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} We override a base method by using the override modifier on the derived method. The base method must be modified with the virtual keyword before it can be overridden. Both keywords are marked in bold in the listing. When we compile and run the code in Listing 9-33, we get the following results: Derived class message Derived class message Press enter to finish You can see from the results that the derived version of the method is used even when we refer to the object as an instance of the base class. An overridden method can be overridden itself, as Listing 9-34 demonstrates. Listing 9-34. Overriding an Already Overridden Method class BaseClass { public virtual void PrintMessage() { Console.WriteLine("Base class message"); } } class DerivedClass : BaseClass { public override void PrintMessage() { Console.WriteLine("Derived class message"); } } class FurtherDerivedClass : DerivedClass { public override void PrintMessage() { Console.WriteLine("Further derived class message"); } } If you have used another object-oriented language, this is probably the behavior you are expecting and will use most frequently. In fact, hiding, rather than overriding methods, is a pretty unusual thing. Often you will want to override a method but do so in a way that manipulates the result of the base method. You can access the base method through the base keyword and the dot (.) operator. Listing 935 contains an example. Listing 9-35. Calling an Overridden Method class Calculator { public virtual int CalculateSum(int x, int y) { asp.net upc-a UPC-A . NET Control - UPC-A barcode generator with free . NET ...
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NET UPC-A Generator Controls to generate GS1 UPC-A barcodes in VB. NET , C# applications. Download Free Trial Package | Developer Guide included ... return x + y; } } class DoubleResultCalc : Calculator { public override int CalculateSum(int x, int y) { // call the base implementation of this method int interimResult = base.CalculateSum(x, y); // return twice the result we got from the base class return interimResult * 2; } } In this example, the DoubleResultCalc class overrides the CalculateSum method with an implementation that uses the base keyword to call the original method version and returns doubles the result. asp.net upc-a UPC-A Barcode Generator for ASP . NET Web Application
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The UPC-A Code and the assignment of manufacturer ID numbers is controlled in the ... ASP . NET /Windows Forms/Reporting Services/Compact Framework ... If you are writing a base class and you don t want anyone to override your method, you can simply omit the virtual modifier. Derived classes can still hide your method, but they can t override it (you saw an example of this in Listing 9-30). Methods that override other methods can themselves be overridden by default. In other words, if you have used the override modifier on a method, then classes that derive from your class can also use the override keyword. You can prevent this by using the sealed modifier, as demonstrated by Listing 9-36. Listing 9-36. Sealing a Method class Calculator { public virtual int CalculateSum(int x, int y) { return x + y; } } class DoubleResultCalc : Calculator { public sealed override int CalculateSum(int x, int y) { // call the base implementation of this method int interimResult = base.CalculateSum(x, y); // return twice the result we got from the base class return interimResult * 2; } } Structs can implement interfaces and, like classes, can implement more than one interface. Listing 12-18 demonstrates a simple struct that implements an interface. The discount rate is needed to convert future pro ts into net present value of pro t so that these pro ts can be added together to get the cumulative pro t The lifetime value is determined by dividing the cumulative NPV of pro t by the original 200,000 customers to determine the value of a newly acquired customer In this case, the newly acquired customers are worth $18 in the third year This is the value to a company selling CDs that has already acquired these customers So to the dot com the names are worth $18 to their owner What would they be worth to a potential buyer Let us assume that the potential buyer is selling a product of similar value, so that the buyer s customer lifetime value once it has acquired the customers would be identical $18. Listing 12-18. Implementing an Interface in a Struct interface ISalesItem { int PricePerItem(); } public struct Product : ISalesItem { public int CasesInStock; public int ItemsPerCase; public Product(int cases, int itemspc) { CasesInStock = cases; ItemsPerCase = itemspc; } public int PricePerItem() { return 100; } } You can upcast a struct value to the interface type, like this: class Listing 18 Test { static void Main(string[] args) { // create a new struct value and upcast to the interface type ISalesItem salesItem = new Product(10, 10); // call the method specified in the interface int price = salesItem.PricePerItem(); Console.WriteLine("Price per item: {0}", price); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } As with classes, when you upcast a struct value, you can only access the members specified by the interface and not any additional members that the struct has introduced.
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