DateTimePicker.DropDown Kejadian
Definisi
Penting
Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.
Terjadi saat kalender drop-down ditampilkan.
public:
event EventHandler ^ DropDown;
public event EventHandler DropDown;
public event EventHandler? DropDown;
member this.DropDown : EventHandler
Public Custom Event DropDown As EventHandler
Jenis Acara
Contoh
Contoh kode berikut menunjukkan penanganan DropDown peristiwa dan menggunakan MinDateTime bidang dan MaxDateTimeDateTimePicker . Untuk menjalankan contoh ini tempelkan kode berikut dalam formulir yang berisi bernama DateTimePickerDateTimePicker1
.
// When the calendar drops down, display a MessageBox indicating
// that DateTimePicker will not accept dates before MinDateTime or
// after MaxDateTime. Use a StringBuilder object to build the string
// for efficiency.
void DateTimePicker1_DropDown( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
System::Text::StringBuilder^ messageBuilder = gcnew System::Text::StringBuilder;
messageBuilder->Append( "Choose a date after: " );
messageBuilder->Append( DateTimePicker::MinDateTime.ToShortDateString() );
messageBuilder->Append( " and a date before: " );
messageBuilder->Append( DateTimePicker::MaxDateTime.ToShortDateString() );
MessageBox::Show( messageBuilder->ToString() );
}
// When the calendar drops down, display a MessageBox indicating
// that DateTimePicker will not accept dates before MinDateTime or
// after MaxDateTime. Use a StringBuilder object to build the string
// for efficiency.
private void DateTimePicker1_DropDown(object sender,
System.EventArgs e)
{
System.Text.StringBuilder messageBuilder =
new System.Text.StringBuilder();
messageBuilder.Append("Choose a date after: ");
messageBuilder.Append
(DateTimePicker.MinDateTime.ToShortDateString());
messageBuilder.Append(" and a date before: ");
messageBuilder.Append
(DateTimePicker.MaxDateTime.ToShortDateString());
MessageBox.Show(messageBuilder.ToString());
}
' When the calendar drops down, display a MessageBox indicating
' that DateTimePicker will not accept dates before MinDateTime or
' after MaxDateTime. Use a StringBuilder object to build the string
' for efficiency.
Private Sub DateTimePicker1_DropDown(ByVal sender As Object, _
ByVal e As EventArgs) Handles DateTimePicker1.DropDown
Dim messageBuilder As New System.Text.StringBuilder
messageBuilder.Append("Choose a date after: ")
messageBuilder.Append(DateTimePicker.MinDateTime.ToShortDateString)
messageBuilder.Append(" and a date before: ")
messageBuilder.Append(DateTimePicker.MaxDateTime.ToShortDateString)
MessageBox.Show(messageBuilder.ToString())
End Sub
Keterangan
Untuk informasi selengkapnya tentang menangani peristiwa, lihat Menangani dan Menaikkan Peristiwa.