Proprietà ListView.CheckedItems (System.Windows.Forms)

    Private Sub InitializeListView()
        Me.ListView1 = New System.Windows.Forms.ListView

        ' Set properties such as BackColor, Location and Size
        Me.ListView1.BackColor = System.Drawing.SystemColors.Control
        Me.ListView1.Dock = System.Windows.Forms.DockStyle.Top
        Me.ListView1.Location = New System.Drawing.Point(0, 0)
        Me.ListView1.Size = New System.Drawing.Size(292, 130)
        Me.ListView1.View = System.Windows.Forms.View.Details
        Me.ListView1.HideSelection = False

        ' Allow user to select multiple items.
        Me.ListView1.MultiSelect = True

        ' Show check boxes in the ListView.
        Me.ListView1.CheckBoxes = True

        'Set the column headers and populate the columns.
        ListView1.HeaderStyle = ColumnHeaderStyle.Nonclickable
        Dim columnHeader1 As New ColumnHeader
        With columnHeader1
            .Text = "Breakfast Choices"
            .TextAlign = HorizontalAlignment.Left
            .Width = 146
        End With
        Dim columnHeader2 As New ColumnHeader
        With columnHeader2
            .Text = "Price Each"
            .TextAlign = HorizontalAlignment.Center
            .Width = 142
        End With
        Me.ListView1.Columns.Add(columnHeader1)
        Me.ListView1.Columns.Add(columnHeader2)
        Dim foodList() As String = New String() {"Juice", "Coffee", _
            "Cereal & Milk", "Fruit Plate", "Toast & Jelly", _
            "Bagel & Cream Cheese"}

        Dim foodPrice() As String = New String() {"1.09", "1.09", "2.19", _
            "2.79", "2.09", "2.69"}
        Dim count As Integer

        ' Members are added one at a time, so call BeginUpdate to ensure 
        ' the list is painted only once, rather than as each list item is added.
        ListView1.BeginUpdate()

        For count = 0 To foodList.Length - 1
            Dim listItem As New ListViewItem(foodList(count))
            listItem.SubItems.Add(foodPrice(count))
            ListView1.Items.Add(listItem)
        Next

        'Call EndUpdate when you finish adding items to the ListView.
        ListView1.EndUpdate()
        Me.Controls.Add(Me.ListView1)
    End Sub
...    ' Handles the ItemCheck event.  The method loops through all the 
    ' checked items and tallies a new price each time an item is 
    ' checked or unchecked. It outputs the price to TextBox1.
    Private Sub ListView1_ItemCheck2(ByVal sender As Object, _
        ByVal e As System.Windows.Forms.ItemCheckEventArgs) _
        Handles ListView1.ItemCheck

        Dim item As ListViewItem
        Dim price As Double = 0.0
        Dim checkedItems As ListView.CheckedListViewItemCollection = _
            ListView1.CheckedItems
        For Each item In checkedItems
            price += Double.Parse(item.SubItems(1).Text)
        Next
        If (e.CurrentValue = CheckState.Unchecked) Then
            price += Double.Parse(Me.ListView1.Items(e.Index).SubItems(1).Text)
        ElseIf (e.CurrentValue = CheckState.Checked) Then
            price -= Double.Parse(Me.ListView1.Items(e.Index).SubItems(1).Text)
        End If

        ' Output the price to TextBox1.
        TextBox1.Text = CType(price, String)
    End Sub

	private void InitializeListView()
	{
		this.ListView1 = new System.Windows.Forms.ListView();

		// Set properties such as BackColor and DockStyle and Location.
		this.ListView1.BackColor = System.Drawing.SystemColors.Control;
		this.ListView1.Dock = System.Windows.Forms.DockStyle.Top;
		this.ListView1.Location = new System.Drawing.Point(0, 0);
		this.ListView1.Size = new System.Drawing.Size(292, 130);
		this.ListView1.View = System.Windows.Forms.View.Details;
		this.ListView1.HideSelection = false;

		// Allow the user to select multiple items.
		this.ListView1.MultiSelect = true;

		// Show CheckBoxes in the ListView.
		this.ListView1.CheckBoxes = true;
		
		//Set the column headers and populate the columns.
		ListView1.HeaderStyle = ColumnHeaderStyle.Nonclickable;
		
		ColumnHeader columnHeader1 = new ColumnHeader();
		columnHeader1.Text = "Breakfast Choices";
		columnHeader1.TextAlign = HorizontalAlignment.Left;
		columnHeader1.Width = 146;

