CheckedListBox.CheckedItems Właściwość

Definicja

Kolekcja zaewidencjonowanych elementów w tym elemencie CheckedListBox .Collection of checked items in this CheckedListBox.

public:
 property System::Windows::Forms::CheckedListBox::CheckedItemCollection ^ CheckedItems { System::Windows::Forms::CheckedListBox::CheckedItemCollection ^ get(); };
[System.ComponentModel.Browsable(false)]
public System.Windows.Forms.CheckedListBox.CheckedItemCollection CheckedItems { get; }
[<System.ComponentModel.Browsable(false)>]
member this.CheckedItems : System.Windows.Forms.CheckedListBox.CheckedItemCollection
Public ReadOnly Property CheckedItems As CheckedListBox.CheckedItemCollection

Wartość właściwości

CheckedListBox.CheckedItemCollection

CheckedListBox.CheckedItemCollectionKolekcja dla CheckedListBox .The CheckedListBox.CheckedItemCollection collection for the CheckedListBox.

Atrybuty

Przykłady

Poniższy przykład wylicza zaznaczone elementy w programie, CheckedListBox.CheckedIndexCollection Aby zobaczyć, jaki jest stan zaznaczenia elementu.The following example enumerates the checked items in the CheckedListBox.CheckedIndexCollection to see what check state an item is in. W przykładzie pokazano CheckedIndices , jak użyć właściwości, aby pobrać CheckedListBox.CheckedIndexCollection i CheckedItems Właściwość w celu uzyskania CheckedListBox.CheckedItemCollection .The example demonstrates using the CheckedIndices property to get the CheckedListBox.CheckedIndexCollection, and the CheckedItems property to get the CheckedListBox.CheckedItemCollection.

Pierwsza pętla używa GetItemCheckState metody, aby uzyskać CheckState każdy zaznaczony element, na podstawie indeksu elementu.The first loop uses the GetItemCheckState method to get the CheckState of each checked item, given the index of the item. Druga pętla również używa GetItemCheckState , ale używa ListBox.ObjectCollection.IndexOf metody, aby pobrać indeks dla elementu.The second loop also uses GetItemCheckState, but uses the ListBox.ObjectCollection.IndexOf method to retrieve the index for the item.

Aby uruchomić ten przykład, wykonaj następujące czynności:To run this example, perform the following steps:

  1. Utwórz nową aplikację Windows Forms.Create a new Windows Forms application.

  2. Dodaj CheckedListBox a i a Button do formularza.Add a CheckedListBox and a Button to the form.

  3. Nadaj nazwę przyciskowi WhatIsChecked , Dodaj procedurę obsługi dla jego Click zdarzenia i skopiuj kod z treści poniższego programu obsługi.Name the button WhatIsChecked, add a handler for its Click event, and copy in the code from the body of the following handler.

  4. Dodaj elementy do CheckedListBox .Add some items to the CheckedListBox.

  5. Uruchom przykład i zaznacz pola wyboru w polu listy.Run the example and check some of the check boxes in the list box.

  6. Kliknij przycisk.Click the button.

    Zostanie wyświetlona seria pól komunikatów wskazujących, które elementy zostały zaznaczone.You will see a series of message boxes that indicate which items were checked.

void WhatIsChecked_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
   
   // Display in a message box all the items that are checked.
   // First show the index and check state of all selected items.
   IEnumerator^ myEnum1 = checkedListBox1->CheckedIndices->GetEnumerator();
   while ( myEnum1->MoveNext() )
   {
      Int32 indexChecked =  *safe_cast<Int32^>(myEnum1->Current);
      
      // The indexChecked variable contains the index of the item.
      MessageBox::Show( String::Concat( "Index#: ", indexChecked, ", is checked. Checked state is: ", checkedListBox1->GetItemCheckState( indexChecked ), "." ) );
   }

   
   // Next show the Object* title and check state for each item selected.
   IEnumerator^ myEnum2 = checkedListBox1->CheckedItems->GetEnumerator();
   while ( myEnum2->MoveNext() )
   {
      Object^ itemChecked = safe_cast<Object^>(myEnum2->Current);
      
      // Use the IndexOf method to get the index of an item.
      MessageBox::Show( String::Concat( "Item with title: \"", itemChecked, "\", is checked. Checked state is: ", checkedListBox1->GetItemCheckState( checkedListBox1->Items->IndexOf( itemChecked ) ), "." ) );
   }
}


private void WhatIsChecked_Click(object sender, System.EventArgs e) {
    // Display in a message box all the items that are checked.

    // First show the index and check state of all selected items.
    foreach(int indexChecked in checkedListBox1.CheckedIndices) {
        // The indexChecked variable contains the index of the item.
        MessageBox.Show("Index#: " + indexChecked.ToString() + ", is checked. Checked state is:" +
                        checkedListBox1.GetItemCheckState(indexChecked).ToString() + ".");
    }

    // Next show the object title and check state for each item selected.
    foreach(object itemChecked in checkedListBox1.CheckedItems) {

        // Use the IndexOf method to get the index of an item.
        MessageBox.Show("Item with title: \"" + itemChecked.ToString() +
                        "\", is checked. Checked state is: " +
                        checkedListBox1.GetItemCheckState(checkedListBox1.Items.IndexOf(itemChecked)).ToString() + ".");
    }
}
Private Sub WhatIsChecked_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles WhatIsChecked.Click
    ' Display in a message box all the items that are checked.
    Dim indexChecked As Integer
    Dim itemChecked As Object
    Const quote As String = """"

    ' First show the index and check state of all selected items.
    For Each indexChecked In CheckedListBox1.CheckedIndices
        ' The indexChecked variable contains the index of the item.
        MessageBox.Show("Index#: " + indexChecked.ToString() + ", is checked. Checked state is:" + _
                        CheckedListBox1.GetItemCheckState(indexChecked).ToString() + ".")
    Next

    ' Next show the object title and check state for each item selected.
    For Each itemChecked In CheckedListBox1.CheckedItems

        ' Use the IndexOf method to get the index of an item.
        MessageBox.Show("Item with title: " + quote + itemChecked.ToString() + quote + _
                        ", is checked. Checked state is: " + _
                        CheckedListBox1.GetItemCheckState(CheckedListBox1.Items.IndexOf(itemChecked)).ToString() + ".")
    Next

End Sub

Uwagi

Kolekcja jest podzbiorem obiektów w Items kolekcji, reprezentujących tylko te elementy, których System.Windows.Forms.CheckState jest Checked lub Indeterminate .The collection is a subset of the objects in the Items collection, representing only those items whose System.Windows.Forms.CheckState is Checked or Indeterminate. Indeksy w tej kolekcji znajdują się w kolejności rosnącej.The indexes in this collection are in ascending order.

Dotyczy

Zobacz też