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A nice solution would be if you could call the static Where method on each Enumerable object itself, rather than on the class. Then it would no longer be necessary to pass each Enumerable into the Where method because the Enumerable object would have access to its own internal Enumerable. That would change the syntax of the query proposed previously to something more like this: Enumerable enumerable = {"one", "two", "three"}; Enumerable finalEnumerable = enumerable.Where(lX1).Where(lX2).Where(lX3);

To override the Customer entity class s insert method, first make sure the Methods pane is visible. If it is not, right-click the canvas, and select the Show Methods Pane context menu item. Next, open the Server Explorer window in Visual Studio. Find and expand the Stored Procedures node in the appropriate database node in the tree. Your Visual Studio should look very similar to Figure 13-5.

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This could even be rewritten as the following: Enumerable enumerable = {"one", "two", "three"}; Enumerable finalEnumerable = enumerable .Where(lX1) .Where(lX2) .Where(lX3); Wow, that s much easier to read. You can now read the statement from left to right, top to bottom. As you can see, this syntax is very easy to follow once you understand what it is doing. Because of this, you will often see LINQ queries written in this format in much of the LINQ documentation and in this book. Ultimately what you need is the ability to have a static method that you can call on a class instance. This is exactly what extension methods are and what they allow. They were added to C# to provide a syntactically elegant way to call a static method without having to pass the method s first argument. This allows the extension method to be called as though it were a method of the first argument, which makes chaining extension method calls far more readable than if the first argument was passed. Extension methods assist LINQ by allowing the Standard Query Operators to be called on the IEnumerable<T> interface.

F igure 1 3- 5 . Finding the stored procedure Once you have found your stored procedure, simply drag it to the Methods pane, which is the window to the right of the entity class model. Figure 13-6 shows Visual Studio after we have dragged the InsertCustomer stored procedure to the Methods pane.

open("method", "URL") send(content) abort() getResponseHeader("headerLabel") getAllResponseHeaders() setRequestHeader("label", "value")

Dragging a stored procedure from the Server Explorer window to the Methods pane is the way you instruct the designer to generate the code necessary to call the stored procedure from LINQ to SQL. This is also the same way you instruct the designer to generate the code for a user-defined function too. Making the stored procedure accessible from LINQ to SQL is the first step to having the insert, update, or delete operation call a stored procedure instead of the default method. The next step is to override one of those operations to call the now accessible stored procedure. Now that the InsertCustomer stored procedure is in the Methods pane, select the Customer class in the designer canvas, and examine the Properties window for the Customer class. You will now see a list of the Default Methods. Select the Insert method by clicking it. You will now be presented with the ellipses ( ) selection button as is displayed in Figure 13-7. Now, simply click the ellipses selection button to display the Configure Behavior dialog box. Select the Customize radio button, and select the InsertCustomer stored procedure from the drop-down list. Map the Method Arguments on the left to the appropriate Customer Class Properties on the right, as illustrated in Figure 13-8.

Extension methods are methods that while static can be called on an instance (object) of a class rather than on the class itself.

F igure 1 3- 7 . Select the Insert method in the Default Methods category of the Properties window.

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