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We owe the Open/Closed Principle (OCP) to Bertrand Meyer. The principle addresses the need of creating software entities (whether classes, modules, or functions) that can happily survive changes. The purpose of the principle is to provide guidance on how to write components that can be extended without actually touching the source code. Sounds like quite an ambitious plan, doesn t it Let s get at the formulation: A class should be open for extension but closed for modification. Honestly, I find the formulation a bit idealistic and bordering on magic. However, the principle is in itself quite concrete. It essentially says that the source code of the class must remain intact, but the compiled code must be able to work with types it doesn t know directly. This can be achieved in just one way: abstracting aspects of the class that can lead to changes over time. To abstract these aspects, you can either use interfaces and code injection or generics. pdfsharp replace text c# VS 2010 [RESOLVED] " replace " Words in PDF file using iTextSharp ...
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asp.net pdf editor control 29 Jul 2018 ... In order to replace text in all the pages of a PDF document, you first need to use TextFragmentAbsorber to find the particular phrase you want to ... c# mvc website pdf file in stored in byte array display in browser Low coupling between interfacing modules is beneficial because it instructs the caller to work with an abstraction of its counterpart rather than with a concrete implementation. In their masterpiece Design Patterns: Elements of Reusable Object-Oriented Software (AddisonWesley, 1994), the Gang of Four (Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides) formulate a basic principle of object-oriented design as Program to an interface, not to an implementation. The gist of OCP is all here. Code that is based on an abstraction can work with a concrete object it gets passed as long as this object is compatible with known abstraction. Behind the term abstraction, you can find at least two concrete syntax elements: a base class or an interface. Here s the canonical example of a class the Renderer class that fully complies with OCP: PRINT "MEGACAR COMPUTER NETWORK " public abstract class Shape { public abstract void Render(); } public class Renderer { public void Draw(IList<Shape> shapes) { foreach(Shape s in shapes) s.Render(); } } replace text in pdf c# iTextSharp Replace Text in existing PDF without loosing formation ...
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We love the text searching, but need to determine whether or not there is a way for us to replace text . Currently it does not seem as though this ... The abstraction is represented by the base class Shape. The Renderer class is closed for modification but still open for extension because it can deal with any class that exposes the Shape abstraction for example, any class that derives from Shape. Analogously, you can have a Renderer<T> class that receives its working type as a generic argument. OCP should not be taken literally. Like SRP, it works much better if used as a driving vector. Frankly, no significant class can be 100 percent closed for modification. By significant class here, I mean most real-world classes or, better, all classes except those you write just for demo purposes! If closure of a given class can t realistically be complete, it should then be strategic. It is a precise architect s responsibility to identify the most likely changes in the class body and close the class design against them. In other words, designing a class that can support all possible future extensions is a utopian pursuit. However, identifying just one specific abstraction or two and making the class work against them is, most of the time, an excellent compromise. Aiming for fully pluggable classes is over designing; even a partial application of OCP is beneficial and rewarding. If you ignore OCP, at some point you might catch yourself downcasting to a specific subclass to compile the code and avoid run-time exceptions. If this happens, it s a clear sign that something is wrong in the design. Of the five SOLID principles, Liskov s principle is probably the only one that should be taken literally, because it serves you a detailed list of dos and don ts and it isn t limit to being a generic guidance on design. The formulation of the principle couldn t be simpler. To some extent, it also seems a bit obvious: Subclasses should always be substitutable for their base classes. When a new class is derived from an existing one, it should always be possible to use the derived class in any place where the parent class is accepted. Wait a moment! Isn t this something you get out of the box with any object-oriented language Well, not exactly! What you really get from OOP is just the mere promise that derived classes can be used wherever their base class is accepted. However, OOP still lets you write hierarchies of classes where this basic requirement isn t met; hence, the principle. 5 TheBank ARoundButton This simple application demonstrates the basics of class inheritance. This small project shows how easy it is to derive from a Windows Forms control and redefine its drawing. replace text in pdf using itextsharp in c# How to replace specific word in pdf using itextsharp C# .net ...
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