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
'宣言
Public Event SelectedIndexChanged As EventHandler
'使用
Dim instance As ListView
Dim handler As EventHandler
AddHandler instance.SelectedIndexChanged, handler
public event EventHandler SelectedIndexChanged
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 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。
' 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
...
' 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);
}
...
// 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();
}
// 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 );
}
...
// 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
...
// 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