DataGridViewCellFormattingEventHandler Delegado

Definición

Representa el método que controlará el evento CellFormatting de DataGridView.Represents the method that will handle the CellFormatting event of a DataGridView.

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

Parámetros

sender
Object

Origen del evento.The source of the event.

e
DataGridViewCellFormattingEventArgs

Objeto DataGridViewCellFormattingEventArgs que contiene los datos del evento.A DataGridViewCellFormattingEventArgs that contains the event data.

Ejemplos

En el ejemplo de código siguiente se muestra cómo controlar el CellFormatting evento.The following code example demonstrates how to handle the CellFormatting event.

void dataGridView1_CellFormatting( Object^ /*sender*/, DataGridViewCellFormattingEventArgs^ e )
{
   // If the column is the Artist column, check the
   // value.
   if ( this->dataGridView1->Columns[ e->ColumnIndex ]->Name->Equals( "Artist" ) )
   {
      if ( e->Value != nullptr )
      {
         // Check for the string "pink" in the cell.
         String^ stringValue = dynamic_cast<String^>(e->Value);
         stringValue = stringValue->ToLower();
         if ( (stringValue->IndexOf( "pink" ) > -1) )
         {
            DataGridViewCellStyle^ pinkStyle = gcnew DataGridViewCellStyle;

            //Change the style of the cell.
            pinkStyle->BackColor = Color::Pink;
            pinkStyle->ForeColor = Color::Black;
            pinkStyle->Font = gcnew System::Drawing::Font( "Times New Roman",8,FontStyle::Bold );
            e->CellStyle = pinkStyle;
         }
         
      }
   }
   else
   if ( this->dataGridView1->Columns[ e->ColumnIndex ]->Name->Equals( "Release Date" ) )
   {
      ShortFormDateFormat( e );
   }
}


//Even though the date internaly stores the year as YYYY, using formatting, the
//UI can have the format in YY.  
void ShortFormDateFormat( DataGridViewCellFormattingEventArgs^ formatting )
{
   if ( formatting->Value != nullptr )
   {
      try
      {
         System::Text::StringBuilder^ dateString = gcnew System::Text::StringBuilder;
         DateTime theDate = DateTime::Parse( formatting->Value->ToString() );
         dateString->Append( theDate.Month );
         dateString->Append( "/" );
         dateString->Append( theDate.Day );
         dateString->Append( "/" );
         dateString->Append( theDate.Year.ToString()->Substring( 2 ) );
         formatting->Value = dateString->ToString();
         formatting->FormattingApplied = true;
      }
      catch ( Exception^ /*notInDateFormat*/ ) 
      {
         // Set to false in case there are other handlers interested trying to
         // format this DataGridViewCellFormattingEventArgs instance.
         formatting->FormattingApplied = false;
      }

   }
}
private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    // If the column is the Artist column, check the
    // value.
    if (this.dataGridView1.Columns[e.ColumnIndex].Name == "Artist")
    {
        if (e.Value != null)
        {
            // Check for the string "pink" in the cell.
            string stringValue = (string)e.Value;
            stringValue = stringValue.ToLower();
            if ((stringValue.IndexOf("pink") > -1))
            {
                e.CellStyle.BackColor = Color.Pink;
            }
        }
    }
    else if (this.dataGridView1.Columns[e.ColumnIndex].Name == "Release Date")
    {
        ShortFormDateFormat(e);
    }
}

//Even though the date internaly stores the year as YYYY, using formatting, the
//UI can have the format in YY.  
private static void ShortFormDateFormat(DataGridViewCellFormattingEventArgs formatting)
{
    if (formatting.Value != null)
    {
        try
        {
            System.Text.StringBuilder dateString = new System.Text.StringBuilder();
            DateTime theDate = DateTime.Parse(formatting.Value.ToString());

            dateString.Append(theDate.Month);
            dateString.Append("/");
            dateString.Append(theDate.Day);
            dateString.Append("/");
            dateString.Append(theDate.Year.ToString().Substring(2));
            formatting.Value = dateString.ToString();
            formatting.FormattingApplied = true;
        }
        catch (FormatException)
        {
            // Set to false in case there are other handlers interested trying to
            // format this DataGridViewCellFormattingEventArgs instance.
            formatting.FormattingApplied = false;
        }
    }
}
Private Sub dataGridView1_CellFormatting(ByVal sender As Object, _
    ByVal e As DataGridViewCellFormattingEventArgs) _
    Handles dataGridView1.CellFormatting
    ' If the column is the Artist column, check the
    ' value.
    If Me.dataGridView1.Columns(e.ColumnIndex).Name _
        = "Artist" Then
        If e.Value IsNot Nothing Then

            ' Check for the string "pink" in the cell.
            Dim stringValue As String = _
            CType(e.Value, String)
            stringValue = stringValue.ToLower()
            If ((stringValue.IndexOf("pink") > -1)) Then
                e.CellStyle.BackColor = Color.Pink
            End If

