ListViewGroupCollection ListViewGroupCollection ListViewGroupCollection ListViewGroupCollection Class

Definição

Representa a coleção de grupos em um controle ListView.Represents the collection of groups within a ListView control.

public ref class ListViewGroupCollection : System::Collections::IList
[System.ComponentModel.ListBindable(false)]
public class ListViewGroupCollection : System.Collections.IList
type ListViewGroupCollection = class
    interface IList
    interface ICollection
    interface IEnumerable
Public Class ListViewGroupCollection
Implements IList
Herança
ListViewGroupCollectionListViewGroupCollectionListViewGroupCollectionListViewGroupCollection
Atributos
Implementações

Exemplos

O exemplo a seguir demonstra como usar o ListView recurso de agrupamento para organizar itens por valor de subitem no modo de exibição de detalhes.The following example demonstrates how to use the ListView grouping feature to organize items by subitem value in the details view. Essa forma de agrupamento é semelhante ao agrupamento usado no Windows Explorer.This form of grouping is similar to the grouping used in Windows Explorer. No exemplo, os grupos são criados dinamicamente.In the example, the groups are created dynamically. Para cada coluna de subitem, um grupo é criado para cada valor de subitem exclusivo.For each subitem column, one group is created for each unique subitem value. Para a coluna item pai, um grupo é criado para cada letra inicial exclusiva.For the parent item column, one group is created for each unique initial letter. Clicar no cabeçalho de uma coluna classifica os itens nos grupos criados para aquela coluna.Clicking the header of a column sorts the items into the groups created for that column. Clicar no mesmo cabeçalho de coluna reverte a ordem dos grupos.Clicking the same column header again reverses the order of the groups.

#using <mscorlib.dll>
#using <System.Drawing.dll>
#using <System.dll>
#using <System.Windows.Forms.dll>
using namespace System;
using namespace System::Collections; 
using namespace System::Windows::Forms;

public ref class ListViewGroupsExample : public Form
{
private:
   ListView^ myListView;
   bool isRunningXPOrLater;

   // Declare a Hashtable array in which to store the groups.
   array<Hashtable^>^ groupTables;

   // Declare a variable to store the current grouping column.
   int groupColumn;

public:
   ListViewGroupsExample()
   {
      groupColumn = 0;
      // Initialize myListView.
      myListView = gcnew ListView();
      myListView->Dock = DockStyle::Fill;
      myListView->View = View::Details;
      myListView->Sorting = SortOrder::Ascending;

      // Create and initialize column headers for myListView.
      ColumnHeader^ columnHeader0 = gcnew ColumnHeader();
      columnHeader0->Text = "Title";
      columnHeader0->Width = -1;
      ColumnHeader^ columnHeader1 = gcnew ColumnHeader();
      columnHeader1->Text = "Author";
      columnHeader1->Width = -1;
      ColumnHeader^ columnHeader2 = gcnew ColumnHeader();
      columnHeader2->Text = "Year";
      columnHeader2->Width = -1;

      // Add the column headers to myListView.

      array<ColumnHeader^>^ temp0 = {columnHeader0, columnHeader1, columnHeader2};
      myListView->Columns->AddRange(temp0);

      // Add a handler for the ColumnClick event.
      myListView->ColumnClick += 
         gcnew ColumnClickEventHandler(this, &ListViewGroupsExample::myListView_ColumnClick);

      // Create items and add them to myListView.

      array<String^>^ temp1 = {"Programming Windows", "Petzold, Charles", "1998"};
      ListViewItem^ item0 = gcnew ListViewItem( temp1 );

      array<String^>^ temp2 = {"Code: The Hidden Language of Computer Hardware and Software",
         "Petzold, Charles", "2000"};
      ListViewItem^ item1 = gcnew ListViewItem( temp2 );

      array<String^>^ temp3 = {"Programming Windows with C#", "Petzold, Charles", "2001"};
      ListViewItem^ item2 = gcnew ListViewItem( temp3 );

      array<String^>^ temp4 = {"Coding Techniques for Microsoft Visual Basic .NET",
         "Connell, John", "2001"};
      ListViewItem^ item3 = gcnew ListViewItem( temp4 );

      array<String^>^ temp5 = {"C# for Java Developers", "Jones, Allen & Freeman, Adam",
         "2002"};
      ListViewItem^ item4 = gcnew ListViewItem( temp5 );

      array<String^>^ temp6 = {"Microsoft .NET XML Web Services Step by Step",
         "Jones, Allen & Freeman, Adam", "2002"};
      ListViewItem^ item5 = gcnew ListViewItem( temp6 );

      array<ListViewItem^>^ temp7 = {item0, item1, item2, item3, item4, item5};
      myListView->Items->AddRange( temp7 );

