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using System; using System.Collections.Generic; using System.Linq; namespace LinqInAction.Extensibility { public static class SumExtensions { public static long LongSum(this IEnumerable<int> source) { if (source == null) throw new ArgumentNullException("source"); long sum = 0; checked { foreach (int v in source) sum += v; } return sum; } public static long LongSum(this IEnumerable<int > source) { if (source == null) throw new ArgumentNullException("source"); long sum = 0; checked { foreach (int v in source) if (v != null) sum += v; } return sum; } public static long LongSum<T>(this IEnumerable<T> source, Func<T, int> selector) { return SumExtensions.LongSum(Enumerable.Select(source, selector)); } public static long LongSum<T>(this IEnumerable<T> source, Func<T, int > selector) { return SumExtensions.LongSum(Enumerable.Select(source, selector)); } } }

For details about the different data types that you can assign to fields in your tables, see Defining Fields, page 100.

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Many types of applications need to monitor volumes for file and directory changes For example, an automatic backup program might perform an initial full backup and then incremental backups based on file changes An obvious way for an application to monitor a volume for changes is for it to scan the volume, recording the state of files and directories, and on a subsequent scan detect differences This process can adversely affect system performance, however, especially on computers with thousands or tens of thousands of files An alternate approach is for an application to register a directory notification by using the FindFirstChangeNotification or ReadDirectoryChangesW Windows function As an input parameter, the application specifies the name of a directory it wants to monitor, and the function returns whenever the contents of the directory change.

Click the Next button to move to the next window. If you have other tables already defined in your database, the Table Wizard shows you a list of those tables and tells you whether it thinks your new table is related to any of the existing tables. If the wizard finds a primary key in another table with the same name and data type as a field in your new table (or vice versa), 98

The new LongSum operator we ve just created in listing 12.2 returns the numerical sum of a sequence of ints or nullable ints as a long or nullable long. This gives more range for the results compared to the default Sum operator. This demonstrates how you can improve your LINQ experience with query operators that work the way they should, or at least the way you want them to work. This kind of extensibility ensures that you are not stuck with a static predefined set of operators. The example we ve just seen shows how to fix a problem with a standard query operator. But this isn t the only way we can extend LINQ to solve a problem or to improve our code. Creating custom query operators can be useful in other situations, as you ll see next.

Creating Your Database and Tables it assumes that the tables are related. If you think the wizard has made a mistake, you can tell it not to create a relationship (a link) between your new table and the existing table. You ll learn how to define your own relationships between tables later in this chapter. Because this is the first and only table in this database, you won t see the Relationships window in the Table Wizard. Instead, the wizard shows you a final window in which you can choose to modify the table design, open it as a datasheet, or call another wizard to build a form to edit your data as shown in Figure 4-18.

Select the Modify the table design option and click Finish to let the wizard build your table. The table will open in Design view, as shown in Figure 4-19. In the next chapter, you ll learn how to modify this table in Design view to exactly match the tblContacts table in the LawTrack Contacts database. For now, close the Table window so that you can continue building other tables that you need.

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