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ADDING HANDLERS VIA THE DESIGNER WINDOW As you might guess, Visual Studio adds a Click event handler whenever you doubleclick a menu control in the Windows Forms Designer. We already saw this behavior for buttons in chapter 2. Let s use this feature to add a handler to the Load menu here.

Part II:

Method public virtual Array ToArray(Type type)

Set the version number of the application to 3.3. ADD CLICK HANDLER FOR THE LOAD MENU Action 1 2 Display the MainForm.cs [Design] window. Add a Click handler for the Load menu

Description Returns an array that contains copies of the elements of the invoking object The type of the elements in the array are specified by type Sets Capacity to Count

3:

A new event handler for the Load menu is added and the cursor is placed in the MainForm.cs code window within the newly added handler.

public virtual void TrimToSize( )

TABLE 24-4 Several Commonly Used Methods De ned by ArrayList (continued)

protected void menuLoad_Click(object sender, System.EventArgs e) { }

In addition to those properties defined by the interfaces that it implements, ArrayList adds Capacity, shown here: public virtual int Capacity { get; set; } Capacity gets or sets the capacity of the invoking ArrayList The capacity is the number of elements that can be held before the ArrayList must be enlarged As mentioned, an ArrayList grows automatically, so it is not necessary to set the capacity manually However, for efficiency reasons, you might want to set the capacity when you know in advance how many elements the list will contain This prevents the overhead associated with the allocation of more memory Conversely, if you want to reduce the size of the array that underlies an ArrayList, you can set Capacity to a smaller value However, this value must not be less than Count Recall that Count is a property defined by ICollection that holds the number of objects currently stored in a collection Attempting to set Capacity to a value less than Count causes an ArgumentOutOfRangeException to be generated To obtain an ArrayList that is precisely as large as the number of items that it is currently holding, set Capacity equal to Count You can also call TrimToSize( ) The following program demonstrates ArrayList It creates an ArrayList and then adds characters to it The list is then displayed Some of the elements are removed, and the list is displayed again Next, more elements are added, forcing the capacity of the list to be increased Finally, the contents of elements are changed

The new handler is also registered as a Click handler for the Note: This double-click Load menu in the InitializeComponent method. method only works for the menuLoad.Click += new System.EventHandler Click event. We will see (this.menuLoad_Click); how to add events more generally in the next section.

// Demonstrate ArrayList using System; using SystemCollections; class ArrayListDemo { static void Main() { // Create an array list ArrayList al = new ArrayList(); ConsoleWriteLine("Initial number of elements: " + alCount); ConsoleWriteLine(); ConsoleWriteLine("Adding 6 elements"); // Add elements to the array list alAdd('C');

24:

ADD CLICK HANDLER FOR THE LOAD MENU (continued) 3 Copy the code from the now defunct btnLoad_ Click into our new method and delete the old method. Note: Unless you removed it, the code for btnLoad_Click should still be present in your code. After copying this code, remove the method. This code is identical to the code used with our Load button in chapter 2; it is just invoked via a menu rather than a button.

ConsoleWriteLine(y + " "); } ConsoleWriteLine(); x = 1; ConsoleWriteLine("Series generated using y = x + ++x;"); for(i = 0; i < 10; i++) { y = x + ++x; // prefix ++ ConsoleWriteLine(y + " "); } ConsoleWriteLine(); } }

protected void menuLoad_Click (object sender, System.EventArgs e) { OpenFileDialog dlg = new OpenFileDialog(); dlg.Title = "Load Photo"; dlg.Filter = "jpg files (*.jpg)" + "|*.jpg|All files (*.*)|*.*"; if (dlg.ShowDialog() == DialogResult.OK) { try { pbxPhoto.Image = new Bitmap(dlg.OpenFile()); } catch (Exception ex) { MessageBox.Show( "Unable to load file: " + ex.Message); } } dlg.Dispose(); }

The output is shown here:

Series generated using y = x + x++; 2 4 6 8 10 12 14 16 18 20 Series generated using y = x + ++x; 3 5 7 9 11 13 15 17 19 21