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Defining Relationships Using Entity Classes



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[book] [en] Pro C# 2008 and the NET 3.5 Platform Fourth Edition

Defining Relationships Using Entity Classes

Beyond simply defining properties with backing fields to represent data table columns, the

sqlmetal.exe utility will also model the relationships between interrelated tables using the

EntitySet type. Recall from Chapter 22 that the AutoLot database defined three interrelated

tables, connected by primary and foreign keys. Rather than forcing us to author SQL-centric join

syntax to navigate between these tables, LINQ to SQL allows us to navigate using the object-centric

C# dot operator.

To account for this sort of table relationship, the parent entity class may encode the child table

as property references. This property is marked with the [Association] attribute to establish an

association relationship made by matching column values between tables. For example, consider

the (partial) generated code for the Customer type, which can have any number of orders:

[Table(Name="Customers")]

public partial class Customers :

INotifyPropertyChanging, INotifyPropertyChanged

{

private EntitySet _Orders;




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