ListView.CheckedItems プロパティ

.NET Framework クラス ライブラリ リファレンス

ListView.CheckedItems プロパティ

コントロールの現在チェックされている項目を取得します。

名前空間: System.Windows.Forms
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)
構文

Visual Basic (宣言)

Public ReadOnly Property
 CheckedItems As CheckedListViewItemCollection

Visual Basic (使用法)

Dim instance As ListView
Dim value As CheckedListViewItemCollection

value = instance.CheckedItems

C#

public CheckedListViewItemCollection CheckedItems { get;
 }

C++

public:
property CheckedListViewItemCollection^ CheckedItems {
    CheckedListViewItemCollection^ get ();
}

J#

/** @property */
public CheckedListViewItemCollection get_CheckedItems ()

JScript

public function get CheckedItems
 () : CheckedListViewItemCollection

プロパティ値
現在チェックされている項目を含んでいる ListView.CheckedListViewItemCollection。項目が現在チェックされていない場合は、空の ListView.CheckedListViewItemCollection が返されます。

解説

このプロパティは、ListView コントロールの CheckBoxes プロパティが true に設定されている場合にだけ有効です。CheckedItems プロパティは、コントロールでチェックされているすべての項目を含むコレクションを返します。コレクション内の項目を操作する方法については、ListView.CheckedListViewItemCollection のトピックを参照してください。

チェックされている項目ではなく、ListView コントロールでチェックされている項目の ListView.ListViewItemCollection 内のインデックス位置のコレクションを取得する場合は、CheckedIndices プロパティを使用します。

使用例

チェックされている ListView が ItemChecked イベントを処理するようすを次のコード例に示します。この例では、CheckedItems プロパティを使用して、項目のチェック ボックスをオンまたはオフにするたびに新しい価格を合計しています。この例を実行するには、ListView1 という名前の ListView と、Textbox1 という名前の TextBox を含むフォームに次のコードを貼り付けます。そして、フォームのコンストラクタまたはLoad メソッドから InititalizeListView メソッドを呼び出します。

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
<br /><span space="preserve">...</span><br
 />    ' 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);
    }
<br /><span space="preserve">...</span><br /> 
   // 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();
    }

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
 );
   }
<br /><span space="preserve">...</span><br /> 
  // 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();
   }

J#

    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
<br /><span space="preserve">...</span><br /> 
   // 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

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

関連項目
ListView クラス
ListView メンバ
System.Windows.Forms 名前空間
ListView.CheckedListViewItemCollection
ListView.CheckedIndices プロパティ