      // Determine whether Windows XP or a later 
      // operating system is present.
      isRunningXPOrLater = false;

      if (System::Environment::OSVersion->Version->Major > 5 ||
         ( System::Environment::OSVersion->Version->Major == 5 &&
         System::Environment::OSVersion->Version->Minor >= 1) )
      {
         isRunningXPOrLater = true;
      }

      if (isRunningXPOrLater)
      {
         // Create the groupsTable array and populate it with one 
         // hash table for each column.
         groupTables = gcnew array<Hashtable^>(myListView->Columns->Count);
         for (int column = 0; column < myListView->Columns->Count; column++)
         {
            // Create a hash table containing all the groups 
            // needed for a single column.
            groupTables[column] = CreateGroupsTable(column);
         }

         // Start with the groups created for the Title column.
         SetGroups(0);
      }

      // Initialize the form.
      this->Controls->Add(myListView);
      this->Size = System::Drawing::Size(550, 330);
      this->Text = "ListView Groups Example";
   }

   // Groups the items using the groups created for the clicked 
   // column.
private:
   void myListView_ColumnClick(
      Object^ /*sender*/, ColumnClickEventArgs^ e)
   {
      // Set the sort order to ascending when changing
      // column groups; otherwise, reverse the sort order.
      if ( myListView->Sorting == SortOrder::Descending || 
         ( isRunningXPOrLater && (e->Column != groupColumn) ) )
      {
         myListView->Sorting = SortOrder::Ascending;
      }
      else 
      {
         myListView->Sorting = SortOrder::Descending;
      }
      groupColumn = e->Column;

      // Set the groups to those created for the clicked column.
      if (isRunningXPOrLater)
      {
         SetGroups(e->Column);
      }
   }

   // Sets myListView to the groups created for the specified column.
private:
   void SetGroups(int column)
   {
      // Remove the current groups.
      myListView->Groups->Clear();

      // Retrieve the hash table corresponding to the column.
      Hashtable^ groups = dynamic_cast<Hashtable^>(groupTables[column]);

      // Copy the groups for the column to an array.
      array<ListViewGroup^>^ groupsArray = gcnew array<ListViewGroup^>(groups->Count);
      groups->Values->CopyTo(groupsArray, 0);

      // Sort the groups and add them to myListView.
      Array::Sort(groupsArray, gcnew ListViewGroupSorter(myListView->Sorting));
      myListView->Groups->AddRange(groupsArray);

      // Iterate through the items in myListView, assigning each 
      // one to the appropriate group.
      IEnumerator^ myEnum = myListView->Items->GetEnumerator();
      while (myEnum->MoveNext())
      {
         ListViewItem^ item = safe_cast<ListViewItem^>(myEnum->Current);
         // Retrieve the subitem text corresponding to the column.
         String^ subItemText = item->SubItems[column]->Text;

         // For the Title column, use only the first letter.
         if (column == 0) 
         {
            subItemText = subItemText->Substring(0, 1);
         }

         // Assign the item to the matching group.
         item->Group = dynamic_cast<ListViewGroup^>(groups[subItemText]);
      }
   }

   // Creates a Hashtable object with one entry for each unique
   // subitem value (or initial letter for the parent item)
   // in the specified column.
private:
   Hashtable^ CreateGroupsTable(int column)
   {
      // Create a Hashtable object.
      Hashtable^ groups = gcnew Hashtable();

      // Iterate through the items in myListView.
      IEnumerator^ myEnum1 = myListView->Items->GetEnumerator();
      while (myEnum1->MoveNext())
      {
         ListViewItem^ item = safe_cast<ListViewItem^>(myEnum1->Current);
         // Retrieve the text value for the column.
         String^ subItemText = item->SubItems[column]->Text;

         // Use the initial letter instead if it is the first column.
         if (column == 0) 
         {
            subItemText = subItemText->Substring(0, 1);
         }

         // If the groups table does not already contain a group
         // for the subItemText value, add a new group using the 
         // subItemText value for the group header and Hashtable key.
         if (!groups->Contains(subItemText))
         {
            groups->Add( subItemText, gcnew ListViewGroup(subItemText, 
               HorizontalAlignment::Left) );
         }
      }

      // Return the Hashtable object.
      return groups;
   }

   // Sorts ListViewGroup objects by header value.
   ref class ListViewGroupSorter : public IComparer
   {
   private:
      SortOrder order;

      // Stores the sort order.
   public:
      ListViewGroupSorter(SortOrder theOrder) 
      { 
         order = theOrder;
      }

