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System.ComponentModel System.Configuration System.Data System.Diagnostics System.Drawing
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System.Globalization
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System.Reflection
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System.Reflection.Emit System.Resources
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CHAPTER 10 US IN G THE F# A ND .NE T LIBRARIES
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Table 10-2. Namespaces in the DLLs from Table 10-1, with MSDN Descriptions (Continued)
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Namespace
System.Text
Description
Types representing ASCII, Unicode, UTF-8, and other character encodings. Also abstract types for converting blocks of characters to and from blocks of bytes. See s 3 and the section Using Regular Expressions and Formatting later in this chapter. Types for creating and synchronizing threads. See 13. Types that enable web applications. See 14. Types for creating windowed applications. See 11. Types that implement standards-based support for processing XML. See s 9 and 15. Types that wrap Win32 API common dialog boxes and components. Not covered in this book.
System.Threading System.Web System.Windows.Forms System.Xml Microsoft.Win32
Namespaces from the F# Libraries
Table 10-3 shows the primary namespaces in F# library DLLs from Table 10-1. The following are opened by default in F# code: Microsoft.FSharp.Core Microsoft.FSharp.Collections Microsoft.FSharp.Control Microsoft.FSharp.Text Table 10-3. Namespaces in the DLLs from Table 10-1
Namespace
Microsoft.FSharp.Core Microsoft.FSharp.Collections
Description
Provides primitive constructs related to the F# language such as tuples. See 3. Provides functional programming collections such as sets and maps implemented using binary trees. See 3 and the section Using Further F# and .NET Data Structures later in this chapter. Provides functional programming control structures including asynchronous and lazy programming. 8 covers programming with the IEvent<'a> type and the IEvent module, and 13 covers the Async<'a> type. Provides types for structured and printf-style textual formatting of data. See 4 for an introduction to printf formatting. Provides extensions to the System.Reflection functionality that deal particularly with F# record and discriminated union values. See 9 for a brief introduction, and see the section Further Libraries for Reflective Techniques section later in this chapter for more details. Provides access to F# expressions as abstract syntax trees. See 9.
Microsoft.FSharp.Control
Microsoft.FSharp.Text
Microsoft.FSharp.Reflection
Microsoft.FSharp.Quotations
CHAPTER 10 US IN G THE F# A ND .NE T LIBRARIES
Using the System Types
Table 10-4 shows some of the most useful core types from the System namespace. These types are particularly useful because they take real care to define correctly.
Table 10-4. Useful Core Types from the System Namespace
Function
System.DateTime System.DayOfWeek System.Decimal
Description
A type representing a date and time An enumeration type representing a day of the week A numeric type suitable for financial calculations requiring large numbers of significant integral and fractional digits and no roundoff errors A type representing a 128-bit globally unique ID A type with an underlying value type 'a but that can be assigned null like a reference type A type representing a time interval A type representing a uniform resource identifier (URI), such as an Internet URL
System.Guid System.Nullable<'a> System.TimeSpan System.Uri
The following session shows some sample uses of the DateTime type: > open System;; > DateTime.Parse("13 July 1968");; val it : DateTime = 13/07/1968 00:00:00 {Day = 13; DayOfWeek = Saturday; DayOfYear = 195; Hour = 0; Millisecond = 0; Minute = 0; Month = 7; Second = 0; Ticks = 620892000000000000L; TimeOfDay = 00:00:00; Year = 1968;} > let date x = DateTime.Parse(x);; val date : string -> DateTime > printfn "date = %A" (date "13 July 1968");; date = 13/07/1968 00:00:00 val it : unit = ()
CHAPTER 10 US IN G THE F# A ND .NE T LIBRARIES
> printfn "birth = %A" (date "18 March 2003, 6:21:01pm");; birth = 18/03/2003 18:21:01 val it : unit = () Note that formatting dates depends on the user s localization settings; you can achieve more explicit formatting by using the System.DateTime.ToString overload that accepts explicit format information. Here we use System.Uri type to parse a URL: > open System;; > System.Uri.TryCreate("http://www.thebritishmuseum.ac.uk/", UriKind.Absolute);; val it : bool * System.Uri = (true, http://www.thebritishmuseum.ac.uk/ { AbsolutePath = "/"; ... DnsSafeHost = "www.thebritishmuseum.ac.uk"; ... Port = 80; ... Scheme = "http"; }) > Uri.TryCreate("e3 %//ww.gibberish.com", UriKind.Absolute);; val it : bool * Uri = (false, null) Many .NET types are used to hold static functions such as those for converting data from one format to another. Types such as System.Random play a similar role via objects with a small amount of state. Table 10-5 shows some of the most useful of these types.
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