how to generate qr code in asp.net using c# It has simple properties for its Text, the DocumentDate, and the Author, and no other methods. in Visual C#

Make QR-Code in Visual C# It has simple properties for its Text, the DocumentDate, and the Author, and no other methods.

It has simple properties for its Text, the DocumentDate, and the Author, and no other methods.
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What Is Coupling
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Two classes are said to be coupled if a change to one requires a change to another. We saw examples of that in the previous chapter. When we created our NamedPerson class, it required changes to the FirefighterBase and the Administrator classes. We therefore say that FirefighterBase and Administrator are coupled to NamedPerson. Of course, any class or function that refers to another class or function is coupled to that class that s unavoidable (indeed, desirable). But to make testing simpler and systems more reliable, we try to ensure that we minimize the number of other types to which any class or function is coupled, and that we minimize the number of couplings between any two types. That way, any given change to a class will have a minimal number of knock-on effects elsewhere in the system. We also try to ensure that we organize classes into conceptual groupings called layers so that more tightly coupled classes live together in one layer, and that there are a minimal number of well-controlled couplings between layers. As part of that layered approach, it is usual to try to ensure that most couplings go one-way; classes of a lower layer should not depend on classes in a layer above. That way, we can further limit (and understand) the way changes propagate through the system. The layers act like firewalls, blocking the further impact of a change. As usual with software design, these disciplines are not hard-and-fast rules, and they are not imposed by the platform or language; but they are common practices that the platform and language are designed to support.
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Now we want to be able to process the document. At the very least, we want to be able to Spellcheck, Repaginate, or Translate it (into French, say). Because we can t change the Document class, we ll implement these methods in a static utility class of common processes, as we learned in 3. Example 5-2 shows this class, although the implementations are obviously just placeholders we re illustrating how to structure the code here, and trying to write a real spellchecker would be a rather large distraction.
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static class DocumentProcesses { public static void Spellcheck( Document doc ) { Console.WriteLine("Spellchecked document."); } public static void Repaginate( Document doc) { Console.WriteLine("Repaginated document."); } public static void TranslateIntoFrench( Document doc ) { Console.WriteLine("Document traduit."); } } // ...
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Now we can build a simple example of a document processor that translates, spellchecks, and then repaginates the document (see Example 5-3).
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static class DocumentProcessor { public static void Process(Document doc) { DocumentProcesses.TranslateIntoFrench(doc); DocumentProcesses.Spellcheck(doc); DocumentProcesses.Repaginate(doc); } }
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And we can call on it from our main function, to process a couple of documents, as shown in Example 5-4.
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class Program { static void Main(string[] args) { Document doc1 = new Document { Author = "Matthew Adams", DocumentDate = new DateTime(2000, 01, 01), Text = "Am I a year early " }; Document doc2 = new Document { Author = "Ian Griffiths",
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};
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DocumentDate = new DateTime(2001, 01, 01), Text = "This is the new millennium, I promise you."
Console.WriteLine("Processing document 1"); DocumentProcessor.Process(doc1); Console.WriteLine(); Console.WriteLine("Processing document 2"); DocumentProcessor.Process(doc2); } Console.ReadKey();
}
Compile and run that, and you ll see the following output:
Processing document 1 Document traduit. Spellchecked document. Repaginated document. Processing document 2 Document traduit. Spellchecked document. Repaginated document.
We encapsulated a particular set of processing instructions, executed in a particular order, in this (static) DocumentProcessor class so that we can easily reuse it with different client applications that want a standard, reliable means of performing our translate into French process. So far, this should all be pretty familiar. But what about a different set of processing operations, one that leaves the document in its native language and just spellchecks and repaginates We could just create a second DocumentProcessor-like class, and encapsulate the relevant method calls in a process function:
static class DocumentProcessorStandard { public static void Process(Document doc) { DocumentProcesses.Spellcheck(doc); DocumentProcesses.Repaginate(doc); } }
And then we could add some calls to that processor in our Main method:
Console.WriteLine(); Console.WriteLine("Processing document 1 (standard)"); DocumentProcessorStandard.Process(doc1); Console.WriteLine(); Console.WriteLine("Processing document 2 (standard)"); DocumentProcessorStandard.Process(doc2);
Nothing is intrinsically wrong with any of this; it clearly works, and we have a nice enough design that neatly encapsulates our processing. We note that each DocumentProcessor is coupled to the Document class, and also to each method that it calls on the DocumentProcesses class. Our client is coupled to the Document and each DocumentProcessor class that it uses. If we go back to the specification we showed earlier, we see that we are likely to be creating a lot of different functions to modify the document as part of the production process; they ll slip in and out of use depending on the type of document, other systems we might have to work with, and the business process of the day. Rather than hardcoding this process in an ever-increasing number of processor classes (and coupling those to an ever-increasing number of DocumentProcesses), it would obviously be better if we could devolve this to the developers on our production team. They could provide an ordered set of processes (of some kind) to the one and only DocumentProcessor class that actually runs those processes. We can then focus on making the process-execution engine as efficient and reliable as possible, and the production team will be able to create sequences of processes (built by either us, them, contractors, or whoever), without having to come back to us for updates all the time. Figure 5-1 represents that requirement as a diagram.
