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// Use is to avoid an invalid cast using System; class A {} class B : A {} class CheckCast { static void Main() { A a = new A(); B b = new B(); // Check to see if a can be cast to B if(a is B) // if so, do the cast b = (B) a; else // if not, skip the cast b = null; if(b==null) ConsoleWriteLine("The cast in b = (B) a is NOT allowed"); else ConsoleWriteLine("The cast in b = (B) a is allowed"); } }

This program displays the following output:

ADD A MENU TO DISPLAY ALBUM PROPERTIES (continued) Action 7 Display an error message if the album could not be opened. Note: Here and throughout the remainder of the book, we use the simplest form of the MessageBox dialog. Feel free to use an alternate form if you prefer. See chapter 8 for detailed information on the MessageBox class. 8 Display the AlbumEditDlg if the album is opened successfully. If any changes are made by the user, save these changes into the album file. Catch any errors that occur. Result

As the output shows, since a is not a B, the cast of a to B is invalid and is prevented by the if statement However, this approach requires two steps First, the validity of the cast must be confirmed Second, the cast must be made These two steps can be combined into one through the use of as, as the following program shows:

if (album == null) { MessageBox.Show("The properties for " + "this album cannot be displayed."); return; }

// Demonstrate as using System; class A {} class B : A {} class CheckCast { static void Main() { A a = new A(); B b = new B(); b = a as B; // cast, if possible

Part I:

using (AlbumEditDlg dlg = new AlbumEditDlg(album)) { if (dlg.ShowDialog() == DialogResult.OK) { // Save changes made by the user try { album.Save(); } catch (Exception) { MessageBox.Show("Unable to save " + "changes to album."); return; } // Update subitem settings item.SubItems[MainForm. AlbumTitleColumn].Text = album.Title; bool hasPwd = (album.Password != null) && (album.Password.Length > 0); item.SubItems[MainForm. AlbumPwdColumn].Text = (hasPwd "y" : "n"); } }

tailgate as shown in Figure 10-39 It makes a world of difference Be sure to carry plenty of literature because people will talk to you whether moving (neighborhood or freeway) or stopped (with the hood up or down) While you can draw a crowd whenever you visit the local convenience store and certainly will at a gas station you can really impress your date while waving to the folks on the freeway as you pass them at 75 mph and watch their mouths drop open

if(b==null) ConsoleWriteLine("The cast in b = (B) a is NOT allowed"); else ConsoleWriteLine("The cast in b = (B) a is allowed"); } }

album.Dispose(); }

Here is the output, which is the same as before:

In this version, the as statement checks the validity of the cast and then, if valid, performs the cast, all in one statement

We employ the using statement to ensure that our dialog is properly disposed of at the end of the handler. Also note how multiple exceptional handling blocks are used to catch errors that occur. You may wonder if it is expensive to perform such operations, especially if you are familiar with exception-handling mechanisms in languages like C and C++ where it indeed can be an expensive proposition to call try multiple times. In C#, the exception handling is built into the language and the compiler, so checking for exceptions as we do here is not much more expensive than an if statement. The expense comes if an exception actually occurs, since the compiler must