ComboBox.DropDownOpened Kejadian

Definisi

Ruang nama:

System.Windows.Controls

Rakitan:

PresentationFramework.dll

Terjadi saat daftar drop-down kotak kombo terbuka.

public:
 event EventHandler ^ DropDownOpened;

public event EventHandler DropDownOpened;

member this.DropDownOpened : EventHandler 

Public Custom Event DropDownOpened As EventHandler 

Jenis Acara

EventHandler

Contoh

Contoh berikut menunjukkan cara menetapkan penanganan aktivitas dan menangani DropDownOpened peristiwa dan DropDownClosed .

<ComboBox Name="cb" StaysOpenOnEdit="true" IsEditable="true" DropDownOpened="OnDropDownOpened" 
        DropDownClosed="OnDropDownClosed">

void OnDropDownOpened(object sender, EventArgs e)
{
    if (cb.IsDropDownOpen == true)
    {
        cb.Text = "Combo box opened";
    }
}

void OnDropDownClosed(object sender, EventArgs e)
{
    if (cb.IsDropDownOpen == false)
    {
        cb.Text = "Combo box closed";
    }
}

Private Sub OnDropDownOpened(ByVal Sender As Object, ByVal e As EventArgs)

    If (cb.IsDropDownOpen = True) Then
        cb.Text = "Combo box opened"
    End If

End Sub

Private Sub OnDropDownClosed(ByVal Sender As Object, ByVal e As EventArgs)

    If (cb.IsDropDownOpen = False) Then
        cb.Text = "Combo box closed"
    End If

End Sub