DataGridColumnStyle.NullTextChanged-Ereignis

Tritt ein, wenn sich der NullText-Wert ändert.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

Syntax

'Declaration
Public Event NullTextChanged As EventHandler
'Usage
Dim instance As DataGridColumnStyle
Dim handler As EventHandler

AddHandler instance.NullTextChanged, handler

public event EventHandler NullTextChanged

public:
event EventHandler^ NullTextChanged {
    void add (EventHandler^ value);
    void remove (EventHandler^ value);
}

/** @event */
public void add_NullTextChanged (EventHandler value)

/** @event */
public void remove_NullTextChanged (EventHandler value)

JScript unterstützt die Verwendung von Ereignissen, aber nicht die Deklaration von neuen Ereignissen.

Hinweise

Weitere Informationen zum Behandeln von Ereignissen finden Sie unter Behandeln von Ereignissen.

Beispiel

Private Sub AddCustomColumnStyle()
   myTableStyle = New DataGridTableStyle()
   myColumnStyle = New DataGridTextBoxColumn()
   AddHandler myColumnStyle.NullTextChanged, AddressOf columnStyle_NullTextChanged
   myTableStyle.GridColumnStyles.Add(myColumnStyle)
   myDataGrid.TableStyles.Add(myTableStyle)
End Sub 'AddCustomColumnStyle

' NullTextChanged event handler of DataGridColumnStyle.
Private Sub columnStyle_NullTextChanged(ByVal sender As Object, ByVal e As EventArgs)
   Dim i As Integer
   For i = 0 To myRowcount - 1
      myCell.RowNumber = i
      myDataGrid(myCell) = Nothing
   Next i
   MessageBox.Show("NullTextChanged Event is handled")
End Sub 'columnStyle_NullTextChanged

private void AddCustomColumnStyle()
{
   myTableStyle = new DataGridTableStyle();
   myColumnStyle = new DataGridTextBoxColumn();
   myColumnStyle.NullTextChanged += new EventHandler(columnStyle_NullTextChanged);
   myTableStyle.GridColumnStyles.Add(myColumnStyle);
   myDataGrid.TableStyles.Add(myTableStyle);
 
}
// NullTextChanged event handler of DataGridColumnStyle.
private void columnStyle_NullTextChanged(object sender, EventArgs e)
{
   for(int i=0;i<myRowcount;i++)
   {
      myCell.RowNumber = i;
      myDataGrid[myCell] = null;
   }
   MessageBox.Show("NullTextChanged Event is handled");
}

private:
   void AddCustomColumnStyle()
   {
      myTableStyle = gcnew DataGridTableStyle;
      myColumnStyle = gcnew DataGridTextBoxColumn;
      myColumnStyle->NullTextChanged += gcnew EventHandler( this, &MyForm::columnStyle_NullTextChanged );
      myTableStyle->GridColumnStyles->Add( myColumnStyle );
      myDataGrid->TableStyles->Add( myTableStyle );
   }

   // NullTextChanged event handler of DataGridColumnStyle.
   void columnStyle_NullTextChanged( Object^ /*sender*/, EventArgs^ /*e*/ )
   {
      for ( int i = 0; i < myRowcount; i++ )
      {
         myCell.RowNumber = i;
         myDataGrid[ myCell ] = nullptr;

      }
      MessageBox::Show( "NullTextChanged Event is handled" );
   }

private void AddCustomColumnStyle()
{
    myTableStyle = new DataGridTableStyle();
    myColumnStyle = new DataGridTextBoxColumn();
    myColumnStyle.add_NullTextChanged(new EventHandler(
        columnStyle_NullTextChanged));
    myTableStyle.get_GridColumnStyles().Add(myColumnStyle);
    myDataGrid.get_TableStyles().Add(myTableStyle);
} //AddCustomColumnStyle

// NullTextChanged event handler of DataGridColumnStyle.
private void columnStyle_NullTextChanged(Object sender, EventArgs e)
{
    for(int i = 0; i < myRowcount; i++) {
        myCell.set_RowNumber(i);
        myDataGrid.set_Item(myCell, null);
    }
    MessageBox.Show("NullTextChanged Event is handled");
} //columnStyle_NullTextChanged

Plattformen

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1, 1.0

Siehe auch

Referenz

DataGridColumnStyle-Klasse
DataGridColumnStyle-Member
System.Windows.Forms-Namespace
EnterNullValue