c# data matrix reader

c# data matrix reader

c# data matrix reader

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< xml version="1.0" encoding="UTF-8" standalone="yes" > <points> <point> <x>1</x> <y>2</y> </point> <point> <x>3</x> <y>4</y> </point> <point> <x>5</x> <y>6</y> </point> </points>

class Program { static void Main() { MyClass mc = new MyClass(); Use the class object. foreach (string shade in mc) Console.Write("{0} ", shade); Use the class iterator method. foreach (string shade in mc.BlackAndWhite()) Console.Write("{0} ", shade); } } This code produces the following output:

Listing 6-16 shows a demonstration of the Cursor API. There is no Cursor class for the Streaming API for XML it is just called that for its manner of going through the XML file. The class basically gets an XMLStreamReader from the XMLInputFactory and then starts looping through the stream. For each event the system runs across, the cursor stops for processing. You can check the event type against one of the XMLEvent interface constants, or rely on methods like isStartElement() or isCharacters() of the same interface to test for event type. By working with the integer constants, you can create a switch statement like the one in Listing 6-16 for handling different element types.

The previous two sections showed that you can create an iterator to return either an enumerable or an enumerator. Figure 20-9 summarizes how to use the common iterator patterns. When you implement an iterator that returns an enumerator, you must make the class enumerable by implementing GetEnumerator, so that it returns the enumerator returned by the iterator. This is shown on the left of the figure. In a class, when you implement an iterator that returns an enumerable, you can either make this class itself enumerable or not by either making it implement GetEnumerator or not. If you implement GetEnumerator, make it call the iterator method to get an instance of the automatically generated class that implements IEnumerable. Next, return the enumerator built by GetEnumerator from this IEnumerable object, as shown on the right of the figure. If you don t make the class itself enumerable by not implementing GetEnumerator, you can still use the enumerable returned by the iterator, by calling the iterator method directly, as shown in the second foreach statement on the right.

It s fundamentally important to see that a data-oriented chronological description does not leave out any information. It s all there; it s just from a different point of view.

The previous examples used iterators that returned either an IEnumerator<T> or an IEnumerable<T>. You can also create iterators that return the non-generic versions as well. The return types you can specify are the following: IEnumerator<T> (generic substitute an actual type for T) IEnumerable<T> (generic substitute an actual type for T) IEnumerator (non-generic) IEnumerable (non-generic) For the two enumerator types, the compiler generates a nested class that contains the implementation of either the non-generic or the generic enumerator, with the behavior specified by the iterator block. For the two enumerable types, it does even more. It produces a nested class that is both enumerable and the enumerator. The class, therefore, implements both the enumerator and the GetEnumerator method. Notice that GetEnumerator is implemented as part of the nested class not as part of the enclosing class. Figure 20-10 illustrates the generic enumerable produced by the enumerable iterator in the last example. The iterator s code is shown on the left side of the figure, and shows that its return type is IEnumerable<string>. On the right side of the figure, the diagram shows that the nested class implements both IEnumerator<string> and IEnumerable<string>.

CHAPTER 6 EXTENSIBLE MARKUP LANGUAGE (XML)

Figure 20-10. The compiler produces a class that is both an enumerable and an enumerator. It also produces the method that returns the class object.