      // Compares the groups by header value, using the saved sort
      // order to return the correct value.
      virtual int Compare(Object^ x, Object^ y)
      {
         int result = String::Compare(
            (dynamic_cast<ListViewGroup^>(x))->Header,
            (dynamic_cast<ListViewGroup^>(y))->Header
            );
         if (order == SortOrder::Ascending)
         {
            return result;
         }
         else 
         {
            return -result;
         }
      }
   };
};

[STAThread]
int main() 
{
   Application::EnableVisualStyles();
   Application::Run(gcnew ListViewGroupsExample());
}
using System;
using System.Collections; 
using System.Windows.Forms;

public class ListViewGroupsExample : Form
{
    private ListView myListView;

    // Determine whether Windows XP or a later
    // operating system is present.
    private bool isRunningXPOrLater = 
        OSFeature.Feature.IsPresent(OSFeature.Themes);

    // Declare a Hashtable array in which to store the groups.
    private Hashtable[] groupTables;

    // Declare a variable to store the current grouping column.
    int groupColumn = 0;

    public ListViewGroupsExample()
    {
        // Initialize myListView.
        myListView = new ListView();
        myListView.Dock = DockStyle.Fill;
        myListView.View = View.Details;
        myListView.Sorting = SortOrder.Ascending;

        // Create and initialize column headers for myListView.
        ColumnHeader columnHeader0 = new ColumnHeader();
        columnHeader0.Text = "Title";
        columnHeader0.Width = -1;
        ColumnHeader columnHeader1 = new ColumnHeader();
        columnHeader1.Text = "Author";
        columnHeader1.Width = -1;
        ColumnHeader columnHeader2 = new ColumnHeader();
        columnHeader2.Text = "Year";
        columnHeader2.Width = -1;

        // Add the column headers to myListView.
        myListView.Columns.AddRange(new ColumnHeader[] 
            {columnHeader0, columnHeader1, columnHeader2});

        // Add a handler for the ColumnClick event.
        myListView.ColumnClick += 
            new ColumnClickEventHandler(myListView_ColumnClick);

        // Create items and add them to myListView.
        ListViewItem item0 = new ListViewItem( new string[] 
            {"Programming Windows", 
            "Petzold, Charles", 
            "1998"} );
        ListViewItem item1 = new ListViewItem( new string[] 
            {"Code: The Hidden Language of Computer Hardware and Software", 
            "Petzold, Charles", 
            "2000"} );
        ListViewItem item2 = new ListViewItem( new string[] 
            {"Programming Windows with C#", 
            "Petzold, Charles", 
            "2001"} );
        ListViewItem item3 = new ListViewItem( new string[] 
            {"Coding Techniques for Microsoft Visual Basic .NET", 
            "Connell, John", 
            "2001"} );
        ListViewItem item4 = new ListViewItem( new string[] 
            {"C# for Java Developers", 
            "Jones, Allen & Freeman, Adam", 
            "2002"} );
        ListViewItem item5 = new ListViewItem( new string[] 
            {"Microsoft .NET XML Web Services Step by Step", 
            "Jones, Allen & Freeman, Adam", 
            "2002"} );
        myListView.Items.AddRange(
            new ListViewItem[] {item0, item1, item2, item3, item4, item5});

        if (isRunningXPOrLater)
        {
            // Create the groupsTable array and populate it with one 
            // hash table for each column.
            groupTables = new Hashtable[myListView.Columns.Count];
            for (int column = 0; column < myListView.Columns.Count; column++)
            {
                // Create a hash table containing all the groups 
                // needed for a single column.
                groupTables[column] = CreateGroupsTable(column);
            }

            // Start with the groups created for the Title column.
            SetGroups(0);
        }

        // Initialize the form.
        this.Controls.Add(myListView);
        this.Size = new System.Drawing.Size(550, 330);
        this.Text = "ListView Groups Example";
    }

    [STAThread]
    static void Main() 
    {
        Application.EnableVisualStyles();
        Application.Run(new ListViewGroupsExample());
    }

    // Groups the items using the groups created for the clicked 
    // column.
    private void myListView_ColumnClick(
        object sender, ColumnClickEventArgs e)
    {
        // Set the sort order to ascending when changing
        // column groups; otherwise, reverse the sort order.
        if ( myListView.Sorting == SortOrder.Descending || 
            ( isRunningXPOrLater && (e.Column != groupColumn) ) )
        {
            myListView.Sorting = SortOrder.Ascending;
        }
        else 
        {
            myListView.Sorting = SortOrder.Descending;
        }
        groupColumn = e.Column;

        // Set the groups to those created for the clicked column.
        if (isRunningXPOrLater)
        {
            SetGroups(e.Column);
        }
    }

    // Sets myListView to the groups created for the specified column.
    private void SetGroups(int column)
    {
        // Remove the current groups.
        myListView.Groups.Clear();

