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public void ClearPeople() { arPeople.Clear(); } public int Count { get { return arPeople.Count; } } // Foreach enumeration support. IEnumerator IEnumerable.GetEnumerator() { return arPeople.GetEnumerator(); } } With these types defined, you are now assured of type safety, given that the C# compiler will be able to determine any attempt to insert an incompatible type: static void Main(string[] args) { Console.WriteLine("***** Custom Person Collection *****\n"); PeopleCollection myPeople = new PeopleCollection(); myPeople.AddPerson(new Person("Homer", "Simpson", 40)); myPeople.AddPerson(new Person("Marge", "Simpson", 38)); myPeople.AddPerson(new Person("Lisa", "Simpson", 9)); myPeople.AddPerson(new Person("Bart", "Simpson", 7)); myPeople.AddPerson(new Person("Maggie", "Simpson", 2)); // This would be a compile-time error! myPeople.AddPerson(new Car()); foreach (Person p in myPeople) Console.WriteLine(p); Console.ReadLine(); } While custom collections do ensure type safety, this approach leaves you in a position where you must create a (almost identical) custom collection for each type you wish to contain. Thus, if you need a custom collection that will be able to operate only on classes deriving form the Car base class, you need to build a very similar type: public class CarCollection : IEnumerable { private ArrayList arCars = new ArrayList(); public CarCollection(){} // Cast for caller. public Car GetCar(int pos) { return (Car) arCars[pos]; } // Only insert Car types. public void AddCar(Car c) { arCars.Add(c); } public void ClearCars() { arCars.Clear(); } public int Count { get { return arCars.Count; } } // Foreach enumeration support. IEnumerator IEnumerable.GetEnumerator() { return arCars.GetEnumerator(); } }

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c# - Create PDF preview - Code Review Stack Exchange
May 5, 2017 · It open a PDF file, create a thumbnail (using PdfDocument class) and returns ... lock(pdfDocumentMutex) { using (Image image = pdfDocument.

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As you may know from firsthand experience, the process of creating multiple strongly typed collections to account for various types is not only labor intensive, but also a nightmare to maintain. Generic collections allow us to delay the specification of the contained type until the time of creation. Don t fret about the syntactic details just yet, however. Consider the following code, which makes use of a generic class named System.Collections.Generic.List<> to create two type-safe container objects: static void Main(string[] args) { // Use the generic List type to hold only people. List<Person> morePeople = new List<Person>(); morePeople.Add(new Person()); // Use the generic List type to hold only cars. List<Car> moreCars = new List<Car>(); // Compile-time error! moreCars.Add(new Person()); }

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Matthew Ephraim released an open source wrapper for Ghostscript that sounds like it does what you want and is in C# . Link to Source Code: ...

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Polymorphism provides a way for a subclass to customize how it implements a method defined by its base class. To retrofit your current design, you need to understand the meaning of the C# virtual and override keywords. If a base class wishes to define a method that may be overridden by a subclass, it must specify the method as virtual:

In 10, you will see how to use the Spring IoC container to inject all of your beans and let them be managed by the container. Using Spring, you can inject the UserDao to the container and then refer its instance to UserServiceImpl or other beans. Listings 9-16 and 9-17 show the code for the interface and its implementation for the service layer.

CHAPTER 4 OBJECT-ORIENTED PROGRAMMING WITH C# 2.0

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public class Employee { // GiveBonus() has a default implementation, however // child classes are free to override this behavior. public virtual void GiveBonus(float amount) { currPay += amount; } ... } When a subclass wishes to redefine a virtual method, it does so using the override keyword. For example, the SalesPerson and Manager could override GiveBonus() as follows (assume that PTSalesPerson overrides GiveBonus() in manner similar to SalesPerson): public class SalesPerson : Employee { // A salesperson's bonus is influenced by the number of sales. public override void GiveBonus(float amount) { int salesBonus = 0; if(numberOfSales >= 0 && numberOfSales <= 100) salesBonus = 10; else if(numberOfSales >= 101 && numberOfSales <= 200) salesBonus = 15; else salesBonus = 20; // Anything greater than 200. base.GiveBonus (amount * salesBonus); } ... } public class Manager : Employee { // Managers get some number of new stock options, in addition to raw cash. public override void GiveBonus(float amount) { // Increase salary. base.GiveBonus(amount); // And give some new stock options... Random r = new Random(); numberOfOptions += (ulong)r.Next(500); } ... } Notice how each overridden method is free to leverage the default behavior using the base keyword. In this way, you have no need to completely reimplement the logic behind GiveBonus(), but can reuse (and possibly extend) the default behavior of the parent class. Also assume that Employee.DisplayStats() has been declared virtual, and has been overridden by each subclass to account for displaying the number of sales (for salespeople) and current stock options (for managers). Now that each subclass can interpret what these virtual methods means to itself, each object instance behaves as a more independent entity: static void Main(string[] args) { // A better bonus system! Manager chucky = new Manager("Chucky", 50, 92, 100000, "333-23-2322", 9000);

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