ListView.SelectedIndexCollection Classe

Definição

public: ref class ListView::SelectedIndexCollection : System::Collections::IList

public class ListView.SelectedIndexCollection : System.Collections.IList

[System.ComponentModel.ListBindable(false)]
public class ListView.SelectedIndexCollection : System.Collections.IList

type ListView.SelectedIndexCollection = class
    interface IList
    interface ICollection
    interface IEnumerable

[<System.ComponentModel.ListBindable(false)>]
type ListView.SelectedIndexCollection = class
    interface IList
    interface ICollection
    interface IEnumerable

Public Class ListView.SelectedIndexCollection
Implements IList

Herança

Object

ListView.SelectedIndexCollection

Atributos

ListBindableAttribute

Implementações

ICollection IEnumerable IList

Exemplos

O exemplo de código a seguir demonstra como usar os SelectedIndicesSelectedIndexChangedmembros e membros e HeaderStyle a ListView.SelectedIndexCollection classe. Para executar este exemplo, cole o código a seguir em um formulário que contém um ListView objeto nomeado ListView1 e um TextBox nomeado TextBox1. Chame o InitializeListView método do construtor ou Load manipulador de eventos do formulário. Este exemplo requer que o manipulador de eventos esteja corretamente associado ao SelectedIndexChanged evento.

// 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

Comentários

Um ListView.SelectedIndexCollection armazena os índices para os itens selecionados em um ListView controle. Os índices armazenados no ListView.SelectedIndexCollection índice são posições de índice dentro do ListView.ListViewItemCollection. Os ListView.ListViewItemCollection repositórios de todos os itens exibidos no ListView controle.

A tabela a seguir mostra um exemplo de como os ListView.ListViewItemCollection itens são armazenados e mostra seus estados de ListView seleção em um exemplo ListView.

Com base no ListView.ListViewItemCollection exemplo na tabela anterior, a tabela a seguir demonstra como ela ListView.SelectedIndexCollection seria exibida.

Você pode usar as propriedades e os métodos dessa classe para executar uma variedade de tarefas com a coleção. O Contains método permite determinar se uma posição de índice é ListView.ListViewItemCollection um dos índices armazenados no ListView.SelectedIndexCollection. Depois de saber que o item está na coleção, você pode usar o IndexOf método para determinar a posição do índice no ListView.SelectedIndexCollection.