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Why does this work, apparently magically, with arrays The reason is that an array can produce, upon request, an object called an enumerator. The enumerator is an object that can return the elements of the array, one by one, in order, as they are requested. The enumerator knows the order of the items and keeps track of where it is in the sequence. It then returns the current item when it is requested. For types that have enumerators, there must be a way of retrieving them. The standard way of retrieving an object s enumerator in .NET is to call the object s GetEnumerator method. Types that implement a GetEnumerator method are called enumerable types, or just enumerables. Arrays are enumerables. Figure 20-1 illustrates the relationship between enumerables and enumerators.

Figure 20-1. Overview of enumerators and enumerables The foreach construct is designed to work with enumerables. As long as the object it is given to iterate over is an enumerable type, such as an array, it will perform the following actions: Get the object s enumerator by calling its GetEnumerator method Request each item from the enumerator and make it available to your code as the iteration variable, which your code can read (but not change).

We will assume a modest CRM warehouse containing data on 14 million prospects and past customers and 6 million current customers. Let us assume that we can build it for $10 million, including the software

Must be enumerable foreach( Type VarName in EnumerableObject ) { ... }

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There are three variations on enumerators. They all work essentially the same way, with only slight differences. I'll discuss all three types. You can implement enumerators using the following: The IEnumerator/IEnumerable interfaces called the nongeneric interface form The IEnumerator<T>/IEnumerable<T> interfaces called the generic interface form The form that uses no interfaces

BackToFront, first the Active or Ending menu at depth 1 will be drawn Next, if applicable, the Starting menu will be drawn (blending over the image already there) and finally all text renderings In the Draw method of your MenuWindow class, keep track of these two variables: float bgLayerDepth; Color bgColor; These will contain the layerDepth and transparency value for the background image, which are set in the switch structure: switch (windowState) { case WindowStateStarting: horPosition -= 200 * (10f - (float)smoothedProgress); alphaValue = smoothedProgress; bgLayerDepth = 05f; bgColor = new Color(new Vector4(1, 1, 1, alphaValue)); break; case WindowStateEnding: horPosition += 200 * (float)smoothedProgress; alphaValue = 10f - smoothedProgress; bgLayerDepth = 1; bgColor = ColorWhite; break; default: alphaValue = 1; bgLayerDepth = 1; bgColor = ColorWhite; break; } where Color.

for access, with annual maintenance costs of $1.5 million, which include the costs for the staff, NCOA (National Change of Address), and appended external data. Amortized over 3 years, the warehouse will cost us $5.5 million per year, as shown in Table 2-1. Let s compare this to the cost of database marketing in the same situation, shown in Table 2-2. It costs far less. We are assuming a cost of $1.5 million to build the database. Many databases are built for far less, such as $500,000, and some, of course, cost more. The number $1.5 million is a good number for a large corporate marketing database.

This section will start by looking at the first in the preceding list: the nongeneric interface form. This form of enumerator is a class that implements the IEnumerator interface. It's called nongeneric because it does not use C# generics. The IEnumerator interface contains three function members: Current, MoveNext, and Reset. Current is a property that returns the item at the current position in the sequence. It is a read-only property. It returns a reference of type object, so an object of any type can be returned.

MoveNext is a method that advances the enumerator s position to the next item in the collection. It also returns a Boolean value, indicating whether the new position is a valid position or is beyond the end of the sequence. If the new position is valid, the method returns true. If the new position isn't valid (that is, it s beyond the end), the method returns false. The initial position of the enumerator is before the first item in the sequence. MoveNext must be called before the first access of Current.

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