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Consider a stateful account class that represents a single customer account. Information is read from the database when it s first created in the constructor method, and this information can be updated using the Update() method. Public Class CustomerAccount Private _accountNumber As Integer Private _balance As Decimal Public Property Balance() As Decimal Get Return _balance End Get Set(ByVal value As Decimal) _balance = value End Set End Property Public Sub New(ByVal accountNumber As Integer) ' (Code to read account record from database goes here.) End Sub Public Sub Update() ' (Code to update database record goes here.) End Sub End Class

In this example, the iterator object (named matches) is defined with the var keyword. This is a shortcut that tells the C# compiler to use the correct data type, without forcing you to specify it. Technically, the iterator object could be one of several different types of objects depending on the clauses you use in the LINQ expression. But all of these objects implement the strongly typed version of the

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If you have two CustomerAccount objects that expose a Balance property, you need to perform two separate steps to transfer money from one account to another. Conceptually, the process works like this: ' Create an account object for each account, ' using the account number. Dim accountOne As New CustomerAccount(122415) Dim accountTwo As New CustomerAccount(123447) Dim amount As Decimal = 1000 ' Withdraw money from one account. accountOne.Balance -= amount ' Deposit money in the other account. accountTwo.Balance += amount ' Update the underlying database records using the Update() method. accountOne.Update() accountTwo.Update() The problem here is that if this task is interrupted halfway through by an error, you ll end up with at least one unhappy customer.

IEnumerable interface. In this example, that means you can replace the var keyword with IEnumerable<Employee>, because the collection holds Employee objects, if you don t mind the additional complexity. However, either way the compiled code is exactly the same. If you use the var keyword, the compiler adds the data type information to your compiled page automatically (although you never see this detail).

A stateless object might expose only a shared method named FundTransfer(), which performs all its work in one method: Public Class AccountUtility Public Shared Sub FundTransfer(ByVal accountOne As Integer, _ ByVal accountTwo As Integer, ByVal amount As Decimal) ' (The code here retrieves the two database records, ' changes them, and updates them.) End Sub End Class The calling code can t use the same elegant CustomerAccount objects, but it can be assured that account transfers are protected from error. Because all the database operations are performed at once, they can use a database stored procedure for greater performance and can use a transaction to ensure that the withdrawal and deposit either succeed or fail as a whole. ' Set the account and transfer details. Dim amount As Decimal = 1000 Dim accountIDOne As Integer = 122415 Dim accountIDTwo As Integer = 123447 AccountUtility.FundTransfer(accountIDOne, accountIDTwo, _ amount)

Tip You don t need to know the specific iterator class that your code uses because you interact with the results

iterator_apply(iterator, callback, [user data]): This function is used to apply a function to every element of an iterator, in the same way array_walk() is used on arrays. Listing 9-2 shows a simple iterator_apply() application. Listing 9-2. Using iterator_apply function print_entry($iterator) { print( $iterator->current() ); return true; } $array = array(1,2,3); $iterator = new ArrayIterator($array); iterator_apply($iterator, 'print_entry', array($iterator)); This code outputs the following:

In a mission-critical system, transactions are often required. For that reason, classes that retain little state information are often the best design approach, even though they aren t quite as satisfying from an object-oriented perspective.

through the strongly typed IEnumerable interface. But if you re curious, you can determine the object type at runtime using the Visual Studio debugger (just hover over the variable while in break mode).

Tip There is one potential compromise. You can create stateful classes to represent common items such as accounts, customers, and so on, without adding any functionality. Then, you can use these classes as data packages to send information to and from a stateless utility class. (These are the data objects that were described in the beginning of this chapter.)

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