ListView.SelectedIndices プロパティとは? わかりやすく解説

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ListView.SelectedIndices プロパティ

コントロール内の選択された項目のインデックス取得します

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

Public ReadOnly Property
 SelectedIndices As SelectedIndexCollection
Dim instance As ListView
Dim value As SelectedIndexCollection

value = instance.SelectedIndices
public SelectedIndexCollection SelectedIndices { get;
 }
public:
property SelectedIndexCollection^ SelectedIndices {
    SelectedIndexCollection^ get ();
}
/** @property */
public SelectedIndexCollection get_SelectedIndices ()
public function get SelectedIndices
 () : SelectedIndexCollection

プロパティ
選択された項目のインデックス格納している ListView.SelectedIndexCollection。項目が現在選択されていない場合は、空の ListView.SelectedIndexCollection返されます。

解説解説
使用例使用例

SelectedIndices、SelectedIndexChanged、および HeaderStyle の各メンバListView.SelectedIndexCollection クラス使用するコード例次に示します。この例を実行するには、ListView1 という名前の ListView オブジェクトTextBox1 という名前の TextBox配置されているフォーム次のコード貼り付けます。そして、フォームコンストラクタまたはLoad メソッドから InitializeListView メソッド呼び出します。この例では、イベント ハンドラ正しく SelectedIndexChanged イベント関連付けられている必要があります

    ' This method adds two columns to the ListView, setting the Text 
    ' and TextAlign, and Width properties of each ColumnHeader.  The
 
    ' HeaderStyle property is set to NonClickable since the ColumnClick
 
    ' event is not handled.  Finally the method adds ListViewItems and
 
    ' SubItems to each column.
    Private Sub InitializeListView()
        Me.ListView1 = New System.Windows.Forms.ListView
        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.Name = "ListView1"
        Me.ListView1.Size = New System.Drawing.Size(292,
 130)
        Me.ListView1.TabIndex = 0
        Me.ListView1.View = System.Windows.Forms.View.Details
        Me.ListView1.MultiSelect = True
        Me.ListView1.HideSelection = False
        ListView1.HeaderStyle = ColumnHeaderStyle.Nonclickable
        Dim columnHeader1 As New
 ColumnHeader
        With columnHeader1
            .Text = "Breakfast Item"
            .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", "2.49",
 "1.49", "1.49"}
        Dim count As Integer
        For count = 0 To foodList.Length -
 1
            Dim listItem As New
 ListViewItem(foodList(count))
            listItem.SubItems.Add(foodPrice(count))
            ListView1.Items.Add(listItem)
        Next
        Me.Controls.Add(Me.ListView1)
    End Sub
<br /><span space="preserve">...</span><br
 />    ' Uses the SelectedIndices property to retrieve and tally
 the price of  
    ' the selected menu items.
    Private Sub ListView1_SelectedIndexChanged_UsingIndices
 _
        (ByVal sender As Object,
 ByVal e As System.EventArgs) _
        Handles ListView1.SelectedIndexChanged

        Dim indexes As ListView.SelectedIndexCollection
 = _
            Me.ListView1.SelectedIndices
        Dim index As Integer
        Dim price As Double
 = 0.0
        For Each index In
 indexes
            price += Double.Parse(Me.ListView1.Items(index).SubItems(1).Text)
        Next

        ' Output the price to TextBox1.
        TextBox1.Text = CType(price, String)
    End Sub
    // This method adds two columns to the ListView, setting the Text 
    // and TextAlign, and Width properties of each ColumnHeader.  The
 
    // HeaderStyle property is set to NonClickable since the ColumnClick
 
    // event is not handled.  Finally the method adds ListViewItems
 and 
    // SubItems to each column.
    private void InitializeListView()
    {
        this.ListView1 = new System.Windows.Forms.ListView();
        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.Name = "ListView1";
        this.ListView1.Size = new System.Drawing.Size(292,
 130);
        this.ListView1.TabIndex = 0;
        this.ListView1.View = System.Windows.Forms.View.Details;
        this.ListView1.MultiSelect = true;
        this.ListView1.HideSelection = false;
        this.ListView1.HeaderStyle = ColumnHeaderStyle.Nonclickable;
        
        ColumnHeader columnHeader1 = new ColumnHeader();
        columnHeader1.Text = "Breakfast Item";
        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", 
            "2.49", "1.49", "1.49"};
        
        for(int count=0; count < foodList.Length;
 count++)
        {
            ListViewItem listItem = new ListViewItem(foodList[count]);
            listItem.SubItems.Add(foodPrice[count]);
            ListView1.Items.Add(listItem);
        }
        this.Controls.Add(ListView1);
    }
    
<br /><span space="preserve">...</span><br /> 
   // Uses the SelectedIndices property to retrieve and tally the 
 
    // price of the selected menu items.
    private void ListView1_SelectedIndexChanged_UsingIndices(
        object sender, System.EventArgs e)
    {