		ColumnHeader columnHeader2 = new ColumnHeader();
		columnHeader2.Text = "Price Each";
		columnHeader2.TextAlign = HorizontalAlignment.Center;
		columnHeader2.Width = 142;

       	this.ListView1.Columns.Add(columnHeader1);
		this.ListView1.Columns.Add(columnHeader2);

		string[] foodList = new string[]{"Juice", "Coffee", 
			"Cereal & Milk", "Fruit Plate", "Toast & Jelly", 
			"Bagel & Cream Cheese"};

		string[] foodPrice = new string[]{"1.09", "1.09", "2.19", 
			"2.79", "2.09", "2.69"};
		
		int count;

		// Members are added one at a time, so call BeginUpdate to ensure 
		// the list is painted only once, rather than as each list item is added.
		ListView1.BeginUpdate();

		for(count = 0; count < foodList.Length; count++)
		{
			ListViewItem listItem = new ListViewItem(foodList[count]);
			listItem.SubItems.Add(foodPrice[count]);
			ListView1.Items.Add(listItem);
		}

		//Call EndUpdate when you finish adding items to the ListView.
		ListView1.EndUpdate();
		this.Controls.Add(this.ListView1);
	}
...	// Handles the ItemChecked event.  The method loops through all the 
	// checked items and tallies a new price each time an item is 
	// checked or unchecked. It outputs the price to TextBox1.
	private void ListView1_ItemCheck2(object sender, 
		System.Windows.Forms.ItemCheckEventArgs e)
	{
		double price = 0.0;
		ListView.CheckedListViewItemCollection checkedItems = 
			ListView1.CheckedItems;
		
		foreach ( ListViewItem item in checkedItems )
		{
			price += Double.Parse(item.SubItems[1].Text);
		}
		if (e.CurrentValue==CheckState.Unchecked)
		{
			price += Double.Parse(
				this.ListView1.Items[e.Index].SubItems[1].Text);
		}
		else if((e.CurrentValue==CheckState.Checked))
		{
			price -= Double.Parse(
				this.ListView1.Items[e.Index].SubItems[1].Text);
		}
		// Output the price to TextBox1.
		TextBox1.Text = price.ToString();
	}

   void InitializeListView()
   {
      this->ListView1 = gcnew System::Windows::Forms::ListView;
      
      // Set properties such as BackColor and DockStyle and Location.
      this->ListView1->BackColor = System::Drawing::SystemColors::Control;
      this->ListView1->Dock = System::Windows::Forms::DockStyle::Top;
      this->ListView1->Location = System::Drawing::Point( 0, 0 );
      this->ListView1->Size = System::Drawing::Size( 292, 130 );
      this->ListView1->View = System::Windows::Forms::View::Details;
      this->ListView1->HideSelection = false;
      
      // Allow the user to select multiple items.
      this->ListView1->MultiSelect = true;
      
      // Show CheckBoxes in the ListView.
      this->ListView1->CheckBoxes = true;
      
      //Set the column headers and populate the columns.
      ListView1->HeaderStyle = ColumnHeaderStyle::Nonclickable;
      ColumnHeader^ columnHeader1 = gcnew ColumnHeader;
      columnHeader1->Text = "Breakfast Choices";
      columnHeader1->TextAlign = HorizontalAlignment::Left;
      columnHeader1->Width = 146;
      ColumnHeader^ columnHeader2 = gcnew ColumnHeader;
      columnHeader2->Text = "Price Each";
      columnHeader2->TextAlign = HorizontalAlignment::Center;
      columnHeader2->Width = 142;
      this->ListView1->Columns->Add( columnHeader1 );
      this->ListView1->Columns->Add( columnHeader2 );
      array<String^>^foodList = {"Juice","Coffee","Cereal & Milk","Fruit Plate","Toast & Jelly","Bagel & Cream Cheese"};
      array<String^>^foodPrice = {"1.09","1.09","2.19","2.79","2.09","2.69"};
      int count;
      
      // Members are added one at a time, so call BeginUpdate to ensure 
      // the list is painted only once, rather than as each list item is added.
      ListView1->BeginUpdate();
      for ( count = 0; count < foodList->Length; count++ )
      {
         ListViewItem^ listItem = gcnew ListViewItem( foodList[ count ] );
         listItem->SubItems->Add( foodPrice[ count ] );
         ListView1->Items->Add( listItem );
      }
      