        // Retrieve the hash table corresponding to the column.
        Hashtable groups = (Hashtable)groupTables[column];

        // Copy the groups for the column to an array.
        ListViewGroup[] groupsArray = new ListViewGroup[groups.Count];
        groups.Values.CopyTo(groupsArray, 0);

        // Sort the groups and add them to myListView.
        Array.Sort(groupsArray, new ListViewGroupSorter(myListView.Sorting));
        myListView.Groups.AddRange(groupsArray);

        // Iterate through the items in myListView, assigning each 
        // one to the appropriate group.
        foreach (ListViewItem item in myListView.Items)
        {
            // Retrieve the subitem text corresponding to the column.
            string subItemText = item.SubItems[column].Text;

            // For the Title column, use only the first letter.
            if (column == 0) 
            {
                subItemText = subItemText.Substring(0, 1);
            }

            // Assign the item to the matching group.
            item.Group = (ListViewGroup)groups[subItemText];
        }
    }

    // Creates a Hashtable object with one entry for each unique
    // subitem value (or initial letter for the parent item)
    // in the specified column.
    private Hashtable CreateGroupsTable(int column)
    {
        // Create a Hashtable object.
        Hashtable groups = new Hashtable();

        // Iterate through the items in myListView.
        foreach (ListViewItem item in myListView.Items)
        {
            // Retrieve the text value for the column.
            string subItemText = item.SubItems[column].Text;

            // Use the initial letter instead if it is the first column.
            if (column == 0) 
            {
                subItemText = subItemText.Substring(0, 1);
            }

            // If the groups table does not already contain a group
            // for the subItemText value, add a new group using the 
            // subItemText value for the group header and Hashtable key.
            if (!groups.Contains(subItemText))
            {
                groups.Add( subItemText, new ListViewGroup(subItemText, 
                    HorizontalAlignment.Left) );
            }
        }

        // Return the Hashtable object.
        return groups;
    }

    // Sorts ListViewGroup objects by header value.
    private class ListViewGroupSorter : IComparer
    {
        private SortOrder order;

        // Stores the sort order.
        public ListViewGroupSorter(SortOrder theOrder) 
        { 
            order = theOrder;
        }

        // Compares the groups by header value, using the saved sort
        // order to return the correct value.
        public int Compare(object x, object y)
        {
            int result = String.Compare(
                ((ListViewGroup)x).Header,
                ((ListViewGroup)y).Header
            );
            if (order == SortOrder.Ascending)
            {
                return result;
            }
            else 
            {
                return -result;
            }
        }
    }

}
Imports System.Collections
Imports System.Windows.Forms

Public Class ListViewGroupsExample
    Inherits Form

    Private myListView As ListView

    ' Determine whether Windows XP or a later
    ' operating system is present.
    Private isRunningXPOrLater As Boolean = _
        OSFeature.Feature.IsPresent(OSFeature.Themes)
    
    ' Declare a Hashtable array in which to store the groups.
    Private groupTables() As Hashtable
    
    ' Declare a variable to store the current grouping column.
    Private groupColumn As Integer = 0
    
    Public Sub New()
        ' Initialize myListView.
        myListView = New ListView()
        myListView.Dock = DockStyle.Fill
        myListView.View = View.Details
        myListView.Sorting = SortOrder.Ascending
        
        ' Create and initialize column headers for myListView.
        Dim columnHeader0 As New ColumnHeader()
        columnHeader0.Text = "Title"
        columnHeader0.Width = -1
        Dim columnHeader1 As New ColumnHeader()
        columnHeader1.Text = "Author"
        columnHeader1.Width = -1
        Dim columnHeader2 As New ColumnHeader()
        columnHeader2.Text = "Year"
        columnHeader2.Width = -1
        
        ' Add the column headers to myListView.
        myListView.Columns.AddRange( New ColumnHeader() _
            {columnHeader0, columnHeader1, columnHeader2} )
        
        ' Add a handler for the ColumnClick event.
        AddHandler myListView.ColumnClick, AddressOf myListView_ColumnClick
        
        ' Create items and add them to myListView.
        Dim item0 As New ListViewItem( New String() _
            {"Programming Windows", _
            "Petzold, Charles", _
            "1998"} )
        Dim item1 As New ListViewItem( New String() _
            {"Code: The Hidden Language of Computer Hardware and Software", _
            "Petzold, Charles", _
            "2000"} )
        Dim item2 As New ListViewItem( New String() _
            {"Programming Windows with C#", _
            "Petzold, Charles", _
            "2001"} )
        Dim item3 As New ListViewItem( New String() _
            {"Coding Techniques for Microsoft Visual Basic .NET", _
            "Connell, John", _
            "2001"} )
        Dim item4 As New ListViewItem( New String() _
            {"C# for Java Developers", _
            "Jones, Allen / Freeman, Adam", _
            "2002"} )
        Dim item5 As New ListViewItem( New String() _
            {"Microsoft .NET XML Web Services Step by Step", _
            "Jones, Allen / Freeman, Adam", _
            "2002"} )
        myListView.Items.AddRange( _
            New ListViewItem() {item0, item1, item2, item3, item4, item5})
        
