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CREATING A YESNO DIALOG As an alternate example, what happens when an error occurs while saving an album We could simply display an OK dialog as we did while opening an album. This would just duplicate the previous code, so we will do something different. Instead, we will allow the user to save the album under an alternate file name. This permits the user to save the album to an alternate location that is less likely to fail, or retry the save to the same location. The new message box is shown in figure 8.3.

The program produces the following output:

1 2 3 4 9 8 7 11 12 13 14 15

The steps required to generate this message dialog are shown in the following table:

Pay special attention to the declaration of jagged:

HANDLE EXCEPTION IN MENUSAVE_CLICK METHOD Action 1 Locate the menuSave_Click method in the MainForm.cs file. Result

var jagged new[] { new[] { new[] { }; = new[] { 1, 2, 3, 4 }, 9, 8, 7 }, 11, 12, 13, 14, 15 }

Notice how new[ ] is used in two ways First, it creates the array of arrays Second, it creates each individual array, based on the number and type of initializers As you would expect, all of the initializers in the individual arrays must be of the same type The same general approach used to declare jagged can be used to declare any implicitly typed jagged array As mentioned, implicitly typed arrays are most applicable to LINQ-based queries They are not meant for general use In most cases, you should use explicitly typed arrays

private void menuSave_Click (object sender, System.EventArgs e) { . . . else { try { // Save album in current file _album.Save(); _bAlbumChanged = false; } catch (Exception ex) { string msg = "Unable to save file {0}" + " - {1}\nWould you like to save" + " the album in an alternate file "; DialogResult result = MessageBox.Show(this, String.Format(msg, _album.FileName, ex.Message), "Save Album Error", MessageBoxButtons.YesNo, MessageBoxIcon.Error, MessageBoxDefaultButton.Button2); if (result == DialogResult.Yes) { menuSaveAs_Click(sender, e); } } . . . }

In 5, it was mentioned that C# defines a loop called foreach, but a discussion of that statement was deferred until later The time for that discussion has now come The foreach loop is used to cycle through the elements of a collection A collection is a group of objects C# defines several types of collections, of which one is an array The general form of foreach is shown here:

Catch any exception that occurs. Within the catch block, display the dialog and record the selected button.

7:

Unlike our message for the Open handler, this code makes use of the result returned by the Show method. This result is a DialogResult enumeration that indicates the button pressed. The values in this enumeration are shown in .NET Table 8.2, and correspond to the kinds of buttons typically found in Windows dialogs.

foreach(type loopvar in collection) statement; Here, type loopvar specifies the type and name of an iteration variable The iteration variable receives the value of the next element in the collection each time the foreach loop iterates The collection being cycled through is specified by collection, which, for the rest of this discussion, is an array Thus, type must be the same as (or compatible with) the element type of the array Beginning with C# 30, type can also be var, in which case the compiler determines the type based on the element type of the array This can be useful when working with certain queries, as described later in this book Normally, you will explicitly specify the type Here is how foreach works When the loop begins, the first element in the array is obtained and assigned to loopvar Each subsequent iteration obtains the next element from the array and stores it in loopvar The loop ends when there are no more elements to obtain Thus, the foreach cycles through the array one element at a time, from start to finish One important point to remember about foreach is that the iteration variable loopvar is read-only This means you can t change the contents of an array by assigning the iteration variable a new value Here is a simple example that uses foreach It creates an array of integers and gives it some initial values It then displays those values, computing the summation in the process