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Objects should not know how to save themselves, or load themselves, or filter themselves. That s a familiar mantra in software development and especially in Domain Driven Development. There is a good bit of wisdom in the mantra. Having persistence knowledge bound too tightly to our domain objects complicates testing, refactoring, and reuse. The classes generated by Entity Framework for our model entities are heavily dependent on the plumbing of Entity Framework. For some developers, these classes know too much about the persistence mechanism and are too closely tied to the concerns of models and mapping. There is another option. The Entity Framework also supports using your own classes for the entities in the model. The term Plain Old CLR Objects, often referred to simply as POCO, isn t meant to imply that your classes are either plain or old, but simply that they don t contain any reference at all to specialized frameworks. They don t need to derive from third-party code. They don t need to implement any special interface. And they don t need to live in any special assembly or namespace. You implement your domain objects however you see fit and tie them to the model with a custom object context. With that, you are all set to leverage all the power of Entity Framework and follow just about any architectural pattern you choose. This chapter covers a wide variety of recipes specific to POCO. The first recipe shows you the basics of using POCO. The remaining recipes focus on loading entities and keeping Entity Framework in sync with state of your objects. In this chapter, we ve purposefully focused on writing most of the POCO-related code by hand to demonstrate how things work. Much of the work of building the POCO plumbing goes away if you use the POCO T4 template available from the ADO.NET development team at Microsoft.
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8-1. Using POCO
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You want to use Plain Old CLR Objects (POCO) in your application.
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Solution
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Let s say you have a data model like the one shown in Figure 8-1.
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PLAIN OLD CLR OBJECTS
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Figure 8-1. A database model for customers and their orders To create an Entity Framework model based on the database tables in Figure 8-1 and using your own classes representing an Order, OrderDetail, Customer, and Product, do the following: 1. 2. 3. 4. 5. Right-click your project and select Add New Item.
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From the Visual C# Items Data templates, select ADO.NET Entity Data Model. Select Generate from database to create the model from our existing tables. Select the Order, OrderDetail, Customer, and Product tables; and click Next. In the generated model, the Product entity has an OrderDetails navigation property for all the order details associated with this product. This is unnecessary here, so delete this navigation property. The completed model is shown in Figure 8-2.
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Figure 8-2. The model for our customers orders
PLAIN OLD CLR OBJECTS
We won t be using generated classes for our entities, so turn off code generation for the model. Right-click the design surface and select Properties. Change the Code Generation Strategy to None. Create a class for each of the entities in our model. Make sure you use the exact same name for the class and each property as we have in the model. Use ISet<T> as the type for each of the navigation properties. The code in Listing 81 shows the classes for our model.
Listing 8-1. The plain old CLR classes for our model public class Customer { public int CustomerId { get; set; } public string ContactName { get; set; } public ISet<Order> Orders {get; set;} public Customer() { this.Orders = new HashSet<Order>(); } } public class Order { public int OrderId {get; set;} public int CustomerId {get; set;} public DateTime OrderDate {get; set;} public Customer Customer {get; set;} public ISet<OrderDetail> OrderDetails {get; set;} public Order() { this.OrderDetails = new HashSet<OrderDetail>(); } } public class OrderDetail { public int OrderId {get; set;} public int ProductId {get; set;} public decimal UnitPrice {get; set;} public int Quantity {get; set;} public Order Order {get; set;} public Product Product {get; set;} } public class Product { public int ProductId {get; set;} public string ProductName {get; set;} public decimal UnitPrice {get; set;} }
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