also assume you want to add this as a SHOW command Specifically, you want to be able to execute the command SHOW DISK_USAGE and retrieve a result set that has each database listed as a row along with the total size of all of the files (tables) listed in kilobytes Adding a new SQL command involves adding symbols to the lexical analyzer and adding the SHOW DISK_USAGE command syntax to the YACC parser (sql_yaccyy).

Often, you need to raise additional events from objects that follow the BackgroundWorker design pattern. For example, let s say you want to augment IterativeBackgroundWorker to raise an event when the worker starts its work and for this event to pass the exact time that the worker thread started as an event argument. Listing 13-3 shows the extra code you need to add to the IterativeBackgroundWorker type to make this happen. You use this extra code in the next section. Listing 13-3. Code to Raise GUI-Thread Events from an IterativeBackgroundWorker Object open System open System.Threading // Pseudo-code for adding event-raising to this object type IterativeBackgroundWorker<'T>(...) = let worker = ... // The constructor captures the synchronization context. This allows us to post // messages back to the GUI thread where the BackgroundWorker was created. let syncContext = SynchronizationContext.Current do if syncContext = null then failwith "no synchronization context found" let started = new Event<_>() // Raise the event when the worker starts. This is done by posting a message // to the captured synchronization context. do worker.DoWork.Add(fun args -> syncContext.Post(SendOrPostCallback(fun _ -> started.Trigger(DateTime.Now)), state=null) ... /// The Started event gets raised when the worker starts. It is /// raised on the GUI thread (i.e. in the synchronization context of /// the thread where the worker object was created). // It has type IEvent<DateTime> member x.Started = started.Publish The simple way to raise additional events is often wrong. For example, it s tempting to create an event, arrange for it to be triggered, and publish it, as you would do for a GUI control. However, if you

Defines the structure of the website and can be used with ASP.NET navigation controls to generate content like a menu bar, a breadcrumb, or a site map. Many websites use databases accessed via SQL Server Express 2005. The .mdf format is a detached, file-based database used by SQL Server Express.

The new parser must be compiled into a C program by Bison and then a new lexical hash created using the gen_lex_hash utility described earlier The code for the parser to direct control to the new command is placed in the large case statement in sql_parsecc with a case for the new command symbol Let s begin with adding the symbols to the lexical analyzer Open the lexh file and locate the static SYMBOL symbols[] array You can make the symbol anything you want, but it should be something meaningful (like all good variable names) Be sure to choose a symbol that isn t already in use In this case, use the symbol DISK_USAGE This acts like a label to the parser identifying it as a token Place a statement in the array to direct the lexical analyzer to generate the symbol and call it DISK_USAGE_SYM.

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