ListViewGroupCollection ListViewGroupCollection ListViewGroupCollection ListViewGroupCollection Class

Définition

Représente la collection de groupes dans un contrôle 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
Héritage
ListViewGroupCollectionListViewGroupCollectionListViewGroupCollectionListViewGroupCollection
Attributs
Implémente

Exemples

L’exemple suivant montre comment utiliser la fonctionnalité ListView de regroupement pour organiser les éléments par valeur de sous-élément en mode Détails.The following example demonstrates how to use the ListView grouping feature to organize items by subitem value in the details view. Cette forme de regroupement est similaire au regroupement utilisé dans l’Explorateur Windows.This form of grouping is similar to the grouping used in Windows Explorer. Dans l’exemple, les groupes sont créés dynamiquement.In the example, the groups are created dynamically. Pour chaque colonne de sous-élément, un groupe est créé pour chaque valeur de sous-élément unique.For each subitem column, one group is created for each unique subitem value. Pour la colonne d’élément parent, un groupe est créé pour chaque lettre initiale unique.For the parent item column, one group is created for each unique initial letter. Cliquer sur l’en-tête d’une colonne trie les éléments dans les groupes créés pour cette colonne.Clicking the header of a column sorts the items into the groups created for that column. Le fait de cliquer à nouveau sur le même en-tête de colonne inverse l’ordre des groupes.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 'ListViewGroupSorter 

End Class 'ListViewGroupsExample

Remarques

Utilisez la ListView.Groups propriété pour obtenir le ListViewGroupCollection associé à un ListView contrôle.Use the ListView.Groups property to get the ListViewGroupCollection associated with a ListView control. Cette collection contient les ListViewGroup objets qui représentent les groupes affichés dans le contrôle lorsque la ListView.View propriété est définie sur une valeur autre que 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. Tous les éléments qui ne sont pas attribués à un groupe s’affichent dans le groupe par défaut, avec l'{0}étiquette d’en-tête «DefaultGroup».Any items that are not assigned to a group will appear in the default group, which has the header label "DefaultGroup{0}". Le groupe par défaut n’est pas contenu ListView.Groups dans la collection et ne peut pas être modifié.The default group is not contained in the ListView.Groups collection, and cannot be altered. Elle est surtout utile dans le débogage pour s’assurer que tous les éléments ont été correctement ajoutés aux groupes.It is primarily useful in debugging to ensure that all items have been properly added to groups. S’il n’existe aucun groupe dans ListView.Groups la collection, la fonctionnalité de regroupement est désactivée.If there are no groups in the ListView.Groups collection, the grouping feature is disabled.

Utilisez la Add méthode pour ajouter un seul groupe à la collection.Use the Add method to add a single group to the collection. Utilisez la Insert méthode pour ajouter un groupe à un index particulier dans la collection.Use the Insert method to add a group at a particular index within the collection. Pour supprimer un groupe, utilisez la Remove méthode.To remove a group, use the Remove method. Utilisez la RemoveAt méthode pour supprimer le groupe au niveau d’un index particulier.Use the RemoveAt method to remove the group at a particular index.

Vous ne pouvez pas ListViewGroup ajouter plusieurs fois un à la collection.You cannot add a ListViewGroup to the collection more than once. Pour repositionner un groupe dans la collection, vous devez d’abord le supprimer de la collection, puis l’insérer à l’emplacement souhaité.To reposition a group within the collection, it must first be removed from the collection, and then inserted at the desired location. Utilisez la Contains méthode pour déterminer si un groupe particulier figure déjà dans la collection.Use the Contains method to determine whether a particular group is already in the collection. Pour récupérer l’index d’un groupe dans la collection, utilisez la IndexOf méthode.To retrieve the index of a group within the collection, use the IndexOf method. Vous pouvez obtenir ou définir le groupe à un index particulier à l' Item[Int32] aide de l’indexeur.You can get or set the group at a particular index with the Item[Int32] indexer.