        If isRunningXPOrLater
            ' Create the groupsTable array and populate it with one 
            ' hash table for each column.
            groupTables = New Hashtable(myListView.Columns.Count) {}
            Dim column As Integer
            For column = 0 To myListView.Columns.Count - 1
                ' Create a hash table containing all the groups 
                ' needed for a single column.
                groupTables(column) = CreateGroupsTable(column)
            Next column
            
            ' Start with the groups created for the Title column.
            SetGroups(0)
        End If
        
        ' Initialize the form.
        Me.Controls.Add(myListView)
        Me.Size = New System.Drawing.Size(550, 330)
        Me.Text = "ListView Groups Example"
    End Sub
    
    <STAThread()> _
    Shared Sub Main()
        Application.EnableVisualStyles()
        Application.Run(New ListViewGroupsExample())
    End Sub
    
    ' Groups the items using the groups created for the clicked 
    ' column.
    Private Sub myListView_ColumnClick( _
        sender As Object, e As ColumnClickEventArgs)

        ' Set the sort order to ascending when changing
        ' column groups; otherwise, reverse the sort order.
        If myListView.Sorting = SortOrder.Descending OrElse _
            isRunningXPOrLater And e.Column <> groupColumn Then
            myListView.Sorting = SortOrder.Ascending
        Else
            myListView.Sorting = SortOrder.Descending
        End If
        groupColumn = e.Column
        
        ' Set the groups to those created for the clicked column.
        If isRunningXPOrLater Then
            SetGroups(e.Column)
        End If
    End Sub
    
    ' Sets myListView to the groups created for the specified column.
    Private Sub SetGroups(column As Integer)
        ' Remove the current groups.
        myListView.Groups.Clear()
        
        ' Retrieve the hash table corresponding to the column.
        Dim groups As Hashtable = CType(groupTables(column), Hashtable)
        
        ' Copy the groups for the column to an array.
        Dim groupsArray(groups.Count - 1) As ListViewGroup
        groups.Values.CopyTo(groupsArray, 0)
        
        ' Sort the groups and add them to myListView.
        Array.Sort(groupsArray, New ListViewGroupSorter(myListView.Sorting))
        myListView.Groups.AddRange(groupsArray)
        
        ' Iterate through the items in myListView, assigning each 
        ' one to the appropriate group.
        Dim item As ListViewItem
        For Each item In myListView.Items
            ' Retrieve the subitem text corresponding to the column.
            Dim subItemText As String = item.SubItems(column).Text
            
            ' For the Title column, use only the first letter.
            If column = 0 Then
                subItemText = subItemText.Substring(0, 1)
            End If 

            ' Assign the item to the matching group.
            item.Group = CType(groups(subItemText), ListViewGroup)
        Next item
    End Sub

    ' Creates a Hashtable object with one entry for each unique
    ' subitem value (or initial letter for the parent item)
    ' in the specified column.
    Private Function CreateGroupsTable(column As Integer) As Hashtable
        ' Create a Hashtable object.
        Dim groups As New Hashtable()
        
        ' Iterate through the items in myListView.
        Dim item As ListViewItem
        For Each item In myListView.Items
            ' Retrieve the text value for the column.
            Dim subItemText As String = item.SubItems(column).Text
            
            ' Use the initial letter instead if it is the first column.
            If column = 0 Then
                subItemText = subItemText.Substring(0, 1)
            End If 

            ' If the groups table does not already contain a group
            ' for the subItemText value, add a new group using the 
            ' subItemText value for the group header and Hashtable key.
            If Not groups.Contains(subItemText) Then
                groups.Add( subItemText, New ListViewGroup(subItemText, _
                    HorizontalAlignment.Left) )
            End If
        Next item
        
        ' Return the Hashtable object.
        Return groups
    End Function 'CreateGroupsTable

    ' Sorts ListViewGroup objects by header value.
    Private Class ListViewGroupSorter
        Implements IComparer 
        
        Private order As SortOrder
        
        ' Stores the sort order.
        Public Sub New(theOrder As SortOrder)
            order = theOrder
        End Sub
        
