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The itemsInStock field is initialized with a value of 210 and the productName field with a value of Banana. Every instance of the Product class that is created will have the same initial values for these two fields. The values can be changed later (as we ll see in a moment), but they will all start the same. If your field is a reference type, you can construct an object of the field type using the new keyword and the class constructor, as shown in Listing 7-3. The differences between reference types and value types are discussed in 4. Listing 7-3. Initializing a Field Using the Field Type Constructor class Supplier { // class body } class Product { int itemsInStock = 210; string productName = "Banana"; Supplier productSupplier = new Supplier(); } The productSuppler field is of the Supplier type, which is also defined in Listing 7-3. The productSupplier field is initialized with a new instance of Supplier. The Supplier class doesn t have any fields yet, but we ll add some in a moment. In Listing 7-3, every instance of the Product class will have the same field values. The initial values for fields can also be supplied when an object is created; this means that different objects of the same type can have different initial field values. This is achieved using the class constructor. We cover constructors fully when we come to discuss methods in 9. Listing 7-4 contains an example of using the constructor in this way. rdlc pdf 417 PDF417 Barcode Creating Library for RDLC Reports | Generate ...
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Free trial package available to insert PDF - 417 barcode image into Client Report RDLC . Listing 7-4. Setting Field Values Using a Constructor class Supplier { string supplierName; public Supplier(string name) { supplierName = name; } } class Product { int itemsInStock = 210; string productName; Supplier productSupplier; public Product(string pname, string sname) { productName = pname; productSupplier = new Supplier(sname); } } The constructor for the Product class takes has two parameters, which are used to set the initial values for the productName and productSupplier fields. The code statements in the constructor are executed when a new instance of the Product class is created. We can supply different values for the constructor arguments, and these will result in instances of Product with different values for the fields. In Listing 7-4, the Supplier class has a field and a constructor, too. In the constructor of the Product class, I set the value of the productSuppler field to be a new instance of the Supplier class and use one of the constructor parameters to initialize the supplierName field in the Supplier class via the Supplier constructor. The following statements create new instances of the Product class with different field values: Product prod1 = new Product("Bananas", "Bob's Banana Shop"); Product prod2 = new Product("Apples", "Apples R Us"); If you define but don t initialize a field, the field value will be the default value for the field type, such as 0 for numeric types, null for reference types, and so on. A similar effect can also be achieved by supplying initial values to accessible fields when a new instance of a class is created; see the Constructors section in 9 for details. rdlc pdf 417 How to add Barcode to Local Reports ( RDLC ) before report ...
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Barcode Control SDK supports generating Data Matrix, QR Code, PDF - 417 barcodes in RDLC Local Report using VB and C# class library both in ASP.NET and ... The values assigned to fields are the state of an object, and as a program runs, we need to be able to read the fields to determine the state of the object and update the values of the field as the state evolves. For example, consider the Product class in Listing 7-4, which has a field called itemsInStock. If we sell some of the product, we need to reduce the field value to reflect the sale. If we receive a delivery, we need to increase the field value to reflect the new stock that has arrived. You can read and modify field values directly within your class. Listing 7-5 contains an example of the Product class and a method that reads and modifies the itemsInStock field. Methods are described fully in 9. Listing 7-5. Working Directly with Fields Inside a Class class Supplier { string supplierName; public Supplier(string name) { supplierName = name; } } class Product { int itemsInStock = 210; string productName; Supplier productSupplier; public Product(string pname, string sname) { productName = pname; productSupplier = new Supplier(sname); } public void ReadAndModifyFields() { // read the itemsInStock field value int readValue = itemsInStock; System.Console.WriteLine("Stock level: {0}", readValue); // modify the stock level itemsInStock = 10; // write out the (modified) itemsInStock field value System.Console.WriteLine("Stock level: {0}", itemsInStock); } } class Listing_05 { static void Main(string[] args) { // create a new instance of the Product type Product prod = new Product("Bananas", "Bob's Banana Shop"); prod.ReadAndModifyFields(); // wait for input before exiting System.Console.WriteLine("Press enter to finish"); System.Console.ReadLine(); $ 209,658,684 1.54 $ 136,142,002 $1,323,370,318 $50,10.41 } } The method is marked in bold. We read the value of the field with this statement:
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