ComboBox.SelectedIndexChanged (Evento)

public event EventHandler SelectedIndexChanged

/** @event */
public void add_SelectedIndexChanged (EventHandler value)

/** @event */
public void remove_SelectedIndexChanged (EventHandler value)

En JScript, se pueden controlar los eventos que define una clase, pero no se pueden definir unos propios.

No aplicable.

	// Declare comboBox1 as a ComboBox.
	internal System.Windows.Forms.ComboBox ComboBox1;
    
	// This method initializes the combo box, adding a large string array
	// but limiting the drop-down size to six rows so the combo box doesn't 
	// cover other controls when it expands.
	private void InitializeComboBox()
	{
		this.ComboBox1 = new System.Windows.Forms.ComboBox();
		string[] employees = new string[]{"Hamilton, David", "Hensien, Kari",
				"Hammond, Maria", "Harris, Keith", "Henshaw, Jeff D.", 
				"Hanson, Mark", "Harnpadoungsataya, Sariya", 
				"Harrington, Mark", "Harris, Keith", "Hartwig, Doris", 
				"Harui, Roger", "Hassall, Mark", "Hasselberg, Jonas", 
				"Harnpadoungsataya, Sariya", "Henshaw, Jeff D.", 
				"Henshaw, Jeff D.", "Hensien, Kari", "Harris, Keith", 
				"Henshaw, Jeff D.", "Hensien, Kari", "Hasselberg, Jonas",
				"Harrington, Mark", "Hedlund, Magnus", "Hay, Jeff", 
				"Heidepriem, Brandon D."};

		ComboBox1.Items.AddRange(employees);
		this.ComboBox1.Location = new System.Drawing.Point(136, 32);
		this.ComboBox1.MaxDropDownItems = 5;
		this.ComboBox1.DropDownStyle = ComboBoxStyle.DropDownList;
		this.ComboBox1.Name = "ComboBox1";
		this.ComboBox1.Size = new System.Drawing.Size(136, 81);
		this.ComboBox1.TabIndex = 0;
		this.Controls.Add(this.ComboBox1);
		
		// Associate the event-handling method with the 
		// SelectedIndexChanged event.
		this.ComboBox1.SelectedIndexChanged += 
			new System.EventHandler(ComboBox1_SelectedIndexChanged);
	}
...

	// This method is called when the user changes his or her selection.
	// It searches for all occurrences of the selected employee's
	// name in the Items array and adds the employee's name and 
	// the number of occurrences to TextBox1.Text.

	// CAUTION   This code exposes a known bug: If the index passed to the 
	// FindStringExact(searchString, index) method is the last index 
	// of the array, the code throws an exception.
	private void ComboBox1_SelectedIndexChanged(object sender, 
		System.EventArgs e)
	{

		ComboBox comboBox = (ComboBox) sender;

		// Save the selected employee's name, because we will remove
		// the employee's name from the list.
		string selectedEmployee = (string) ComboBox1.SelectedItem;

		int count = 0;
		int resultIndex = -1;

		// Call the FindStringExact method to find the first 
		// occurrence in the list.
		resultIndex = ComboBox1.FindStringExact(selectedEmployee);

		// Remove the name as it is found, and increment the found count. 
		// Then call the FindStringExact method again, passing in the 
		// index of the current found item so the search starts there 
		// instead of at the beginning of the list.
		while (resultIndex!=-1)
		{
			ComboBox1.Items.RemoveAt(resultIndex);
			count += 1;
			resultIndex = ComboBox1.FindStringExact(selectedEmployee, 
				resultIndex);
		}
		// Update the text in Textbox1.
		TextBox1.Text = TextBox1.Text+ "\r\n" + selectedEmployee + ": "
			+ count;
	}

    // Declare comboBox1 as a ComboBox.
    System.Windows.Forms.ComboBox comboBox1;

    // This method initializes the combo box, adding a large string array
    // but limiting the drop-down size to six rows so the combo box doesn't 
    // cover other controls when it expands.
    private void InitializeComboBox()
    {
        this.comboBox1 = new System.Windows.Forms.ComboBox();
        String employees[] = new String[] { "Hamilton, David", "Hensien, Kari", 
            "Hammond, Maria", "Harris, Keith", "Henshaw, Jeff D.", 
            "Hanson, Mark", "Harnpadoungsataya, Sariya", "Harrington, Mark",
            "Harris, Keith", "Hartwig, Doris", "Harui, Roger", "Hassall, Mark",
            "Hasselberg, Jonas", "Harnpadoungsataya, Sariya", 
            "Henshaw, Jeff D.","Henshaw, Jeff D.", "Hensien, Kari", 
            "Harris, Keith", "Henshaw, Jeff D.", "Hensien, Kari", 
            "Hasselberg, Jonas", "Harrington, Mark", "Hedlund, Magnus", 
            "Hay, Jeff", "Heidepriem, Brandon D." };

        comboBox1.get_Items().AddRange(employees);
        this.comboBox1.set_Location(new System.Drawing.Point(136, 32));
        this.comboBox1.set_MaxDropDownItems(5);
        this.comboBox1.set_DropDownStyle(ComboBoxStyle.DropDownList);
        this.comboBox1.set_Name("comboBox1");
        this.comboBox1.set_Size(new System.Drawing.Size(136, 81));
        this.comboBox1.set_TabIndex(0);
        this.get_Controls().Add(this.comboBox1);
        // Associate the event-handling method with the 
        // SelectedIndexChanged event.
        this.comboBox1.add_SelectedIndexChanged(new System.EventHandler(
            comboBox1_SelectedIndexChanged));
    } //InitializeComboBox
...

    // This method is called when the user changes his or her selection.
    // It searches for all occurrences of the selected employee's
    // name in the Items array and adds the employee's name and 
    // the number of occurrences to textBox1.Text.
    // CAUTION   This code exposes a known bug: If the index passed to the 
    // FindStringExact(searchString, index) method is the last index 
    // of the array, the code throws an exception.
    private void comboBox1_SelectedIndexChanged(Object sender, 
        System.EventArgs e)
    {
        ComboBox comboBox = (ComboBox)sender;
        // Save the selected employee's name, because we will remove
        // the employee's name from the list.
        String selectedEmployee = (String)(comboBox1.get_SelectedItem());

        int count = 0;
        int resultIndex = -1;
        // Call the FindStringExact method to find the first 
        // occurrence in the list.
        resultIndex = comboBox1.FindStringExact(selectedEmployee);
        // Remove the name as it is found, and increment the found count. 
        // Then call the FindStringExact method again, passing in the 
        // index of the current found item so the search starts there 
        // instead of at the beginning of the list.
        while (resultIndex != -1) {
            comboBox1.get_Items().RemoveAt(resultIndex);
            count += 1;
            resultIndex = comboBox1.FindStringExact(selectedEmployee, 
                resultIndex);
        }
        // Update the text in textBox1.
        textBox1.set_Text(textBox1.get_Text() + "\r\n" + selectedEmployee 
            + ": " + count);
    } //comboBox1_SelectedIndexChanged