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fetch pages synchronously. This is useful for many purposes, but browsers and high-performance web crawlers will have tens or thousands of connections in flight at once. The type Microsoft.FSharp.Control.Async<'a> lies at the heart of F# asynchronous workflows. A value of type Async<'a> represents a program fragment that will generate a value of type 'a at some point in the future. Listing 13-5 shows how to use asynchronous workflows to fetch several web pages simultaneously. Listing 13-5. Fetching Three Web Pages Simultaneously open System.Net open System.IO open Microsoft.FSharp.Control.CommonExtensions let museums = ["MOMA", "http://moma.org/"; "British Museum", "http://www.thebritishmuseum.ac.uk/"; "Prado", "http://museoprado.mcu.es"] let fetchAsync(nm,url:string) = async { do printfn "Creating request for %s..." nm let req = WebRequest.Create(url) let! resp = req.GetResponseAsync()

There are two overloads for each method that returns column data, one that takes an ordinal column position, and the other that takes the string name of the property. This second overload is a convenience, but makes the code in a business object much more readable. All the methods that return column data are null protected with code like this: public string GetString(string name) { return GetString(_dataReader.GetOrdinal(name)); } public virtual string GetString(int i) { if( _dataReader.IsDBNull(i)) return string.Empty; else return _dataReader.GetString(i); } If the value in the database is null, the method returns some more palatable value typically, whatever passes for empty for the specific data type. If the value isn t null, it simply returns the value from the underlying data reader object. For string values, the empty value is string.Empty; for numeric types, it is 0; and for Boolean types, it is false. You can look at the full code for SafeDataReader to see all the translations. Notice that the GetString() method that actually does the translation of values is marked as virtual. This allows you to override the behavior of any of these methods by creating a subclass of SafeDataReader. The GetOrdinal() method translates the column name into an ordinal (numeric) value, which can be used to actually retrieve the value from the underlying IDataReader object. GetOrdinal() looks like this: public int GetOrdinal(string name) { return _dataReader.GetOrdinal(name); } Every data type supported by IDataReader (and there are a lot of them) has a pair of methods that reads the data from the underling IDataReader object, replacing null values with empty default values as appropriate.

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Add the resetFields function to your global.js file. You need to activate the function by passing it a Form object. Write another function called prepareForms that loops through each Form object in the document and passes each one to the resetFields function. function prepareForms() { for (var i=0; i<document.forms.length; i++) { var thisform = document.forms[i]; resetFields(thisform); } } } Call the prepareForms function using addLoadEvent:

do printfn "Getting response stream for %s..." nm let stream = resp.GetResponseStream() do printfn "Reading response for %s..." nm let reader = new StreamReader(stream) let! html = reader.ReadToEndAsync() do printfn "Read %d characters for %s..." html.Length nm } for nm,url in museums do Async.Spawn (fetchAsync(nm,url)) The types of these functions and values are as follows: val museums : (string * string) list val fetchAsync : string * string -> Async<unit> When run on one of our machines via F# Interactive, the output of the code from Listing 13-5 is as follows: Creating request Creating request Creating request Getting response Reading response for for for for for MOMA... British Museum... Prado... MOMA... MOMA...

Most types have empty values that are obvious, but DateTime is problematic as it has no empty value: public DateTime GetDateTime(string name) { return GetDateTime(_dataReader.GetOrdinal(name)); } public virtual DateTime GetDateTime(int i) { if (_dataReader.IsDBNull(i)) return DateTime.MinValue; else return _dataReader.GetDateTime(i); } The minimum date value is arbitrarily used as the empty value. This isn t perfect, but it does avoid returning a null value or throwing an exception. A better solution may be to use the SmartDate type instead of DateTime. To simplify retrieval of a date value from the database into a SmartDate, SafeDataReader implements two variations of a GetSmartDate() method: public Csla.SmartDate GetSmartDate(string name) { return GetSmartDate(_dataReader.GetOrdinal(name), true); } public virtual Csla.SmartDate GetSmartDate(int i) { return GetSmartDate(i, true); } public Csla.SmartDate GetSmartDate(string name, bool minIsEmpty) { return GetSmartDate(_dataReader.GetOrdinal(name), minIsEmpty); } public virtual Csla.SmartDate GetSmartDate( int i, bool minIsEmpty) { if (_dataReader.IsDBNull(i)) return new Csla.SmartDate(minIsEmpty); else return new Csla.SmartDate( _dataReader.GetDateTime(i), minIsEmpty); } Data access code in a business object can choose either to accept the minimum date value as being equivalent to empty or to retrieve a SmartDate that understands the concept of an empty date: SmartDate myDate = dr.GetSmartDate(0); or SmartDate myDate = dr.GetSmartDate(0, false);

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