        ' Compares the groups by header value, using the saved sort
        ' order to return the correct value.
        Public Function Compare(x As Object, y As Object) As Integer _
            Implements IComparer.Compare
            Dim result As Integer = String.Compare( _
                CType(x, ListViewGroup).Header, _
                CType(y, ListViewGroup).Header )
            If order = SortOrder.Ascending Then
                Return result
            Else
                Return -result
            End If
        End Function 'Compare
    End Class

End Class

Comentários

Use a ListView.Groups propriedade para obter o ListViewGroupCollection associado a um ListView controle.Use the ListView.Groups property to get the ListViewGroupCollection associated with a ListView control. Essa coleção contém os ListViewGroup objetos que representam os grupos mostrados no controle quando a ListView.View propriedade é definida com um valor diferente de View.List.This collection contains the ListViewGroup objects that represent the groups shown in the control when the ListView.View property is set to a value other than View.List. Todos os itens que não forem atribuídos a um grupo aparecerão no grupo padrão, que tem o rótulo de cabeçalho "DefaultGroup{0}".Any items that are not assigned to a group will appear in the default group, which has the header label "DefaultGroup{0}". O grupo padrão não está contido na ListView.Groups coleção e não pode ser alterado.The default group is not contained in the ListView.Groups collection, and cannot be altered. Ele é útil principalmente na depuração para garantir que todos os itens tenham sido corretamente adicionados aos grupos.It is primarily useful in debugging to ensure that all items have been properly added to groups. Se não houver nenhum grupo na ListView.Groups coleção, o recurso de agrupamento será desabilitado.If there are no groups in the ListView.Groups collection, the grouping feature is disabled.

Use o Add método para adicionar um único grupo à coleção.Use the Add method to add a single group to the collection. Use o Insert método para adicionar um grupo em um índice específico dentro da coleção.Use the Insert method to add a group at a particular index within the collection. Para remover um grupo, use o Remove método.To remove a group, use the Remove method. Use o RemoveAt método para remover o grupo em um índice específico.Use the RemoveAt method to remove the group at a particular index.

Você não pode adicionar ListViewGroup um à coleção mais de uma vez.You cannot add a ListViewGroup to the collection more than once. Para reposicionar um grupo dentro da coleção, ele deve primeiro ser removido da coleção e, em seguida, inserido no local desejado.To reposition a group within the collection, it must first be removed from the collection, and then inserted at the desired location. Use o Contains método para determinar se um grupo específico já está na coleção.Use the Contains method to determine whether a particular group is already in the collection. Para recuperar o índice de um grupo dentro da coleção, use o IndexOf método.To retrieve the index of a group within the collection, use the IndexOf method. Você pode obter ou definir o grupo em um índice específico com o Item[Int32] indexador.You can get or set the group at a particular index with the Item[Int32] indexer.

Use o AddRange método para adicionar vários grupos à coleção.Use the AddRange method to add multiple groups to the collection. Você pode adicionar vários grupos como uma matriz de grupos ou como um ListViewGroupCollection que você recupera por meio da ListView.Groups propriedade de outro ListView controle.You can add multiple groups either as an array of groups or as a ListViewGroupCollection that you retrieve through the ListView.Groups property of another ListView control. Use o Clear método para remover todos os grupos da coleção.Use the Clear method to remove all the groups from the collection.

Observação

Os Removemétodos RemoveAt, ListView e Clear removem grupos da coleção, mas não removem nenhum item do controle.The Remove, RemoveAt, and Clear methods remove groups from the collection, but do not remove any items from the ListView control. Se não houver nenhum grupo na ListView.Groups coleção, o recurso de agrupamento será desabilitado e todos os itens no controle serão exibidos normalmente.If there are no groups in the ListView.Groups collection, the grouping feature is disabled and all items in the control are displayed normally.

Os AddRange métodos Clear e são úteis quando você deseja fornecer várias maneiras de agrupar os itens em um ListView controle.The AddRange and Clear methods are useful when you want to provide multiple ways to group the items in a ListView control. Para fazer isso, crie várias matrizes de grupo.To do this, create multiple group arrays. Para alterar o agrupamento, primeiro use o Clear método para remover todos os grupos da coleção e, em seguida, AddRange use o método para adicionar a próxima matriz de grupos a ser exibida.To change the grouping, first use the Clear method to remove all the groups from the collection, then use the AddRange method to add the next array of groups to display.

Use o CopyTo método para copiar os grupos em uma coleção para uma matriz compatível, começando em um índice especificado.Use the CopyTo method to copy the groups in a collection to a compatible array starting at a specified index. Isso é útil, por exemplo, quando você deseja classificar os grupos na coleção usando o Array.Sort método.This is useful, for example, when you want to sort the groups in the collection using the Array.Sort method. Para fazer isso, copie os grupos em uma matriz compatível e, em seguida, classifique a matriz.To do this, copy the groups into a compatible array, then sort the array. Em seguida, use Clear o método para remover todos os grupos da coleção e, em seguida AddRange , use o método para adicionar a matriz classificada de volta à coleção.Next, use the Clear method to remove all the groups from the collection, then use the AddRange method to add the sorted array back to the collection.

