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This now guarantees that a child form will pick up the global PixelDlg form as needed Of course, this change also causes the dialog to be created even when it is not used Such a change might not be appropriate in a large application with multiple utility forms such as our pixel dialog For our purposes, it is okay Compile and run the program to verify that our new code works Also realize that these changes are consistent with our non-MDI application When a single MainForm instance is present, it will now use the global PixelDlg instance to create the dialog, and all code will work as we originally intended in chapter 8 You can test this by modifying the MyPhotos project settings to use the MainFormMain method as the entry point The PixelDlg form is now integrated into our MDI application.

// Use an anonymous type to improve the join demo program using System; using SystemLinq; // A class that links an item name with its number class Item { public string Name { get; set; } public int ItemNumber { get; set; } public Item(string n, int inum) { Name = n; ItemNumber = inum; } } // A class that links an item number with its in-stock status class InStockStatus { public int ItemNumber { get; set; } public bool InStock { get; set; } public InStockStatus(int n, bool b) { ItemNumber = n; InStock = b; } } class AnonTypeDemo { static void Main() { Item[] items = { new Item("Pliers", 1424), new Item("Hammer", 7892), new Item("Wrench", 8534), new Item("Saw", 6411) }; InStockStatus[] statusList = new InStockStatus(1424, new InStockStatus(7892, new InStockStatus(8534, new InStockStatus(6411, }; { true), false), true), true)

19:

The next task is to ensure that we do not open multiple windows for the same album file 1643 OPENING AN ALBUM TWICE In our current code for the Open menu, the user selects an album and a new child window is created to contain this album This is fine as long as the selected album has not been previously opened by the user In the case where a MainForm window already exists for the selected album, it would be more appropriate to simply display the existing window at the top of the z-order This can be done by searching through the list of child windows for one that displays the selected album The MdiChildren property in the Form class retrieves the collection of child forms assigned to an MDI container form This property can be treated like any other array to search for a matching form.

// Create a query that joins Item with InStockStatus to // produce a list of item names and availability // Now, an anonymous type is used var inStockList = from item in items join entry in statusList on itemItemNumber equals entryItemNumber select new { Name = itemName, InStock = entryInStock }; ConsoleWriteLine("Item\tAvailable\n"); // Execute the query and display the results foreach(var t in inStockList) ConsoleWriteLine("{0}\t{1}", tName, tInStock); } }

This property is useful whenever a specific form is desired, as we do here It can also be used to see if any child forms are present in an MDI application and to obtain the number of MDI child forms, although checking the ActiveMdiChild property is typically a more efficient mechanism for the former task 551.

Pay special attention to the select clause:

select new { Name = itemName, InStock = entryInStock };

When implementing this change, we should keep in mind the fact that forms other than our MainForm class might be contained by this array. The following steps detail a solution for this change with this fact in mind.