ListView.SelectedIndices Vlastnost
Definice
Důležité
Některé informace platí pro předběžně vydaný produkt, který se může zásadně změnit, než ho výrobce nebo autor vydá. Microsoft neposkytuje žádné záruky, výslovné ani předpokládané, týkající se zde uváděných informací.
Získá indexy vybraných položek v ovládacím prvku.
public:
property System::Windows::Forms::ListView::SelectedIndexCollection ^ SelectedIndices { System::Windows::Forms::ListView::SelectedIndexCollection ^ get(); };
[System.ComponentModel.Browsable(false)]
public System.Windows.Forms.ListView.SelectedIndexCollection SelectedIndices { get; }
[<System.ComponentModel.Browsable(false)>]
member this.SelectedIndices : System.Windows.Forms.ListView.SelectedIndexCollection
Public ReadOnly Property SelectedIndices As ListView.SelectedIndexCollection
Hodnota vlastnosti
A ListView.SelectedIndexCollection obsahující indexy vybraných položek. Pokud nejsou aktuálně vybrány žádné položky, vrátí se prázdná ListView.SelectedIndexCollection položka.
- Atributy
Příklady
Následující příklad kódu ukazuje použití SelectedIndices, SelectedIndexChangeda HeaderStyle členů a ListView.SelectedIndexCollection třídy. Chcete-li spustit tento příklad, vložte následující kód do formuláře, který obsahuje ListView objekt s názvem ListView1
a pojmenovaný TextBoxTextBox1
. Volejte metodu InitializeListView
z konstruktoru formuláře nebo Load
metody. Tento příklad vyžaduje, aby obslužná rutina události byla správně přidružena k SelectedIndexChanged události.
// 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 );
}
// 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);
}
' 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.
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();
}
// 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();
}
' 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
Poznámky
Vlastnost SelectedIndices nebude obsahovat žádné indexy, pokud se k vlastnosti přistupuje před ListView vytvořením popisovače, k čemuž obvykle dochází při ListView počátečním načtení objektu pro zobrazení ve formuláři. Můžete zkontrolovat, jestli je popisovač vytvořen s IsHandleCreated vlastností .
MultiSelect Pokud je vlastnost nastavena na true
, vrátí tato vlastnost kolekci obsahující indexy všech položek vybraných v objektu ListView. Pro jeden výběr ListViewvrátí tato vlastnost kolekci obsahující jeden prvek obsahující index pouze vybrané položky v objektu ListView. Další informace o úlohách, které lze provádět s položkami v kolekci, najdete v tématu ListView.SelectedIndexCollection.
Chcete-li získat kolekci položek, které jsou vybrány v ovládacím ListView prvku, místo umístění indexu vybraných položek, použijte SelectedItems vlastnost .