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Querying an associated class in LINQ to SQL is as simple as accessing a member variable of an entity class. This is because an associated class is a member variable of the related entity class or stored in a collection of entity classes, where the collection is a member variable of the related entity class. If the associated class is the many (child) side of a one-to-many relationship, the many class will be stored in a collection of the many classes, where the type of the collection is EntitySet<T>, and T is the type of the many entity class. This collection will be a member variable of the one class. If the associated class is the one (parent) side of a one-to-many relationship, a reference to the one class will be stored in a variable of type EntityRef<T>, where T is the type of the one class. This reference to the one class will be a member variable of the many class. For example, consider the case of the Customer and Order entity classes that were generated for the Northwind database. A customer may have many orders, but an order can have but one customer. In this example, the Customer class is the one side of the one-to-many relationship between the Customer and Order entity classes. The Order class is the many side of the one-to-many relationship. Therefore, a Customer object s orders can be referenced by a member variable, typically named Orders, of type EntitySet<Order> in the Customer class. An Order object s customer can be referenced with a member variable, typically named Customer, of type EntityRef<Customer> in the Order class (see Figure 14-1).

As with the XMLHttpRequest object methods, two properties will be used more frequently than the others responseText and responseXML. You can use these two properties to access data returned with the response. The responseText property provides a string representation of the data, which is useful in case the requested data comes in as plain text or HTML. Depending on the context, the responseXML property offers a more extensive representation of the data. The responseXML property will return an XML document object, which can be examined using W3C DOM node tree methods and properties.

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Classes are associated by specifying the Association attribute on the class property that contains the reference to the associated class in the entity class definition. Since both the parent and child have a class property referencing the other, the Association attribute is specified in both the parent and child entity classes. We will discuss the Association attribute in depth in 15. Listing 14-7 is an example where we query for certain customers and display the retrieved customers and each of their orders.

Order (Child) EntityRef<Customer> Customer Order (Child) EntityRef<Customer> Customer Order (Child) EntityRef<Customer> Customer

} } Notice that both the class and every method it contains are static. Now you can take advantage of those extension methods by calling the static methods on the object instances, as shown in Listing 215. Because the ToDouble method is static and its first argument specifies the this keyword, ToDouble is an extension method.

If you have a difficult time remembering which end of the relationship is stored in which variable type, just remember that a child has one parent, so therefore it is stored in a single reference So, the child stores the associated parent in a variable of type EntityRef<T> Since a parent can have many children, it needs to store the references to the children in a collection So, the parent stores the references to the children in a variable of type EntitySet<T> Classes are associated by specifying the Association attribute on the class property that contains the reference to the associated class in the entity class definition Since both the parent and child have a class property referencing the other, the Association attribute is specified in both the parent and child entity classes I will discuss the Association attribute in depth in 15.

using Netsplore.Utilities; double pi = "3.1415926535".ToDouble(); Console.WriteLine(pi); This produces the following results: 3.1415926535 It is important that you specify the using directive for the Netsplore.Utilities namespace; otherwise, the compiler will not find the extension methods, and you will get compiler errors such as the following: 'string' does not contain a definition for 'ToDouble' and no extension method 'ToDouble' accepting a first argument of type 'string' could be found (are you missing a using directive or an assembly reference ) As mentioned previously, attempting to declare an extension method inside a nonstatic class is not allowed. If you do so, you will see a compiler error like the following: Extension methods must be defined in a non-generic static class

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