ListViewGroup Constructores

public:
 ListViewGroup();

public ListViewGroup ();

Public Sub New ()

public:
 ListViewGroup(System::String ^ header);

public ListViewGroup (string header);

public ListViewGroup (string? header);

new System.Windows.Forms.ListViewGroup : string -> System.Windows.Forms.ListViewGroup

Public Sub New (header As String)

Parámetros

public:
 ListViewGroup(System::String ^ key, System::String ^ headerText);

public ListViewGroup (string key, string headerText);

public ListViewGroup (string? key, string? headerText);

new System.Windows.Forms.ListViewGroup : string * string -> System.Windows.Forms.ListViewGroup

Public Sub New (key As String, headerText As String)

Parámetros

public:
 ListViewGroup(System::String ^ header, System::Windows::Forms::HorizontalAlignment headerAlignment);

public ListViewGroup (string header, System.Windows.Forms.HorizontalAlignment headerAlignment);

public ListViewGroup (string? header, System.Windows.Forms.HorizontalAlignment headerAlignment);

new System.Windows.Forms.ListViewGroup : string * System.Windows.Forms.HorizontalAlignment -> System.Windows.Forms.ListViewGroup

Public Sub New (header As String, headerAlignment As HorizontalAlignment)

Parámetros

Ejemplos

En el ejemplo de código siguiente se muestra cómo se puede usar el ListViewGroup constructor en una aplicación que organiza los ListView elementos por valor de subelemento en la vista de detalles. Esta forma de agrupación es similar a la agrupación usada en Windows Explorer. En el ejemplo, los grupos se crean dinámicamente. Para cada columna de subelemento, se crea un grupo para cada valor de subelemento único. Para la columna de elemento primario, se crea un grupo para cada letra inicial única. Los grupos creados para cada columna se almacenan en una tabla hash junto con el texto del subelemento o la letra inicial. Cuando se hace clic en un encabezado de columna, este valor de texto se usa para hacer coincidir los elementos con los grupos de la columna adecuada.

Para obtener el ejemplo completo, consulte el ListViewGroup tema de referencia de información general.

   // 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;
   }

// 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;
}

' 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