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do that, you end up triggering the event on the background worker thread, and its event handlers run on that thread. This is dangerous, because most GUI objects (and many other objects) can be accessed only from the thread they were created on; this is a restriction enforced by most GUI systems.

Caution Although this book is primarily about programming in F#, be aware that typically only a small

The list is in (roughly) alphabetic order, so place it in the proper location Listing 8-17 shows an excerpt of the array with the symbols added Listing 8-17 Updates to the lexh File for the SHOW DISK_USAGE Command static SYMBOL symbols[] = { { "&&", SYM(AND_AND_SYM)}, .. { "DISK", SYM(DISK_SYM)}, /* BEGIN CAB MODIFICATION */ /* Reason for Modification: */ /* This section identifies the tokens for the SHOW DISK_USAGE command*/ { "DISK_USAGE", SYM(DISK_USAGE_SYM)}, /* END CAB MODIFICATION */ { "DISTINCT", SYM(DISTINCT)}, .. The next thing you need to do is add a mnemonic to identify the command This mnemonic will be used in the parser to assign to the internal query structure and to control the flow of execution via a case in the large switch statement in the sql_parsecc file Open the sql_lexh file and add the new command to the enum_sql_command enumeration.

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Note One of the nice features of the BackgroundWorker class is that it automatically arranges to raise the

portion of a website s content is ultimately represented in F# itself. Indeed, one valid model for using F# on the server side is to simply use it to author custom controls and static DLLs that are referenced by server-side components authored using more standard web programming languages such as C# or Visual Basic. This is easy to do since C# and Visual Basic code can access compiled F# code directly, as discussed in 19. You can find out more about this option at http://www.expert-fsharp.com/Topics/WebDevelopment.

RunWorkerCompleted and ProgressChanged events on the GUI thread. Listing 13-3 shows how to achieve this.

Listing 8-18 shows the modifications with the new command mnemonic Listing 8-18 Changes to the sql_lexh File for the SHOW DISK_USAGE Command enum enum_sql_command { SQLCOM_SELECT, SQLCOM_CREATE_TABLE, SQLCOM_CREATE_INDEX, SQLCOM_ALTER_TABLE, SQLCOM_UPDATE, SQLCOM_INSERT, SQLCOM_INSERT_SELECT, SQLCOM_DELETE, SQLCOM_TRUNCATE, SQLCOM_DROP_TABLE, SQLCOM_DROP_INDEX, ....

The final topics we cover in this chapter are F# quotations, which provide a way to get at a representation of F# expressions as abstract syntax trees, and reflection, which lets you get at representations of assemblies, type definitions, and member signatures. Let s look at reflection first.

Technically speaking, the extended IterativeBackgroundWorker object captures the synchronization context of the thread where it was created and posts an operation back to that synchronization context. A synchronization context is an object that lets you post operations back to another thread. For threads such as a GUI thread, this means that posting an operation posts a message through the GUI event loop.

SQLCOM_SHOW_COLUMN_TYPES, SQLCOM_SHOW_STORAGE_ENGINES, SQLCOM_SHOW_PRIVILEGES, /* BEGIN CAB MODIFICATION */ /* Reason for Modification: */ /* This section captures the enumerations for the SHOW DISK_USAGE command tokens */ SQLCOM_SHOW_DISK_USAGE, /* END CAB MODIFICATION */ SQLCOM_HELP, SQLCOM_CREATE_USER, SQLCOM_DROP_USER, SQLCOM_RENAME_USER, ... Now that you have the new symbol and the command mnemonic, you now need to add code to the sql_yacc.yy file to define the new token that you used in the lex.h file and add the source code for the new SHOW DISK_USAGE SQL command. Open the sql_yacc.yy file and add the new token to the list of tokens (near the top). These are defined (roughly) in alphabetical order, so place the new token in the proper order. Listing 8-19 shows the modifications to the sql_yacc.yy file. Listing 8-19. Adding the Token to the sql_yacc.yy File ... %token DISK_SYM /* BEGIN CAB MODIFICATION */ /* Reason for Modification: */ /* This section defines the tokens for the SHOW DISK_USAGE command */ %token DISK_USAGE_SYM /* END CAB MODIFICATION */ %token DISTINCT ...

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