ComboBox.SelectionChangeCommitted 事件

定義

發生於使用者變更選取的項目,而且該項變更已顯示於 ComboBox 時。Occurs when the user changes the selected item and that change is displayed in the ComboBox.

public:
 event EventHandler ^ SelectionChangeCommitted;
public event EventHandler SelectionChangeCommitted;
member this.SelectionChangeCommitted : EventHandler 
Public Custom Event SelectionChangeCommitted As EventHandler 

範例

下列程式碼範例會使用 SelectionChangeCommitted 事件和 SelectionLength 屬性,根據使用者選取和認可的內容來變更文字方塊的長度。The following code example uses the SelectionChangeCommitted event and the SelectionLength property to change the length of the text box depending on what the user has selected and committed.

void comboBox1_SelectionChangeCommitted( Object^ sender, EventArgs^ /*e*/ )
{
   ComboBox^ senderComboBox = dynamic_cast<ComboBox^>(sender);
   
   // Change the length of the text box depending on what the user has 
   // selected and committed using the SelectionLength property.
   if ( senderComboBox->SelectionLength > 0 )
   {
       textbox1->Width = 
           senderComboBox->SelectedItem->ToString()->Length * 
           ((int)this->textbox1->Font->SizeInPoints);
       textbox1->Text = senderComboBox->SelectedItem->ToString();				
   }
}
private void comboBox1_SelectionChangeCommitted(object sender, EventArgs e)
{

    ComboBox senderComboBox = (ComboBox) sender;
  
    // Change the length of the text box depending on what the user has 
    // selected and committed using the SelectionLength property.
    if (senderComboBox.SelectionLength > 0)
    {
        textbox1.Width = 
            senderComboBox.SelectedItem.ToString().Length *
            ((int) this.textbox1.Font.SizeInPoints);
        textbox1.Text = senderComboBox.SelectedItem.ToString();
    }
}
Private Sub comboBox1_SelectionChangeCommitted(ByVal sender _
As Object, ByVal e As EventArgs) _
Handles comboBox1.SelectionChangeCommitted

    Dim senderComboBox As ComboBox = CType(sender, ComboBox)

    ' Change the length of the text box depending on what the user has 
    ' selected and committed using the SelectionLength property.
    If (senderComboBox.SelectionLength > 0) Then
        textbox1.Width = _
            senderComboBox.SelectedItem.ToString().Length() * _
            CType(Me.textbox1.Font.SizeInPoints, Integer)
        textbox1.Text = senderComboBox.SelectedItem.ToString()
    End If
End Sub

備註

只有當使用者變更下拉式方塊選取專案時,才會引發 SelectionChangeCommitted 事件,而您可以建立此事件的處理常式,以便在使用者變更清單中選取的專案時,為 ComboBox 提供特殊處理。The SelectionChangeCommitted event is raised only when the user changes the combo box selection, and you can create a handler for this event to provide special handling for the ComboBox when the user changes the selected item in the list. 不過,視 ComboBox 的設定方式,以及使用者如何變更選取的專案而定,可能不會引發 SelectionChangeCommitted 事件。However, depending on how the ComboBox is configured, and how the user changes the selected item, the SelectionChangeCommitted event may not be raised. 或者,您可以處理 SelectedIndexChanged,但請注意,不論是以程式設計方式或使用者變更索引,都會發生此事件。Alternatively, you can handle the SelectedIndexChanged, but note that this event occurs whether the index is changed programmatically or by the user.

如需處理事件的詳細資訊,請參閱處理和引發事件For more information about handling events, see Handling and Raising Events.

適用於