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You can upcast to any of the base types of an object, not just the immediate base type. The demonstration of this is simple. Remember that all classes are derived from System.Object. We can upcast any C# object to this type. Listing 6-19 contains a simple demonstration using the Car and VolvoCar classes from the previous example.

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This Visual Studio project illustrates how to generate a QR Code barcode in ASP . NET Core with a .NET Standard/.NET Core DLL. The NETStandardQRCode.dll ...

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20 Apr 2019 ... Inside “Controllers” Folder create a new File as “QRController.cs” & add this Code . Inside the 'Index' method, I'm generating QR Code . 'BitmapToBytes' method is for converting Image bitmap into a bytes array for displaying in an HTML Page. Now run your Application.

Listing 6-19. Casting to Any Base Type class Listing 19 { static void Main(string[] args) { // create an instance of VolvoCar VolvoCar myVolvo = new VolvoCar("Adam Freeman", "Black", 30, "Premium"); // upcast from VolvoCar to Car Car myCar = myVolvo; // upcast from Car to object object myObject = myCar; // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } In this example, I created a VolvoCar object and upcast it to Car and then upcast again to System.Object (for which C# allows you to use the object keyword). Although I upcast from VolvoCar to object in steps in the example, you can directly upcast to any base class of an object, like this:

object myObject = new VolvoCar("Adam Freeman", "Black", 30, "Premium");

asp.net core qr code generator

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23 May 2019 ... Run your application and go to the URL — ' http://localhost:50755/QRCoder ' to invoke the Index Action method. In the text box, add your text and click the submit button to create the QR Code Bitmap image.

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NET Core application. There are packages available for ASP . NET Core to generate qrcode . One of the package is, "jquery- qrcode " (Search for ...

You can then determine what Asian cars the owners of 1997 models owned in the summer of 2002 Next, you create the same tables for the owners of 1998, 1999, 2000, and 2001 models Finally, you have to create similar tables for Certi ed Previously Owned (CPO) Asian cars Asian cars that were bought used These data are usually available because manufacturers require their dealers to report the owners of each new and each used Asian This information is stored in Asian s database Table 4-1 shows what the 1997 Asian owners owned in the year 2002 From these data, one would assume that the repurchase rate varied from 22 to 38 percent, but that is not the case To get the real repurchase rates, you have to gure in the Asian owners who bought cars every year, every 2 years, and so on.

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Casting is the process of converting an object of one type into another. We saw examples of this when we looked at upcasting in the section on polymorphism. We say that an object of one type is cast to another type, for example, that a VolvoCar object was cast to Car. In this section, we ll look at the different C# features that support casting and those that can help ensure that casting doesn t cause problems in your program.

By specifying the names x and y as arguments to @ConstructorProperties, you are saying that methods named getX() and getY() are available to access the property values. And, of course, that x comes first in the argument list.

Note The examples in the following sections are focused on reference objects, but you can also cast between value types; see 5 for examples of casting and converting between numeric types.

There are two kinds of casting available in C#: implicit and explicit casting. We have already seen examples of implicit casting when we were upcasting in the section covering polymorphism. Implicit casting, also known as coercion, is performed automatically by the compiler when it is safe to do so. Listing 6-20 contains two examples.

Listing 6-20. Implicit Casting using System; class Car { public string CarOwner; public string PaintColor; public int MilesPerGallon; public Car(string newOwner, string paintColor, int mpg) { CarOwner = newOwner; PaintColor = paintColor; MilesPerGallon = mpg; } } class VolvoCar : Car { public string VolvoSoundSystem; public VolvoCar(string owner, string paint, int mpg, string sound) : base(owner, paint, mpg) { // set the value of the VolvoSoundSystem VolvoSoundSystem = sound; } } class Listing 20 { static void Main(string[] args) { // create a VolvoCar object VolvoCar myVolvo = new VolvoCar("Adam Freeman", "Black", 30, "Premium"); // perform an implicit cast by upcasting Car myCar = myVolvo; // perform an implicit cast by calling a method // that takes a base type as a parameter PrintCarDetails(myVolvo); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } static void PrintCarDetails(Car car) { Console.WriteLine("--- Car Details ---"); Console.WriteLine("Owner: {0}", car.CarOwner); Console.WriteLine("Color: {0}", car.PaintColor); Console.WriteLine("Mileage: {0}", car.MilesPerGallon);

The numbers shown in Table 4-1 mask the fact that in the 5 years between 1997 and 2002, a signi cant Table 4-1 Changes in Ownership over the Years.

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