CheckedListBox.GetItemCheckState(Int32) Metoda

Definicja

Zwraca wartość wskazującą stan zaznaczenia bieżącego elementu.Returns a value indicating the check state of the current item.

public:
 System::Windows::Forms::CheckState GetItemCheckState(int index);
public System.Windows.Forms.CheckState GetItemCheckState (int index);
member this.GetItemCheckState : int -> System.Windows.Forms.CheckState
Public Function GetItemCheckState (index As Integer) As CheckState

Parametry

index
Int32

Indeks elementu, dla którego ma zostać pobrana wartość.The index of the item to get the checked value of.

Zwraca

CheckState

Jedna z CheckState wartości.One of the CheckState values.

Wyjątki

indexOkreślona wartość jest mniejsza od zera.The index specified is less than zero.

-lub--or- indexOkreślona wartość jest większa lub równa liczbie elementów na liście.The index specified is greater than or equal to the count of items in the list.

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. Przykład ilustruje użycie GetItemCheckState metody w celu ustawienia stanu sprawdzania elementu.The example demonstrates using the GetItemCheckState method to set the check state of an item. W przykładzie pokazano również, jak użyć CheckedIndices właściwości, aby uzyskać CheckedListBox.CheckedIndexCollection właściwości i CheckedItems CheckedListBox.CheckedItemCollection .The example also 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.

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

GetItemCheckStateMetoda umożliwia uzyskanie CheckState wartości elementu przy użyciu indeksu.The GetItemCheckState method provides the ability to get the CheckState value of an item, given the index. Jeśli nigdy nie ustawisz stanu sprawdzania elementu na Indeterminate , użyj GetItemChecked metody.If you never set the check state of an item to Indeterminate, then use the GetItemChecked method.

Dotyczy

Zobacz też