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if (e.Key == Key.Enter) { int index = helloConsole.Text.LastIndexOf(">>>"); String code = helloConsole.Text.Substring(index + 3); String result = scriptEngine.Execute(code); helloConsole.Text += result + "\n>>>"; helloConsole.SelectionStart = helloConsole.Text.Length; } }

<SelectParameters> <asp:QueryStringParameter QueryStringField="ID" Name="ID" ConvertEmptyStringToNull="False"> </asp:QueryStringParameter> </SelectParameters> </asp:ObjectDataSource> The Person class created by Blinq in the 08BlinqDAL namespace includes the GetPerson, Insert, Update, and Delete methods The ID value that is used to query the database for an individual record is set to be pulled from the query string The code generated by Blinq is placed in two source files, 08cs and StaticMethodscs, in the App_Code folder of the website The name of the first source file comes from the name of the database You could pull these files out to a class library to make them reusable from a central point as a dependency What is so interesting about Blinq is how simple and to the point the code is for working with the data Listing 8-23 shows the GetPerson method from the Person class Listing 8-23.

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If you run the Silverlight application, you ll see a textbox with the >>> console prompt showing up in the browser. If you type some dummy characters and press enter, you ll see something that looks like Figure 11-3.

GetPerson Method public static Person GetPerson(Int64 ID) { 08 db = 08CreateDataContext(); return dbPersonsWhere(x=>xID == ID)FirstOrDefault(); } The query is a single line There is no stored procedure on the other end The LINQ system creates all of the necessary SQL and uses it to get the data and populate the Person object That is all there is to it! The LINQ query simply matches the ID column with the ID value passed into the method Another method, GetPersonsByLocation, is a little more complex because it handles the relationship between the Person and Location tables It is shown in Listing 8-24 Listing 8-24 GetPersonsByLocation Method public static IQueryable<Person> GetPersonsByLocation(Int64 ID) { 08 db = 08CreateDataContext(); return dbLocationsWhere(x=>xID == ID)SelectMany(x=>xPersons); } The GetPersonsByLocation query takes the ID for a Location, and from there it selects multiple Person records.

In the previous section we developed a Silverlight application that displays a console for the Hello language. The Silverlight application does not depend on the Microsoft.Scripting.Silverlight.dll assembly and does not use any of the Gestalt-like components. Now let s take the just text approach and use the Microsoft.Scripting.Silverlight.dll assembly to host the Hello language console in a Silverlight application. I will walk you through the steps you need to take to build your own Gestalt-like components that support your custom language. The example we ll build requires creating the following:

As you can see, there is some query chaining happening here This is going to become a familiar coding style as you use LINQ more and more in your work The results from one query can be passed through another query to filter the final result And while you may think the query appears to be inefficient, you will be pleasantly surprised that the inner workings of the LINQ runtime environment handle several optimizations that speed up your queries while allowing you to write code that is more readable to you I will get into LINQ a great deal more in 10 with a series of examples that will explain what is going on here in more detail..

Looping and branching are major building blocks of a computer program. In this chapter, you learned the commands and operators used for these tasks.

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