CheckedListBox.ObjectCollection Classe

Definição

public: ref class CheckedListBox::ObjectCollection : System::Windows::Forms::ListBox::ObjectCollection

public class CheckedListBox.ObjectCollection : System.Windows.Forms.ListBox.ObjectCollection

type CheckedListBox.ObjectCollection = class
    inherit ListBox.ObjectCollection

Public Class CheckedListBox.ObjectCollection
Inherits ListBox.ObjectCollection

Herança

Object

ListBox.ObjectCollection

CheckedListBox.ObjectCollection

Exemplos

O exemplo seguinte enumera os itens do CheckedListBox e verifica todos os outros itens da lista. O exemplo demonstra o uso da Items propriedade para obter CheckedListBox.ObjectCollection o para obter o Count de itens.

O exemplo também demonstra a utilização dos SetItemCheckState métodos e SetItemChecked para definir o estado de verificação de um item. Para cada outro item que deve ser verificado, SetItemCheckState é chamado para definir o CheckState para Indeterminate, enquanto SetItemChecked é chamado no outro item para definir o estado verificado para Checked.

void CheckEveryOther_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
   
   // Cycle through every item and check every other.
   // Set flag to true to know when this code is being executed. Used in the ItemCheck
   // event handler.
   insideCheckEveryOther = true;
   for ( int i = 0; i < checkedListBox1->Items->Count; i++ )
   {
      
      // For every other item in the list, set as checked.
      if ( (i % 2) == 0 )
      {
         
         // But for each other item that is to be checked, set as being in an
         // indeterminate checked state.
         if ( (i % 4) == 0 )
                     checkedListBox1->SetItemCheckState( i, CheckState::Indeterminate );
         else
                     checkedListBox1->SetItemChecked( i, true );
      }

   }
   insideCheckEveryOther = false;
}

private void CheckEveryOther_Click(object sender, System.EventArgs e) {
    // Cycle through every item and check every other.

    // Set flag to true to know when this code is being executed. Used in the ItemCheck
    // event handler.
    insideCheckEveryOther = true;

    for (int i = 0; i < checkedListBox1.Items.Count; i++) {
        // For every other item in the list, set as checked.
        if ((i % 2) == 0) {
            // But for each other item that is to be checked, set as being in an
            // indeterminate checked state.
            if ((i % 4) == 0)
                checkedListBox1.SetItemCheckState(i, CheckState.Indeterminate);
            else
                checkedListBox1.SetItemChecked(i, true);
        }
    }

    insideCheckEveryOther = false;
}

Private Sub CheckEveryOther_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckEveryOther.Click
    ' Cycle through every item and check every other.
    Dim i As Integer

    ' Set flag to true to know when this code is being executed. Used in the ItemCheck
    ' event handler.
    insideCheckEveryOther = True

    For i = 0 To CheckedListBox1.Items.Count - 1
        ' For every other item in the list, set as checked.

        If ((i Mod 2) = 0) Then
            ' But for each other item that is to be checked, set as being in an
            ' indeterminate checked state.

            If ((i Mod 4) = 0) Then
                CheckedListBox1.SetItemCheckState(i, CheckState.Indeterminate)
            Else
                CheckedListBox1.SetItemChecked(i, True)
            End If
        End If
    Next

    insideCheckEveryOther = False

End Sub

Observações

A coleção é acedida a partir do controlo principal, CheckedListBox, pela Items propriedade. Para criar uma coleção de objetos para exibir no CheckedListBox controlo, pode adicionar ou remover os itens individualmente usando os Add métodos and Remove .