The document is submitted to the document processor, which runs it through an ordered sequence of processes. The same document comes out at the other end.
OK, let s build a DocumentProcessor class that implements that (see Example 5-5).
class DocumentProcessor { private readonly List<DocumentProcess> processes = new List<DocumentProcess>(); public List<DocumentProcess> Processes { get { return processes; } } public void Process(Document doc) { foreach(DocumentProcess process in Processes) { process.Process(doc); } }
}
Our document processor has a List of DocumentProcess objects (a hypothetical type we ve not written yet). A List<T> is an ordered collection that is to say that the item you Add at index 0 stays at index 0, and is first out of the block when you iterate the list, and so on. That means our Process method can just iterate over the collection of DocumentProcess objects, and call some equally hypothetical Process method on each to do the processing. But what type of thing is a DocumentProcess Well, we already saw a solution we can use we could create a DocumentProcess abstract base, with a Process abstract method:
abstract class DocumentProcess { public abstract void Process(Document doc); }
We then need to create a derived class for every processing operation, as shown in Example 5-6.
class SpellcheckProcess : DocumentProcess { public override void Process(Document doc) { DocumentProcesses.Spellcheck(doc); } }
class RepaginateProcess : DocumentProcess { public override void Process(Document doc) { DocumentProcesses.Repaginate(doc); } } class TranslateIntoFrenchProcess : DocumentProcess { public override void Process(Document doc) { DocumentProcesses.TranslateIntoFrench(doc); } }
Now we can configure a processor in our client by adding some process objects to the list (see Example 5-7).
static DocumentProcessor { DocumentProcessor rc rc.Processes.Add(new rc.Processes.Add(new rc.Processes.Add(new return rc; } Configure() = new DocumentProcessor(); TranslateIntoFrenchProcess()); SpellcheckProcess()); RepaginateProcess());
See how we are adding the processes to the processor in the same order we had in our function calls previously Our process objects are logically similar to function calls, and the order in which they appear is logically similar to a program, except that they are composed at runtime rather than compile time. We can then use this configuration method in our client, and call on the processor to process our documents, as shown in Example 5-8.
static void Main(string[] args) { Document doc1 = new Document { Author = "Matthew Adams", DocumentDate = new DateTime(2000, 01, 01), Text = "Am I a year early " }; Document doc2 = new Document { Author = "Ian Griffiths", DocumentDate = new DateTime(2001, 01, 01), Text = "This is the new millennium, I promise you." };
DocumentProcessor processor = Configure(); Console.WriteLine("Processing document 1"); processor.Process(doc1); Console.WriteLine(); Console.WriteLine("Processing document 2"); processor.Process(doc2); } Console.ReadKey();
If you compile and run, you ll see the same output as before:
Processing document 1 Document traduit. Spellchecked document. Repaginated document. Processing document 2 Document traduit. Spellchecked document. Repaginated document.
This is a very common pattern in object-oriented design encapsulating a method in an object and/or a process in a sequence of objects. What s nice about it is that our DocumentProcessor is now coupled only to the Document class, plus the abstract base it uses as a contract for the individual processes. It is no longer coupled to each and every one of those processes; they can vary without requiring any changes to the processor itself, because they implement the contract demanded by the abstract base class. Finally, the processing sequence (the program for the DocumentProcessor) is now the responsibility of the client app, not the processor library; so our different production teams can develop their own particular sequences (and, indeed, new processes) without having to refer back to the core team and change the document processor in any way. In fact, the only thing that is a bit of a pain about this whole approach is that we have to declare a new class every time we want to wrap up a simple method call. Wouldn t it be easier just to be able to refer to the method call directly C# provides us with a tool to do just that: the delegate.
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