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The data portal provides a single point of entry and configuration for the server. It manages communication with the business objects while they re on the server running their data access code. Additionally, the data portal concept provides the following other key benefits: Centralized security when calling the application server A consistent object-persistence mechanism (all objects persist the same way) Abstraction of the network transport between client and server (enabling support for remoting, Web Services, Enterprise Services, and future protocols) One point of control to toggle between running the data access code locally, or via remoting The data portal functionality is designed in several parts, as shown in Table 2-3. Table 2-3. Parts of the Data Portal Concept

Console.ReadLine(); } static void printArrayDetails(string[] arr) { // report the size of the array Console.WriteLine("Array Length: {0}", arr.Length); // report on the contents of the array foreach (string s in arr) { if (s == null) { Console.WriteLine("Item: null"); } else { Console.WriteLine("Item: {0}", s); } } } } The Copy method takes the source array, the destination array, and the number of items to copy as parameters. There are overloaded versions of the Copy method available that allow you to be more selective about the data that is copied. Arrays inherit the instance method CopyTo, which copies all the items in the array to another array. I could have replaced the Copy statement in bold in the listing with the following, where the parameters are the array to copy the data into and the index to start the copy from:

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Now upon clicking the Export to Excel button, a visible instance of the Microsoft Excel application will be created with the workbook added to it. Then using the foreach loop, contents of BooksGrid will populate this workbook. The following is the self-explanatory code (with proper comments) for the btnExportExcel_Click event handler. private void btnExportExcel_Click(object sender, RoutedEventArgs e) { // create an instance of excel dynamic excel = AutomationFactory. CreateObject("Excel.Application"); // make it visible to the user. excel.Visible = true; // add a workbook to the instance dynamic workbook = excel.workbooks.Add(); // get the active sheet dynamic sheet = excel.ActiveSheet; dynamic cell = null; int i = 1; // iterate through our data source and populate //the excel spreadsheet foreach (BookInfo item in BooksGrid.ItemsSource) { cell = sheet.Cells[i, 1]; // row, column cell.Value = item.Title; cell.ColumnWidth = 25; cell = sheet.Cells[i, 2]; cell.Value = item.Author; cell = sheet.Cells[i, 3]; cell.Value = item.isbn; cell = sheet.Cells[i, 4]; cell.Value = item.Url; i++; } } Similarly, the btnExportWord_Click event handler will populate the word table with the contents of BooksGrid. private void btnExportWord_Click(object sender, RoutedEventArgs e) { // create an instance of excel dynamic word = AutomationFactory. CreateObject("Word.Application"); // make it visible to the user. word.Visible = true; // add a new Document to the instance

Extension methods are described in detail in 7 and work just as well with generic classes. They allow you to associate a static method in one class with a different generic class and to invoke the method as if it were an instance method on a constructed instance of the class. As with nongeneric classes, an extension method for a generic class must satisfy the following constraints: It must be declared static. It must be the member of a static class. It must contain as its first parameter type the keyword this, followed by the name of the generic class it extends.

KeyStack<string, int> stack = new KeyStack<string, int>();

You can use one of two techniques to prevent this issue. You can add a static constructor to each of your custom base classes, or you can ensure that some static field is initialized as each object instance is created.

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The text between the start and end markers is ignored by the compiler. Comments of this type contain XML text that is meant to be used by a tool to produce program documentation.

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