Use a Count propriedade para determinar quantos grupos estão na coleção.Use the Count property to determine how many groups are in the collection. Para iterar pela coleção, use o IEnumerator retornado GetEnumerator do método.To iterate through the collection, use the IEnumerator returned from the GetEnumerator method.

Observação

O recurso de agrupamento está disponível somente no Windows XP e na família Windows Server 2003 quando seu aplicativo chama Application.EnableVisualStyles o método.The grouping feature is available only on Windows XP and the Windows Server 2003 family when your application calls the Application.EnableVisualStyles method. Em sistemas operacionais anteriores, qualquer código relacionado a grupos será ignorado e os grupos não serão exibidos.On earlier operating systems, any code relating to groups will be ignored and the groups will not appear. Como resultado, qualquer código que dependa do recurso de agrupamento pode não funcionar corretamente.As a result, any code that depends on the grouping feature might not work correctly. Talvez você queira incluir um teste que determina se o recurso de agrupamento está disponível e fornecer funcionalidade alternativa quando ele não estiver disponível.You might want to include a test that determines whether the grouping feature is available, and provide alternate functionality when it is unavailable. Por exemplo, talvez você queira fornecer classificação alternativa ao executar em sistemas operacionais que não dão suporte à classificação por grupo.For example, you might want to provide alternate sorting when running on operating systems that do not support sorting by group.

O recurso de marca de inserção é fornecido pela mesma biblioteca que fornece o recurso de temas do sistema operacional.The insertion mark feature is provided by the same library that provides the operating system themes feature. Para verificar a disponibilidade dessa biblioteca, chame a FeatureSupport.IsPresent(Object) sobrecarga do método e passe o OSFeature.Themes valor.To check for the availability of this library, call the FeatureSupport.IsPresent(Object) method overload and pass in the OSFeature.Themes value.

Propriedades

Count Count Count Count

Obtém o número de grupos na coleção.Gets the number of groups in the collection.

Item[Int32] Item[Int32] Item[Int32] Item[Int32]

Obtém ou define o ListViewGroup no índice especificado na coleção.Gets or sets the ListViewGroup at the specified index within the collection.

Item[String] Item[String] Item[String] Item[String]

Obtém ou define o ListViewGroup com o valor da propriedade Name especificado.Gets or sets the ListViewGroup with the specified Name property value.

Métodos

Add(ListViewGroup) Add(ListViewGroup) Add(ListViewGroup) Add(ListViewGroup)

Adiciona o ListViewGroup especificado à coleção.Adds the specified ListViewGroup to the collection.

Add(String, String) Add(String, String) Add(String, String) Add(String, String)

Adiciona um novo ListViewGroup à coleção usando os valores especificados para inicializar as propriedades Name e HeaderAdds a new ListViewGroup to the collection using the specified values to initialize the Name and Header properties

AddRange(ListViewGroupCollection) AddRange(ListViewGroupCollection) AddRange(ListViewGroupCollection) AddRange(ListViewGroupCollection)

Adiciona os grupos em um ListViewGroupCollection existente à coleção.Adds the groups in an existing ListViewGroupCollection to the collection.

AddRange(ListViewGroup[]) AddRange(ListViewGroup[]) AddRange(ListViewGroup[]) AddRange(ListViewGroup[])

Adiciona uma matriz de grupos à coleção.Adds an array of groups to the collection.

Clear() Clear() Clear() Clear()

Remove todos os grupos da coleção.Removes all groups from the collection.

Contains(ListViewGroup) Contains(ListViewGroup) Contains(ListViewGroup) Contains(ListViewGroup)

Determina se o grupo especificado está localizado na coleção.Determines whether the specified group is located in the collection.

CopyTo(Array, Int32) CopyTo(Array, Int32) CopyTo(Array, Int32) CopyTo(Array, Int32)

Copia os grupos na coleção para uma Array unidimensional compatível, começando no índice especificado da matriz de destino.Copies the groups in the collection to a compatible one-dimensional Array, starting at the specified index of the target array.

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Determina se o objeto especificado é igual ao objeto atual.Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetEnumerator() GetEnumerator() GetEnumerator() GetEnumerator()

Retorna um enumerador usado para iterar por meio da coleção.Returns an enumerator used to iterate through the collection.

GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Serve como a função de hash padrão.Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

Obtém o Type da instância atual.Gets the Type of the current instance.

