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In all kinds of software, it is common to hide implementation details of data structures and algorithms behind encapsulation boundaries. Encapsulation is a fundamental technique when writing software and is possibly the most important idea associated with OO programming. For our purposes, encapsulation simply means hiding implementation details behind well-defined boundaries. This lets you enforce consistency properties and makes the structure of a program easier to manage. It also lets an implementation evolve over time. A good rule of thumb is that anything you don t want used directly by client code should be hidden. Later in this chapter, we explain how encapsulation applies when building assemblies, frameworks, and applications. In the extreme, you may even be ensuring that your code is secure when used in partial trust mode, in other words, that it can t be inadvertently or deliberately used to achieve malicious results when used as a library by code that doesn t have full permissions. However, the most important kind of encapsulation is the day-to-day business of hiding the internal implementation details of functions, objects, types, and modules. The primary techniques used to do this are as follows: Local definitions Accessibility annotations Explicit signatures We cover the first two of these techniques next, and we cover explicit signatures in the Using Signature Types and Files section later in this chapter. add watermark text to pdf using itextsharp c# Create a WaterMark in PDF files in C# - Code - MSDN - Microsoft
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Here is some example for applying watermark in pdf. ... com/post/2011/12/21/Using-iTextSharp-with-aspnet-to-add-watermark-in-pdf-file.aspx[^] We define a global array first of all, to hold all our garments. (Yes, global variables are evil. In production, we d use a namespacing object, but we ve omitted that for clarity here.) This is an associative array, keyed by the garment s unique ID, ensuring that we have only one reference to each garment type at a time. In the constructor function, we set all the simple properties, that is, those that aren t arrays. We define the arrays as empty and provide simple adder methods, which uses our enhanced array code (see appendix B) to prevent duplicates. We don t provide getter or setter methods by default and don t support the full access control private, protected, and public variables and methods that a full OO language does. There are ways of providing this feature, which are discussed in appendix B, but my own preference is to keep the Model simple. When parsing the XML stream, it would be nice to initially build an empty Garment object and then populate it field by field. The astute reader may be wondering why we haven t provided a simpler constructor. In fact, we have. JavaScript function arguments are mutable, and any missing values from a call to a function will simply initialize that value to null. So the call word ean 13 barcode font, data matrix word 2010, microsoft word barcode font code 128, free upc barcode font for word, birt barcode maximo, birt pdf 417 c# add watermark to existing pdf file using itextsharp Watermark pdf in C# - asp.net tips and tricks
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You have to use itextsharp .dll for in .. Here is some example for applying watermark in pdf . Hide Copy Code. iTextSharp .text. Image img ... The easiest way to hide definitions is to make them local to expressions or constructed class definitions using inner let bindings. These are not directly accessible from outside their scope. This technique is frequently used to hide state and other computed values inside the implementations of functions and objects. We begin with a simple example. Here is the definition of a function that incorporates a single item of encapsulated state: let generateTicket = let count = ref 0 (fun () -> incr count; !count) If you examine this definition, you ll see that the generateTicket function is not defined immediately as a function but instead first declares a local element of state called count and then returns a function value that refers to this state. Each time the function value is called, count is incremented and dereferenced, but the reference cell itself is never published outside the function implementation and is thus encapsulated. Encapsulation through local definitions is a particularly powerful technique in F# when used in conjunction with object expressions. For example, Listing 7-1 shows the definition of an object interface type called IPeekPoke and a function that implements objects of this type using an object expression. The highest data value for the data values in cells B2 through B16 is displayed in cell H2 13 Click cell I2, type =MIN(B2:B16), and press the Enter key The lowest data value for the data values in cells B2 through B16 is displayed in cell I2 14 Click cell J2, type =IF(AVERAGE(B2:B16)>1000, Average > 1000 , Average < 1000 ), and press the Enter key The text Average > 1000 is displayed in cell J2 because the average of the data values in cells B2 through B16 is greater than 1,000.. var garment=new Garment(123,null,null,null); Listing 7-1. Implementing Objects with Encapsulated State type IPeekPoke = abstract member Peek: unit -> int abstract member Poke: int -> unit let Counter(initialState) = let state = ref initialState { new IPeekPoke with member x.Poke(n) = state := !state + n member x.Peek() = !state } The type of the function Counter is as follows: We need to pass in the ID, because we use that in the constructor to place the new object in the global list of garments. We could parse the XML feed of the type shown in listing 4.10 in order to generate Garment objects in the client application. We ve already seen this in action in chapter 2, and we ll see a number of variations in chapter 5, so we won t go into all the details here. The XML document contains a mixture of attributes and tag content. We read attribute data using the attributes property and getNamedItem() function and read the body text of tags using the firstChild and data properties, for example: add image watermark to pdf c# Add Text Watermark and Image Watermark to PDF in C# .NET ...
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