        ListView.SelectedIndexCollection indexes = 
            this.ListView1.SelectedIndices;
        
        double price = 0.0;
        foreach ( int index in
 indexes )
        {
            price += Double.Parse(
                this.ListView1.Items[index].SubItems[1].Text);
        }

        // Output the price to TextBox1.
        TextBox1.Text =  price.ToString();
    }
   // This method adds two columns to the ListView, setting the Text 
   // and TextAlign, and Width properties of each ColumnHeader.  The
 
   // HeaderStyle property is set to NonClickable since the ColumnClick
 
   // event is not handled.  Finally the method adds ListViewItems and
 
   // SubItems to each column.
   void InitializeListView()
   {
      this->ListView1 = gcnew System::Windows::Forms::ListView;
      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->Name = "ListView1";
      this->ListView1->Size = System::Drawing::Size( 292,
 130 );
      this->ListView1->TabIndex = 0;
      this->ListView1->View = System::Windows::Forms::View::Details;
      this->ListView1->MultiSelect = true;
      this->ListView1->HideSelection = false;
      this->ListView1->HeaderStyle = ColumnHeaderStyle::Nonclickable;
      ColumnHeader^ columnHeader1 = gcnew ColumnHeader;
      columnHeader1->Text = "Breakfast Item";
      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"
,"2.49","1.49","1.49"};
      for ( int count = 0; count < foodList->Length;
 count++ )
      {
         ListViewItem^ listItem = gcnew ListViewItem( foodList[ count ] );
         listItem->SubItems->Add( foodPrice[ count ] );
         ListView1->Items->Add( listItem );

      }
      this->Controls->Add( ListView1 );
   }
<br /><span space="preserve">...</span><br /> 
  // Uses the SelectedIndices property to retrieve and tally the  
   // price of the selected menu items.
   void ListView1_SelectedIndexChanged_UsingIndices( Object^ /*sender*/,
 System::EventArgs^ /*e*/ )
   {
      ListView::SelectedIndexCollection^ indexes = this->ListView1->SelectedIndices;
      double price = 0.0;
      System::Collections::IEnumerator^ myEnum1 = indexes->GetEnumerator();
      while ( myEnum1->MoveNext() )
      {
         int index = safe_cast<int>(myEnum1->Current);
         price += Double::Parse( this->ListView1->Items[
 index ]->SubItems[ 1 ]->Text );
      }

      
      // Output the price to TextBox1.
      TextBox1->Text = price.ToString();
   }
    // This method adds two columns to the ListView, setting the Text 
    // and TextAlign, and Width properties of each ColumnHeader.  The
 
    // HeaderStyle property is set to NonClickable since the ColumnClick
 
    // event is not handled.  Finally the method adds ListViewItems
 and 
    // SubItems to each column.
    private void InitializeListView()
    {
        this.listView1 = new System.Windows.Forms.ListView();
        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_Name("listView1");
        this.listView1.set_Size(new System.Drawing.Size(292,
 130));
        this.listView1.set_TabIndex(0);
        this.listView1.set_View(System.Windows.Forms.View.Details);
        this.listView1.set_MultiSelect(true);
        this.listView1.set_HideSelection(false);
        this.listView1.set_HeaderStyle(ColumnHeaderStyle.Nonclickable);

        ColumnHeader columnHeader1 = new ColumnHeader();
        columnHeader1.set_Text("Breakfast Item");
        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", "2.49",
            "1.49", "1.49" };

        for (int count = 0; count < foodList.get_Length();
 count++) {
            ListViewItem listItem = new ListViewItem(
                foodList.get_Item(count).ToString());
            listItem.get_SubItems().Add(foodPrice.get_Item(count).ToString());
            listView1.get_Items().Add(listItem);
        }
        this.get_Controls().Add(listView1);
    } //InitializeListView
<br /><span space="preserve">...</span><br /> 
   // Uses the SelectedIndices property to retrieve and tally the 
 
    // price of the selected menu items.
    private void listView1_SelectedIndexChanged_UsingIndices(Object
 sender, 
        System.EventArgs e)
    {
        ListView.SelectedIndexCollection indexes = 
            this.listView1.get_SelectedIndices();

        double price = 0.0;
        for (int iCtr = 0; iCtr < indexes.get_Count();
 iCtr++) {
            int index = indexes.get_Item(iCtr);
            price += System.Double.Parse(this.listView1.get_Items().
                get_Item(index).get_SubItems().get_Item(1).get_Text());
        }
        // Output the price to textBox1.
        textBox1.set_Text(System.Convert.ToString(price));
    } //listView1_SelectedIndexChanged_UsingIndices
プラットフォームプラットフォーム
バージョン情報バージョン情報
参照参照
関連項目
ListView クラス
ListView メンバ
System.Windows.Forms 名前空間
ListView.SelectedIndexCollection
SelectedItems


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