ListView.SelectedIndexChanged イベントとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

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ListView.SelectedIndexChanged イベント

リストビューコントロール内の選択された項目のインデックスが変更された場合に発生します。

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 Event SelectedIndexChanged As
 EventHandler

Visual Basic (使用法)

Dim instance As ListView
Dim handler As EventHandler

AddHandler instance.SelectedIndexChanged, handler

public event EventHandler SelectedIndexChanged

C++

public:
event EventHandler^ SelectedIndexChanged {
    void add (EventHandler^ value);
    void remove (EventHandler^ value);
}

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

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

JScript

JScript では、イベントは使用できますが、新規に宣言することはできません。

解説

SelectedIndexChanged イベントは、選択された項目のインデックス位置が変更されるたびに、単一選択の ListView コントロールで発生します。複数選択の ListView コントロールの場合、このイベントは、項目が選択された項目の一覧から削除または追加されるたびに発生します。ListView コントロールで選択されている項目を確認するには、SelectedItems プロパティを使用して ListView.SelectedListViewItemCollection にアクセスします。このイベントのイベントハンドラを作成すると、ListView コントロールで選択された項目が変更されるたびにタスクを実行できます。

イベント処理の詳細については、「イベントの利用」を参照してください。

使用例

SelectedItems イベント、SelectedIndexChanged イベント、HeaderStyle のメンバ、および ListView.SelectedListViewItemCollection クラスを使用するコード例を次に示します。この例を実行するには、ListView1 という名前の ListView オブジェクトと TextBox1 という名前の TextBox が配置されている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 InitializeListView メソッドを呼び出します。この例では、イベントハンドラが正しく SelectedIndexChanged イベントに関連付けられている必要があります。

Visual Basic

    ' 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 SelectedItems property to retrieve and tally the
 price 
    ' of the selected menu items.
    Private Sub ListView1_SelectedIndexChanged_UsingItems
 _
        (ByVal sender As Object,
 ByVal e As System.EventArgs) _
        Handles ListView1.SelectedIndexChanged

        Dim breakfast As ListView.SelectedListViewItemCollection
 = _
            Me.ListView1.SelectedItems
        Dim item As ListViewItem
        Dim price As Double
 = 0.0
        For Each item In
 breakfast
            price += Double.Parse(item.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 SelectedItems property to retrieve and tally the price
 
    // of the selected menu items.
    private void ListView1_SelectedIndexChanged_UsingItems(
        object sender, System.EventArgs e)
    {

        ListView.SelectedListViewItemCollection breakfast = 
            this.ListView1.SelectedItems;
        
        double price = 0.0;
        foreach ( ListViewItem item in breakfast
 )
        {
            price += Double.Parse(item.SubItems[1].Text);
        }

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

C++

   // 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 SelectedItems property to retrieve and tally the price
 
   // of the selected menu items.
   void ListView1_SelectedIndexChanged_UsingItems( Object^ /*sender*/,
 System::EventArgs^ /*e*/ )
   {
      ListView::SelectedListViewItemCollection^ breakfast = this->ListView1->SelectedItems;
      double price = 0.0;
      System::Collections::IEnumerator^ myEnum = breakfast->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         ListViewItem^ item = safe_cast<ListViewItem^>(myEnum->Current);
         price += Double::Parse( item->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 SelectedItems property to retrieve and tally the price
 
    // of the selected menu items.
    private void listView1_SelectedIndexChanged_UsingItems(Object
 sender, 
        System.EventArgs e)
    {
        ListView.SelectedListViewItemCollection breakfast = 
            this.listView1.get_SelectedItems();

        double price = 0.0;
        for (int iCtr = 0; iCtr < breakfast.get_Count();
 iCtr++) {
            ListViewItem item = breakfast.get_Item(iCtr);
            price += System.Double.Parse(item.get_SubItems().get_Item(1).
                get_Text().ToString());
        }
        // Output the price to textBox1.
        textBox1.set_Text(System.Convert.ToString(price));
    } //listView1_SelectedIndexChanged_UsingItems

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
.NET Compact Framework
サポート対象 : 2.0、1.0

参照

関連項目
ListView クラス
ListView メンバ
System.Windows.Forms 名前空間
OnSelectedIndexChanged
EventHandler
ListView.SelectedIndices プロパティ
ListView.SelectedItems プロパティ

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ListView.SelectedIndexChanged イベントとは？ わかりやすく解説

ListView.SelectedIndexChanged イベント

ListView.SelectedIndexChanged イベントとは？わかりやすく解説