winforms code 128

winforms code 128

winforms code 128

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} To make generics more useful, therefore, you need to be able to supply additional information to the compiler about what kinds of types are acceptable as arguments These additional bits of information are called constraints Only types that meet the constraints can be substituted for the given type parameter..

Constraints are listed as where clauses. Each type parameter that has constraints has its own where clause. If a parameter has multiple constraints, they are listed in the where clause, separated by commas. The syntax of a where clause is the following: Type parameter Constraint list where TypeParam : constraint, constraint, ... Keyword Colon The important points about where clauses are the following: They re listed after the closing angle bracket of the type parameter list. They re not separated by commas or any other token. They can be listed in any order. The token where is a contextual keyword, so you can use it in other contexts.

(d ) 50 percent (b) Build a data warehouse (b) Net present value (c) The basic product sales are produced by other channels. (d ) Because the compensation system cannot be changed (c) Mass marketing

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In the Draw method of your application, you want the SpriteBatch object to draw your texture: spriteBatch.Begin(); spriteBatch.Draw(myTexture, new Vector2(50, 100), Color.White); spriteBatch.End(); This will render your image to the screen. The second argument allows you to specify where you want it to be positioned on the screen. More specifically, you can define on which pixel of your window you want the top-left corner of the image to be positioned. The top-left corner of your window corresponds to the (0,0) point, so in this case there will be 50 pixels between the left border of the window and your image, and there will be 100 pixels between the top border of your window and your image. You find more information about the last argument at the end of this recipe.

For example, the following generic class has three type parameters. T1 is unbounded. For T2, only classes of type Customer, or classes derived from Customer, can be used as type arguments. For T3, only classes that implement interface IComparable can be used as type arguments. Unbounded With constraints No separators class MyClass < T1, T2, T3 > where T2: Customer where T3: IComparable { ... No separators }

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There are five types of constraints. These are listed in Table 19-2. Table 19-2. Types of Constraints

ClassName class struct InterfaceName new()

1. (b) The public feared that the government was going to go after the Web next. 2. (c) The Web is a passive medium. 3. (b) Because of the economics of the supermarket industry 4. (a) There are none. It is a wonderful idea. 5. (b) The e-Citi customers could not use Citibank branches. 6. (c) Many competitors copied its ideas and stole its customers. 7. (c) Keep customer communications to a minimum. 8. (b) Don t try to compete with telephone customer service. 9. (e) Customer service 10. (e) Consumer product sales

Only classes of this type, or classes derived from it, can be used as the type argument. Any reference type, including classes, arrays, delegates, and interfaces, can be used as the type argument. Any value type can be used as the type argument. Only this interface, or types that implement this interface, can be used as the type argument. Any type with a parameterless public constructor can be used as the type argument. This is called the constructor constraint.

The where clauses can be listed in any order. The constraints in a where clause, however, must be placed in a particular order, as shown in Figure 19-9. There can be at most one primary constraint, and if there is one, it must be listed first. There can be any number of InterfaceName constraints. If the constructor constraint is present, it must be listed last.

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Figure 19-9. If a type parameter has multiple constraints, they must be in this order. The following declarations show examples of where clauses: class SortedList<S> where S: IComparable<S> { ... } class LinkedList<M,N> where M : IComparable<M> where N : ICloneable { ... } class MyDictionary<KeyType, ValueType> where KeyType : IEnumerable, new() { ... }

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