(Inherited from Object)
IndexOf(ListViewGroup) IndexOf(ListViewGroup) IndexOf(ListViewGroup) IndexOf(ListViewGroup)

Retorna o índice do ListViewGroup especificado na coleção.Returns the index of the specified ListViewGroup within the collection.

Insert(Int32, ListViewGroup) Insert(Int32, ListViewGroup) Insert(Int32, ListViewGroup) Insert(Int32, ListViewGroup)

Insere o ListViewGroup especificado na coleção, no índice especificado.Inserts the specified ListViewGroup into the collection at the specified index.

MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Cria uma cópia superficial do Object atual.Creates a shallow copy of the current Object.

(Inherited from Object)
Remove(ListViewGroup) Remove(ListViewGroup) Remove(ListViewGroup) Remove(ListViewGroup)

Remove o ListViewGroup especificado da coleção.Removes the specified ListViewGroup from the collection.

RemoveAt(Int32) RemoveAt(Int32) RemoveAt(Int32) RemoveAt(Int32)

Remove o ListViewGroup no índice especificado da coleção.Removes the ListViewGroup at the specified index within the collection.

ToString() ToString() ToString() ToString()

Retorna uma cadeia de caracteres que representa o objeto atual.Returns a string that represents the current object.

(Inherited from Object)

Implantações explícitas de interface

ICollection.IsSynchronized ICollection.IsSynchronized ICollection.IsSynchronized ICollection.IsSynchronized

Obtém um valor que indica se o acesso à coleção é sincronizado (thread-safe).Gets a value indicating whether access to the collection is synchronized (thread safe).

ICollection.SyncRoot ICollection.SyncRoot ICollection.SyncRoot ICollection.SyncRoot

Obtém um objeto que pode ser usado para sincronizar o acesso à coleção.Gets an object that can be used to synchronize access to the collection.

IList.Add(Object) IList.Add(Object) IList.Add(Object) IList.Add(Object)

Adiciona um novo ListViewGroup ao ListViewGroupCollection.Adds a new ListViewGroup to the ListViewGroupCollection.

IList.Contains(Object) IList.Contains(Object) IList.Contains(Object) IList.Contains(Object)

Determina se o valor especificado está localizado na coleção.Determines whether the specified value is located in the collection.

IList.IndexOf(Object) IList.IndexOf(Object) IList.IndexOf(Object) IList.IndexOf(Object)

Retorna o índice na coleção do valor especificado.Returns the index within the collection of the specified value.

IList.Insert(Int32, Object) IList.Insert(Int32, Object) IList.Insert(Int32, Object) IList.Insert(Int32, Object)

Insere um ListViewGroup no ListViewGroupCollection.Inserts a ListViewGroup into the ListViewGroupCollection.

IList.IsFixedSize IList.IsFixedSize IList.IsFixedSize IList.IsFixedSize

Obtém um valor que indica se a coleção tem um tamanho fixo.Gets a value indicating whether the collection has a fixed size.

IList.IsReadOnly IList.IsReadOnly IList.IsReadOnly IList.IsReadOnly

Obtém um valor que indica se a coleção é somente leitura.Gets a value indicating whether the collection is read-only.

IList.Item[Int32] IList.Item[Int32] IList.Item[Int32] IList.Item[Int32]

Obtém ou define o ListViewGroup no índice especificado na coleção.Gets or sets the ListViewGroup at the specified index within the collection.

IList.Remove(Object) IList.Remove(Object) IList.Remove(Object) IList.Remove(Object)

Remove o ListViewGroup do ListViewGroupCollection.Removes the ListViewGroup from the ListViewGroupCollection.

Métodos de Extensão

Cast<TResult>(IEnumerable) Cast<TResult>(IEnumerable) Cast<TResult>(IEnumerable) Cast<TResult>(IEnumerable)

Converte os elementos de um IEnumerable para o tipo especificado.Casts the elements of an IEnumerable to the specified type.

OfType<TResult>(IEnumerable) OfType<TResult>(IEnumerable) OfType<TResult>(IEnumerable) OfType<TResult>(IEnumerable)

Filtra os elementos de um IEnumerable com base em um tipo especificado.Filters the elements of an IEnumerable based on a specified type.

AsParallel(IEnumerable) AsParallel(IEnumerable) AsParallel(IEnumerable) AsParallel(IEnumerable)

Habilita a paralelização de uma consulta.Enables parallelization of a query.

AsQueryable(IEnumerable) AsQueryable(IEnumerable) AsQueryable(IEnumerable) AsQueryable(IEnumerable)

Converte um IEnumerable em um IQueryable.Converts an IEnumerable to an IQueryable.

Aplica-se a

Veja também