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public IQueryable<Product> GetProducts() { return this.ObjectContext.Products; } The GetProducts operation returns an expression (via an IQueryable<T> interface type) that when executed by a LINQ provider will return a collection of the Product entity. Throughout this book, the LINQ provider we are using is the Entity Framework, although any LINQ provider can be used. Although you could return an actual collection from the query operation (such as a List<T>), returning an IQueryable<T> expression provides numerous benefits, and enables one of the most powerful features that RIA Services provides. By returning an expression (that hasn t been executed against the LINQ provider as yet), you enable RIA Services to add additional query criteria to the expression, which it can then execute, and can subsequently return the results to the client. As you will see in 6, the client can specify filtering, sorting, grouping, and paging criteria as a LINQ query when calling a query operation on the server. This LINQ query will then be serialized and sent to the server when calling the query operation, and these criteria will be appended to the existing query before it is executed and the results are returned to the client. This provides a neat, easy, and elegant way of passing criteria from the client to the server, and having them included them in the query to the database. Query operations can accept parameters as part of their signature, which you can use as an alternative means to pass filter and other criteria to the query operation. For example, the following query operation accepts a string that it will use to filter the results (and must be provided when calling the operation from the client): public IQueryable<Product> GetProducts(string nameFilter) { return this.ObjectContext.Products.Where(p => p.Name.StartsWith(nameFilter)); }



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Figure 5-8. The confirmation form a user sees after clicking the Delete button After clicking the Yes, Delete It button, the event is removed from the calendar (see Figure 5-9).

In addition to returning a collection of entities, you will often want to add a domain operation that returns a single entity matching the key you pass through to it as a parameter (this will support the drilldown-type scenario that will be covered in 7). To demonstrate this, we ll add a new domain operation to the ProductService domain service called GetProduct, which will return the Product entity with the matching ProductID passed through to it as a parameter: public Product GetProduct(int productID) { return ObjectContext.Products .Where(p => p.ProductID == productID) .FirstOrDefault(); }





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I Tip If you find yourself performing the same task repeatedly in code (for example, opening database connections, finding an item in a tree, and so on), that s a reliable indicator that some refactoring is in order; look for opportunities to create less code, rather than more. Every line we write is a line we must test, debug, and maintain.

Note GetProduct (which returns a single Product entity) is very similar in name to the default GetProducts domain operation, which returns a collection of Product entities. It s best not to have such similarly named operations on your domain service (it will cause confusion and lead to mistakes being made on both the server and the client); therefore, it s best to rename the GetProducts domain operation to something such as GetProductCollection or GetProductList, for example.

Summary

A query operation has no convention for its naming, and can accept any or no parameters. For it to be implicitly identified by the RIA Services code generator as a query operation, however, it must return an IQueryable<T>, IEnumerable<T>, or an entity. Otherwise, decorate the method with the Query attribute.

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One of the features of most modern content management systems is their ability to provide friendly URLs that permit users and search engines to access content without knowing arcane system details. In 9, we will explore in depth how to intercept incoming HTTP requests, parse them, and map them to specific data behind-the-scenes so that users can use URLs like http://oursite.com/contactus/ instead of http://oursite.com/content.aspx id=771a242e-19af-4dfc-a720-762491146acf. Without delving into the specifics of mapping content, it s sufficient to say that a reliable method of performing this type of task is via the global.asax file, and more specifically by writing code within the Application_BeginRequest() method. Listing 2 3 demonstrates a very simplified version of this process.

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