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> open System.IO;; > [@"C:\Program Files"; @"C:\Windows"] |> List.map Directory.GetDirectories;; val it : string [] list = [ [|"C:\\Program Files\\Adobe"; "C:\\Program Files\\Apoint"; "C:\\Program Files\\CA"; "C:\\Program Files\\CE Remote Tools"; ...]; ... ] Sometimes you will need to add extra type information to indicate which overload of the method is required. We discuss method overloading in more detail in 6. For example, the following causes an error: > open System;; > let f = Console.WriteLine;; C:\misc\test.ml(11,8): error: FS0041: The method WriteLine is overloaded. Possible matches are shown below. Resolve the overloading by adding further type annotations to the arguments. Possible overload: 'Console.WriteLine(bool value) : unit'. Possible overload: 'Console.WriteLine(char value) : unit'. ... However, the following succeeds: > let f = (Console.WriteLine : string -> unit);; val f : string -> unit

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query. For example, even if a row has been deleted from the database, if it existed in the result set originally, its value would be retained within the cached result set. This reduces the utility of the refreshRow() operation.

Figure 4-12. Process and code for establishing a callback (continued) Let s start by adding the client-side pieces of functionality. First you ll need to alter the onChange event of the second list to call a helper method instead of just popping its value in a message box: <select id=ddlListB onchange='GetAddress();'></select> The GetAddress method will be dynamically generated from your code-behind. This is generated by a call to GetCallbackEventReference, and the behavior of the callback is determined entirely by the parameters that are passed to this method (see Table 4-4). Table 4-4. Arguments of the GetCallbackEventReference Method

One important tool in F# programming is pattern matching, a general construct that combines decomposition and control. In the previous sections, you got a taste of how you can use pattern matching with tuple, list, and option values. However, you can also use pattern matching in many other situations. You ll see many other examples of pattern matching in this book, but let s start with some simple pattern matching over strings and integers. As you ve already seen, pattern matches on explicit values are introduced using the match ... with ... construct: let urlFilter url agent = match (url,agent) with | "http://www.control.org", 99 -> true | "http://www.kaos.org" , _ -> false | _, 86 -> true | _ -> false

First, we repopulate table t1 with numbers from 1 to 30 as we did in the beginning of the section Example of Updatability. The following DemoRefreshRow program invokes the method _demoRefreshRow() in the main() method to illustrate the concept of refetching rows. Note that the query is ordered by column x, so we expect row number 1 to have a value of 1, row number 2 to have a value of 2, and so on. /* This program demonstrates refetching of rows in a result set. * COMPATIBLITY NOTE: runs successfully against 10.1.0.2.0 and 9.2.0.1.0. */ import java.io.IOException; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.PreparedStatement; import java.sql.Connection; import book.util.JDBCUtil; import book.util.Benchmark; import book.util.InputUtil; class DemoRefreshRow { public static void main(String args[]) throws Exception, IOException { Connection conn = null; try { conn = JDBCUtil.getConnection("scott", "tiger", "ora10g"); _demoRefreshRow( conn, "select x from t1 order by x" ); } catch (SQLException e) { // handle the exception properly - in this case, we just // print the stack trace. JDBCUtil.printException ( e ); } finally { // release the JDBC resources in the finally clause. JDBCUtil.close( conn ); } } // end of main()

System.Text.Encoding UTF8 : Encoding ASCII : Encoding Unicode : Encoding UTF32 : Encoding GetEncoding : string -> Encoding member GetBytes : string -> byte[] member GetChars: byte[] -> char[] member GetString : byte[] -> string

The control that implements ICallbackEventHandler. This interface defines a single method that will be invoked when the callback occurs. It accepts a string as a parameter. This is the only information that can be passed from the client to the server. You can implement this interface at the Page level, or a user control or custom control can implement and accept the callback event.