.NET/ASP.NET/C#/VB.NET PDF Document SDK

Load Profile Per Second ~~~~~~~~~~~~ -----------------... Parses: 109.5 Hard parses: 23.4 ... Instance Efficiency Indicators ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Buffer Nowait %: 100.00 Buffer Hit %: 99.99 Library Hit %: 95.24 Execute to Parse %: 96.18 Parse CPU to Parse Elapsd %: 90.63

Per Transaction Per Exec Per Call ----------------- ----------- ----------547.5 117.0

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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.

Redo NoWait %: Optimal W/A Exec %: Soft Parse %: Latch Hit %: % Non-Parse CPU:

99.99 100.00 78.63 100.00 86.88

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.

Top 5 Timed Events Avg %Total ~~~~~~~~~~~~~~~~~~ wait Call Event Waits Time (s) (ms) Time ----------------------------------------- ------------ ----------- ------ -----CPU time 4 86.1 log file parallel write 66 0 6 7.8

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

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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.

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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.

That is quite dramatic: from 32 CPU seconds in the no bind variables example to 4 CPU seconds here. From 652 hard parses per second to 23 per second (and based on my knowledge of how statspack works, most of those were from running statspack!). Even the elapsed time was dramatically reduced from about 39 seconds down to 10 seconds. When not using bind variables, we spent seven-eighths of our CPU time parsing SQL (4 seconds versus 32). This was not entirely latch related, as much of the CPU time incurred without bind variables was spent parsing and optimizing the SQL. Parsing SQL is very CPU intensive, but to expend seven-eighths of our CPU doing something (parsing) that doesn t really do useful work for us work we didn t need to perform is pretty expensive. When we get to the two-user test, the results continue to look better: Elapsed: DB time: 0.33 (mins) Av Act Sess: 0.36 (mins) DB CPU: 1.1 0.35 (mins)

Load Profile Per Second ~~~~~~~~~~~~ -----------------... Parses: 56.4 Hard parses: 12.2 ... Instance Efficiency Indicators ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Buffer Nowait %: 100.00 Buffer Hit %: 99.99 Library Hit %: 97.43 Execute to Parse %: 97.90 Parse CPU to Parse Elapsd %: 80.60

One of the simplest uses of reflection is to access the representation of types and generic type variables using the typeof operator. For example, typeof<int> and typeof<'a> are both expressions that generate values of type System.Type. Given a System.Type value, you can use the .NET APIs to access the System.Reflection.Assembly value that represents the .NET assembly that contains the definition of the type (.NET assemblies are described in 7). You can also access other types in the System.Reflection namespace such as MethodInfo, PropertyInfo, MemberInfo, and ConstructorInfo. For example, here we examine the names associated with some common types: > let intType = typeof<int>;; val intType : System.Type > intType.FullName;; val it : string = "System.Int32" > intType.AssemblyQualifiedName;; val it : string = "System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" > let intListType = typeof<int list>;; val intListType : System.Type > intListType.FullName;; val it : string = "Microsoft.FSharp.Collections.List`1[[System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]"