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When you derive one class from another, you can provide your own implementations of the methods in the base class. You do this to provide an implementation of the action that the method performs, which is specialized to the derived type. If you are new to object programming and you don t know why you would want to do this, then I give some examples in the Understanding Method Specialization section after I have explained the related C# features. Listing 9-30 contains a simple example. Listing 9-30. Implementing a Base Class Method in a Derived Class using System; class BaseClass { public void PrintMessage() { Console.WriteLine("Base class message"); } } class DerivedClass : BaseClass { public void PrintMessage() { Console.WriteLine("Derived class message"); } } class Listing 30 { static void Main(string[] args) { // create a new instance of the base class BaseClass bClass = new BaseClass(); // print out the message bClass.PrintMessage(); // create a new instance of the derived class DerivedClass dClass = new DerivedClass(); // print out the message dClass.PrintMessage(); // create a new instance of DerivedClass but // assign it to a BaseClass local variable bClass = dClass; // print the message bClass.PrintMessage(); // wait for input before exiting Console.WriteLine("Press enter to finish"); asp.net ean 13 EAN - 13 ASP . NET Control - EAN - 13 barcode generator with free ...
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19 Apr 2005 ... NET 2005 - 7.40 Kb ... The EAN - 13 barcode is composed of 13 digits, which are made up of the following sections: the first 2 or 3 digits are the ... Console.ReadLine(); } } In this example, the class DerivedClass derives from BaseClass and implements its own PrintMessage method. We create an instance of BaseClass and call the PrintMessage method. We then create an instance of DerivedClass and call the PrintMessage method. Finally, we assign the DerivedClass to the BaseClass local variable and then call PrintMessage again. Compiling and running the code in Listing 9-30 produces the following results: Base class message Derived class message Base class message Press enter to finish The first and second lines of the output are what we might expect, but the third line is often a surprise to programmers who are new to C#. The PrintMessage method we added to DerivedClass doesn t replace the method of the same name in the base class; it adds a new, distinct method. In the following sections, I ll explain why this happens, how to make use of this feature, and how to get the behavior that you might have been expecting. asp.net ean 13 .NET EAN 13 Generator for C#, ASP . NET , VB.NET | Generating ...
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