Utilisez la AddRange méthode pour ajouter plusieurs groupes à la collection.Use the AddRange method to add multiple groups to the collection. Vous pouvez ajouter plusieurs groupes en tant que tableau de groupes ou en tant ListViewGroupCollection que récupéré par le biais ListView.Groups de la propriété ListView d’un autre contrôle.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. Utilisez la Clear méthode pour supprimer tous les groupes de la collection.Use the Clear method to remove all the groups from the collection.

Notes

Les Removeméthodes RemoveAt, ListView et Clear suppriment des groupes de la collection, mais ne suppriment pas les éléments du contrôle.The Remove, RemoveAt, and Clear methods remove groups from the collection, but do not remove any items from the ListView control. S’il n’existe aucun groupe dans ListView.Groups la collection, la fonctionnalité de regroupement est désactivée et tous les éléments du contrôle s’affichent normalement.If there are no groups in the ListView.Groups collection, the grouping feature is disabled and all items in the control are displayed normally.

Les AddRange méthodes Clear et sont utiles lorsque vous souhaitez fournir plusieurs manières de regrouper les éléments dans ListView un contrôle.The AddRange and Clear methods are useful when you want to provide multiple ways to group the items in a ListView control. Pour ce faire, créez plusieurs tableaux de groupes.To do this, create multiple group arrays. Pour modifier le regroupement, utilisez d’abord la Clear méthode pour supprimer tous les groupes de la collection, puis utilisez la AddRange méthode pour ajouter le tableau suivant de groupes à afficher.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.

Utilisez la CopyTo méthode pour copier les groupes dans une collection vers un tableau compatible, en commençant à un index spécifié.Use the CopyTo method to copy the groups in a collection to a compatible array starting at a specified index. Cela est utile, par exemple, lorsque vous souhaitez trier les groupes dans la collection à l’aide Array.Sort de la méthode.This is useful, for example, when you want to sort the groups in the collection using the Array.Sort method. Pour ce faire, copiez les groupes dans un tableau compatible, puis triez le tableau.To do this, copy the groups into a compatible array, then sort the array. Ensuite, utilisez la Clear méthode pour supprimer tous les groupes de la collection, puis utilisez la AddRange méthode pour rajouter le tableau trié à la collection.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.

Utilisez la Count propriété pour déterminer le nombre de groupes dans la collection.Use the Count property to determine how many groups are in the collection. Pour itérer au sein de la collection, IEnumerator utilisez le retourné GetEnumerator par la méthode.To iterate through the collection, use the IEnumerator returned from the GetEnumerator method.

Notes

La fonctionnalité de regroupement est disponible uniquement sur Windows XP et la famille Windows Server 2003 lorsque votre application appelle la Application.EnableVisualStyles méthode.The grouping feature is available only on Windows XP and the Windows Server 2003 family when your application calls the Application.EnableVisualStyles method. Sur les systèmes d’exploitation antérieurs, tout code relatif aux groupes sera ignoré et les groupes ne s’afficheront pas.On earlier operating systems, any code relating to groups will be ignored and the groups will not appear. Par conséquent, tout code qui dépend de la fonctionnalité de regroupement peut ne pas fonctionner correctement.As a result, any code that depends on the grouping feature might not work correctly. Vous pouvez inclure un test qui détermine si la fonctionnalité de regroupement est disponible et fournir d’autres fonctionnalités lorsqu’elle n’est pas disponible.You might want to include a test that determines whether the grouping feature is available, and provide alternate functionality when it is unavailable. Par exemple, vous souhaiterez peut-être fournir un autre tri lors de l’exécution sur des systèmes d’exploitation qui ne prennent pas en charge le tri par groupe.For example, you might want to provide alternate sorting when running on operating systems that do not support sorting by group.

La fonctionnalité de marque d’insertion est fournie par la même bibliothèque qui fournit la fonctionnalité de thèmes de système d’exploitation.The insertion mark feature is provided by the same library that provides the operating system themes feature. Pour vérifier la disponibilité de cette bibliothèque, appelez la FeatureSupport.IsPresent(Object) surcharge de méthode et transmettez la OSFeature.Themes valeur.To check for the availability of this library, call the FeatureSupport.IsPresent(Object) method overload and pass in the OSFeature.Themes value.

