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.NET Framework 3.5
ListView Class
 CheckedItems Property

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Microsoft Visual Studio 2008/.NET Framework 3.5

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.NET Framework Class Library
ListView..::.CheckedItems Property

Gets the currently checked items in the control.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)
Visual Basic (Declaration)
<BrowsableAttribute(False)> _
Public ReadOnly Property CheckedItems As ListView..::.CheckedListViewItemCollection
Visual Basic (Usage)
Dim instance As ListView
Dim value As ListView..::.CheckedListViewItemCollection

value = instance.CheckedItems
C#
[BrowsableAttribute(false)]
public ListView..::.CheckedListViewItemCollection CheckedItems { get; }
Visual C++
[BrowsableAttribute(false)]
public:
property ListView..::.CheckedListViewItemCollection^ CheckedItems {
    ListView..::.CheckedListViewItemCollection^ get ();
}
JScript
public function get CheckedItems () : ListView..::.CheckedListViewItemCollection

Property Value

Type: System.Windows.Forms..::.ListView..::.CheckedListViewItemCollection
A ListView..::.CheckedListViewItemCollection that contains the currently checked items. If no items are currently checked, an empty ListView..::.CheckedListViewItemCollection is returned.

This property is only useful when the CheckBoxes property of the ListView control is set to true. The CheckedItems property returns a collection containing all items that are checked in the control. For more information on how to manipulate the items in the collection, see ListView..::.CheckedListViewItemCollection.

If you want to obtain a collection of the index positions within the ListView..::.ListViewItemCollection of the items that are checked in the ListView control, instead of the items that are checked, use the CheckedIndices property.

The following code example demonstrates a checked ListView that handles the ItemChecked event. The example uses the CheckedItems property to tally a new price each time an item is checked or unchecked. To run this example, paste the following code into a form containing a ListView named ListView1 and a TextBox named Textbox1. Call the InititalizeListView method from the form's constructor or Load method.

Visual Basic
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

C#
    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();
    }

Visual C++
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();
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
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