DataGridViewCellEventHandler DataGridViewCellEventHandler DataGridViewCellEventHandler DataGridViewCellEventHandler Delegate

Definizione

Rappresenta il metodo che gestirà gli eventi di DataGridView correlati ad operazioni su celle e righe.Represents the method that will handle DataGridView events related to cell and row operations.

public delegate void DataGridViewCellEventHandler(System::Object ^ sender, DataGridViewCellEventArgs ^ e);
public delegate void DataGridViewCellEventHandler(object sender, DataGridViewCellEventArgs e);
type DataGridViewCellEventHandler = delegate of obj * DataGridViewCellEventArgs -> unit
Public Delegate Sub DataGridViewCellEventHandler(sender As Object, e As DataGridViewCellEventArgs)

Parametri

sender
Object Object Object Object

Origine dell'evento.The source of the event.

Ereditarietà
DataGridViewCellEventHandlerDataGridViewCellEventHandlerDataGridViewCellEventHandlerDataGridViewCellEventHandler

Esempi

Nell'esempio di codice riportato di CellMouseEnter seguito CellMouseLeave viene illustrato l'utilizzo dei gestori di eventi e per determinare se è possibile fare clic su una cella.The following code example demonstrates using CellMouseEnter and CellMouseLeave event handlers to determine whether a cell can be clicked. Nell'esempio viene aggiornato ToolTipText ogni per annunciare il layout dell'immagine corrente.The example updates each ToolTipText to advertise the current image layout. Questo codice fa parte di un esempio più ampio illustrato in procedura: Utilizzare le colonne di immagini nel controlloDataGridView Windows Forms.This code is part of a larger example shown in How to: Work with Image Columns in the Windows Forms DataGridView Control.

void dataGridView1_CellMouseEnter( Object^ sender, DataGridViewCellEventArgs^ e )
{
   Bitmap^ markingUnderMouse = dynamic_cast<Bitmap^>(dataGridView1->Rows[ e->RowIndex ]->Cells[ e->ColumnIndex ]->Value);
   if ( markingUnderMouse == blank )
   {
      dataGridView1->Cursor = Cursors::Default;
   }
   else
   if ( markingUnderMouse == o || markingUnderMouse == x )
   {
      dataGridView1->Cursor = Cursors::No;
      ToolTip(e,true);
   }
}

void ToolTip( DataGridViewCellEventArgs^ e, bool showTip )
{
   DataGridViewImageCell^ cell = dynamic_cast<DataGridViewImageCell^>(dataGridView1->Rows[ e->RowIndex ]->Cells[ e->ColumnIndex ]);
   DataGridViewImageColumn^ imageColumn = dynamic_cast<DataGridViewImageColumn^>(dataGridView1->Columns[ cell->ColumnIndex ]);
   if ( showTip )
         cell->ToolTipText = imageColumn->Description;
   else
   {
      cell->ToolTipText = String::Empty;
   }
}

void dataGridView1_CellMouseLeave( Object^ sender, DataGridViewCellEventArgs^ e )
{
   ToolTip( e, false );
   dataGridView1->Cursor = Cursors::Default;
}


private void dataGridView1_CellMouseEnter(object sender,
    DataGridViewCellEventArgs e)
{
    Bitmap markingUnderMouse = (Bitmap)dataGridView1.
           Rows[e.RowIndex].
           Cells[e.ColumnIndex].Value;

    if (markingUnderMouse == blank)
    {
        dataGridView1.Cursor = Cursors.Default;
    }
    else if (markingUnderMouse == o || markingUnderMouse == x)
    {
        dataGridView1.Cursor = Cursors.No;
        ToolTip(e, true);
    }
}

private void ToolTip(DataGridViewCellEventArgs e, bool showTip)
{
    DataGridViewImageCell cell = (DataGridViewImageCell)
        dataGridView1
        .Rows[e.RowIndex].Cells[e.ColumnIndex];
    DataGridViewImageColumn imageColumn =
        (DataGridViewImageColumn)
        dataGridView1.Columns[cell.ColumnIndex];

    if (showTip) cell.ToolTipText = imageColumn.Description;
    else { cell.ToolTipText = String.Empty; }
}

private void dataGridView1_CellMouseLeave(object sender,
    DataGridViewCellEventArgs e)
{
    ToolTip(e, false);
    dataGridView1.Cursor = Cursors.Default;
}
Private Sub dataGridView1_CellMouseEnter(ByVal sender As Object, _
    ByVal e As DataGridViewCellEventArgs) _
    Handles dataGridView1.CellMouseEnter

    Dim markingUnderMouse As Bitmap = _
        CType(dataGridView1.Rows(e.RowIndex). _
            Cells(e.ColumnIndex).Value, Bitmap)

    If markingUnderMouse Is blank Then
        dataGridView1.Cursor = Cursors.Default
    ElseIf markingUnderMouse Is o OrElse markingUnderMouse Is x Then
        dataGridView1.Cursor = Cursors.No
        ToolTip(e)
    End If
End Sub

Private Sub ToolTip( _
    ByVal e As DataGridViewCellEventArgs)

    Dim cell As DataGridViewImageCell = _
        CType(dataGridView1.Rows(e.RowIndex). _
        Cells(e.ColumnIndex), DataGridViewImageCell)
    Dim imageColumn As DataGridViewImageColumn = _
        CType(dataGridView1.Columns(cell.ColumnIndex), _
        DataGridViewImageColumn)

    cell.ToolTipText = imageColumn.Description
End Sub

Private Sub dataGridView1_CellMouseLeave(ByVal sender As Object, _
    ByVal e As DataGridViewCellEventArgs) _
    Handles dataGridView1.CellMouseLeave

    dataGridView1.Cursor = Cursors.Default
End Sub

Commenti

DataGridViewCellEventHandlergestisce gli eventi DataGridView seguenti:DataGridViewCellEventHandler handles the following DataGridView events:

Quando si crea un delegato DataGridViewCellEventHandler, si identifica il metodo che gestirà l'evento.When you create a DataGridViewCellEventHandler delegate, you identify the method that will handle the event. Per associare l'evento al gestore eventi in uso, aggiungere all'evento un'istanza del delegato.To associate the event with your event handler, add an instance of the delegate to the event. Il gestore eventi viene chiamato ogni volta che si verifica l'evento, a meno che non venga rimosso il delegato.The event handler is called whenever the event occurs, unless you remove the delegate. Per ulteriori informazioni sui delegati del gestore eventi, vedere gestione e generazione di eventi.For more information about event-handler delegates, see Handling and Raising Events.

Metodi di estensione

GetMethodInfo(Delegate) GetMethodInfo(Delegate) GetMethodInfo(Delegate) GetMethodInfo(Delegate)

Ottiene un oggetto che rappresenta il metodo rappresentato dal delegato specificato.Gets an object that represents the method represented by the specified delegate.

Si applica a

Vedi anche