Propriétés

Count Count Count Count

Obtient le nombre de groupes de la collection.Gets the number of groups in the collection.

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

Obtient ou définit ListViewGroup à l'index spécifié dans la collection.Gets or sets the ListViewGroup at the specified index within the collection.

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

Obtient ou définit le ListViewGroup avec la valeur de propriété Name spécifiée.Gets or sets the ListViewGroup with the specified Name property value.

Méthodes

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

Ajoute l'objet ListViewGroup spécifié à la collection.Adds the specified ListViewGroup to the collection.

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

Ajoute un nouveau ListViewGroup à la collection à l'aide des valeurs spécifiées pour initialiser les propriétés Name et 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)

Ajoute les groupes situés dans un ListViewGroupCollection existant à la collection.Adds the groups in an existing ListViewGroupCollection to the collection.

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

Ajoute un tableau de groupes à la collection.Adds an array of groups to the collection.

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

Supprime tous les groupes de la collection.Removes all groups from the collection.

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

Détermine si le groupe spécifié se trouve dans la collection.Determines whether the specified group is located in the collection.

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

Copie les groupes dans la collection dans un Array à une dimension commençant dans l'index spécifié du tableau cible.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)

Détermine si l'objet spécifié est identique à l'objet actuel.Determines whether the specified object is equal to the current object.

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

Retourne un énumérateur utilisé pour itérer au sein de la collection.Returns an enumerator used to iterate through the collection.

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

Fait office de fonction de hachage par défaut.Serves as the default hash function.

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

Obtient le Type de l'instance actuelle.Gets the Type of the current instance.

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

Retourne l'index du ListViewGroup spécifié dans la collection.Returns the index of the specified ListViewGroup within the collection.

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

Insère le ListViewGroup spécifié dans la collection, à l'index spécifié.Inserts the specified ListViewGroup into the collection at the specified index.

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

Crée une copie superficielle de l'objet Object actuel.Creates a shallow copy of the current Object.

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

Supprime l’objet ListViewGroup spécifié de la collection.Removes the specified ListViewGroup from the collection.

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

Supprime le ListViewGroup à l'index spécifié dans la collection.Removes the ListViewGroup at the specified index within the collection.

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

Retourne une chaîne qui représente l'objet actuel.Returns a string that represents the current object.

(Inherited from Object)

Implémentations d’interfaces explicites

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

Obtient une valeur indiquant si l’accès à la collection est synchronisé (thread-safe).Gets a value indicating whether access to the collection is synchronized (thread safe).

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

Obtient un objet qui peut être utilisé pour synchroniser l’accès à la collection.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)

Ajoute un nouvel objet ListViewGroup au ListViewGroupCollection.Adds a new ListViewGroup to the ListViewGroupCollection.

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

Détermine si la valeur spécifiée se trouve dans la collection.Determines whether the specified value is located in the collection.

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

Retourne l'index dans la collection de la valeur spécifiée.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)

Insère ListViewGroup dans ListViewGroupCollection.Inserts a ListViewGroup into the ListViewGroupCollection.

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

Obtient une valeur indiquant si la collection est de taille fixe.Gets a value indicating whether the collection has a fixed size.

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

Obtient une valeur indiquant si la collection est en lecture seule.Gets a value indicating whether the collection is read-only.

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

Obtient ou définit ListViewGroup à l'index spécifié dans la collection.Gets or sets the ListViewGroup at the specified index within the collection.

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

Supprime ListViewGroup de ListViewGroupCollection.Removes the ListViewGroup from the ListViewGroupCollection.

Méthodes d’extension

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

Effectue un cast des éléments d'un IEnumerable vers le type spécifié.Casts the elements of an IEnumerable to the specified type.

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

Filtre les éléments d'un IEnumerable en fonction du type spécifié.Filters the elements of an IEnumerable based on a specified type.

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

Active la parallélisation d'une requête.Enables parallelization of a query.

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

Convertit un IEnumerable en IQueryable.Converts an IEnumerable to an IQueryable.

S’applique à

Voir aussi