コントロール内の選択された項目のインデックスを取得します。
名前空間: System.Windows.Forms
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)
構文
'宣言
Public ReadOnly Property SelectedIndices As SelectedIndexCollection
'使用
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
プロパティ値
選択された項目のインデックスを格納している ListView.SelectedIndexCollection。項目が現在選択されていない場合は、空の ListView.SelectedIndexCollection が返されます。
解説
ListView ハンドルが作成される前にプロパティにアクセスすると、SelectedIndices プロパティにインデックスが格納されません。インデックスの格納は、通常、フォームに表示するために ListView の初期読み込みが行われたときに発生します。ハンドルが IsHandleCreated プロパティを使用して作成されているかどうかを確認できます。MultiSelect プロパティが true に設定されている場合、このプロパティは ListView 内で選択されているすべての項目のインデックスを格納するコレクションを返します。単一選択の ListView の場合、このプロパティは、ListView 内で選択されている項目のインデックスだけを保持する、単一の要素を格納するコレクションを返します。コレクションの項目で実行できるタスクの詳細については、ListView.SelectedIndexCollection のトピックを参照してください。
選択されている項目のインデックス位置ではなく、ListView コントロールで選択されている項目のコレクションを取得する場合は、SelectedItems プロパティを使用します。
使用例
SelectedIndices、SelectedIndexChanged、および HeaderStyle の各メンバと ListView.SelectedIndexCollection 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 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);
}
...
// 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 );
}
...
// 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
...
// 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
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
ListView.SelectedIndexCollection
SelectedItems