      //Call EndUpdate when you finish adding items to the ListView.
      ListView1->EndUpdate();
      this->Controls->Add( this->ListView1 );
   }
...   // Handles the ItemChecked event.  The method loops through all the 
   // checked items and tallies a new price each time an item is 
   // checked or unchecked. It outputs the price to TextBox1.
   void ListView1_ItemCheck2( Object^ /*sender*/, System::Windows::Forms::ItemCheckEventArgs^ e )
   {
      double price = 0.0;
      ListView::CheckedListViewItemCollection^ checkedItems = ListView1->CheckedItems;
      System::Collections::IEnumerator^ myEnum = checkedItems->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         ListViewItem^ item = safe_cast<ListViewItem^>(myEnum->Current);
         price += Double::Parse( item->SubItems[ 1 ]->Text );
      }

      if ( e->CurrentValue == CheckState::Unchecked )
      {
         price += Double::Parse( this->ListView1->Items[ e->Index ]->SubItems[ 1 ]->Text );
      }
      else
      if ( (e->CurrentValue == CheckState::Checked) )
      {
         price -= Double::Parse( this->ListView1->Items[ e->Index ]->SubItems[ 1 ]->Text );
      }

      // Output the price to TextBox1.
      TextBox1->Text = price.ToString();
   }

    private void InitializeListView()
    {
        this.listView1 = new System.Windows.Forms.ListView();
        // Set properties such as BackColor and DockStyle and Location.
        this.listView1.set_BackColor(System.Drawing.SystemColors.get_Control());
        this.listView1.set_Dock(System.Windows.Forms.DockStyle.Top);
        this.listView1.set_Location(new System.Drawing.Point(0, 0));
        this.listView1.set_Size(new System.Drawing.Size(292, 130));
        this.listView1.set_View(System.Windows.Forms.View.Details);
        this.listView1.set_HideSelection(false);
        // Allow the user to select multiple items.
        this.listView1.set_MultiSelect(true);
        // Show CheckBoxes in the ListView.
        this.listView1.set_CheckBoxes(true);
        //Set the column headers and populate the columns.
        listView1.set_HeaderStyle(ColumnHeaderStyle.Nonclickable);

        ColumnHeader columnHeader1 = new ColumnHeader();
        columnHeader1.set_Text("Breakfast Choices");
        columnHeader1.set_TextAlign(HorizontalAlignment.Left);
        columnHeader1.set_Width(146);

        ColumnHeader columnHeader2 = new ColumnHeader();
        columnHeader2.set_Text("Price Each");
        columnHeader2.set_TextAlign(HorizontalAlignment.Center);
        columnHeader2.set_Width(142);

        this.listView1.get_Columns().Add(columnHeader1);
        this.listView1.get_Columns().Add(columnHeader2);

        String foodList[] = new String[] { "Juice", "Coffee", "Cereal & Milk",
            "Fruit Plate", "Toast & Jelly", "Bagel & Cream Cheese" };

        String foodPrice[] = new String[] { "1.09", "1.09", "2.19", "2.79",
            "2.09", "2.69" };

        int count;
        // Members are added one at a time, so call BeginUpdate to ensure 
        // the list is painted only once, rather than as each list item is added.
        listView1.BeginUpdate();

        for (count = 0; count < foodList.length; count++) {
            ListViewItem listItem =
                new ListViewItem((String)foodList.get_Item(count));
            listItem.get_SubItems().Add((String)foodPrice.get_Item(count));
            listView1.get_Items().Add(listItem);
        }
        //Call EndUpdate when you finish adding items to the ListView.
        listView1.EndUpdate();
        this.get_Controls().Add(this.listView1);
    } //InitializeListView
...    // Handles the ItemChecked event.  The method loops through all the 
    // checked items and tallies a new price each time an item is 
    // checked or unchecked. It outputs the price to TextBox1.
    private void listView1_ItemCheck2(Object sender,
        System.Windows.Forms.ItemCheckEventArgs e)
    {
        double price = 0.0;
        ListView.CheckedListViewItemCollection checkedItems =
            listView1.get_CheckedItems();
        for (int iCtr = 0; iCtr < checkedItems.get_Count(); iCtr++) {
            ListViewItem item = checkedItems.get_Item(iCtr);
            price +=
                System.Double.Parse(item.get_SubItems().get_Item(1).get_Text());
        }
        if (e.get_CurrentValue().Equals(CheckState.Unchecked)) {
            price += System.Double.Parse(this.listView1.get_Items().
                get_Item(e.get_Index()).get_SubItems().get_Item(1).
                get_Text());
        }
        else {
            if (e.get_CurrentValue().Equals(CheckState.Checked)) {
                price -= System.Double.Parse(this.listView1.get_Items().
                    get_Item(e.get_Index()).get_SubItems().get_Item(1).
                    get_Text());
            }
        }
        // Output the price to TextBox1.
        textBox1.set_Text(((System.Double)price).ToString());
    } //listView1_ItemCheck2