        End If
    ElseIf Me.dataGridView1.Columns(e.ColumnIndex).Name _
        = "Release Date" Then
        ShortFormDateFormat(e)
    End If
End Sub

'Even though the date internaly stores the year as YYYY, using formatting, the
'UI can have the format in YY.  
Private Shared Sub ShortFormDateFormat(ByVal formatting As DataGridViewCellFormattingEventArgs)
    If formatting.Value IsNot Nothing Then
        Try
            Dim dateString As System.Text.StringBuilder = New System.Text.StringBuilder()
            Dim theDate As Date = DateTime.Parse(formatting.Value.ToString())

            dateString.Append(theDate.Month)
            dateString.Append("/")
            dateString.Append(theDate.Day)
            dateString.Append("/")
            dateString.Append(theDate.Year.ToString().Substring(2))
            formatting.Value = dateString.ToString()
            formatting.FormattingApplied = True
        Catch notInDateFormat As FormatException
            ' Set to false in case there are other handlers interested trying to
            ' format this DataGridViewCellFormattingEventArgs instance.
            formatting.FormattingApplied = False
        End Try
    End If
End Sub

Comentarios

Controle el CellFormatting evento para personalizar la conversión de un valor de celda en un formato adecuado para su presentación o para personalizar la apariencia de una celda en función de su estado o valor.Handle the CellFormatting event to customize the conversion of a cell value into a format suitable for display or to customize the appearance of a cell depending on its state or value.

El CellFormatting evento se produce cada vez que se pinta cada celda, por lo que debe evitar un procesamiento largo al controlar este evento.The CellFormatting event occurs every time each cell is painted, so you should avoid lengthy processing when handling this event. Este evento también se produce cuando FormattedValue se recupera la celda o GetFormattedValue se llama a su método.This event also occurs when the cell FormattedValue is retrieved or its GetFormattedValue method is called.

Al controlar el CellFormatting evento, la ConvertEventArgs.Value propiedad se inicializa con el valor de la celda.When you handle the CellFormatting event, the ConvertEventArgs.Value property is initialized with the cell value. Si proporciona la conversión personalizada del valor de la celda al valor para mostrar, establezca la ConvertEventArgs.Value propiedad en el valor convertido, asegurándose de que el nuevo valor es del tipo especificado por la propiedad de la celda FormattedValueType .If you provide custom conversion from the cell value to the display value, set the ConvertEventArgs.Value property to the converted value, ensuring that the new value is of the type specified by the cell FormattedValueType property. Para indicar que no es necesario ningún formato de valor adicional, establezca la DataGridViewCellFormattingEventArgs.FormattingApplied propiedad en true .To indicate that no further value formatting is necessary, set the DataGridViewCellFormattingEventArgs.FormattingApplied property to true.

Cuando el controlador de eventos se completa, si ConvertEventArgs.Value es null o no es del tipo correcto, o la DataGridViewCellFormattingEventArgs.FormattingApplied propiedad es false , Value se le aplica formato mediante las Format NullValue propiedades,, DataSourceNullValue y FormatProvider del estilo de celda devuelto por la DataGridViewCellFormattingEventArgs.CellStyle propiedad, que se inicializa mediante la propiedad de celda InheritedStyle .When the event handler completes, if the ConvertEventArgs.Value is null or is not of the correct type, or the DataGridViewCellFormattingEventArgs.FormattingApplied property is false, the Value is formatted using the Format, NullValue, DataSourceNullValue, and FormatProvider properties of the cell style returned by the DataGridViewCellFormattingEventArgs.CellStyle property, which is initialized using the cell InheritedStyle property.

Independientemente del valor de la DataGridViewCellFormattingEventArgs.FormattingApplied propiedad, se usan las propiedades de presentación del objeto devuelto por la DataGridViewCellFormattingEventArgs.CellStyle propiedad para representar la celda.Regardless of the value of the DataGridViewCellFormattingEventArgs.FormattingApplied property, the display properties of the object returned by the DataGridViewCellFormattingEventArgs.CellStyle property are used to render the cell.

Para obtener más información sobre el formato personalizado mediante el CellFormatting evento, vea Cómo: personalizar el formato de datos en el Control DataGridView Windows Forms.For more information about custom formatting using the CellFormatting event, see How to: Customize Data Formatting in the Windows Forms DataGridView Control.

Para evitar penalizaciones de rendimiento al controlar este evento, acceda a la celda a través de los parámetros del controlador de eventos en lugar de tener acceso directamente a la celda.To avoid performance penalties when handling this event, access the cell through the parameters of the event handler rather than accessing the cell directly.

Para personalizar la conversión de un valor con formato especificado por el usuario en un valor de celda real, controle el CellParsing evento.To customize the conversion of a formatted, user-specified value into an actual cell value, handle the CellParsing event.

Para obtener más información acerca de cómo controlar eventos, vea controlar y provocar eventos.For more information about how to handle events, see Handling and Raising Events.

Cuando se crea un delegado DataGridViewCellFormattingEventHandler, se identifica el método que controlará el evento.When you create a DataGridViewCellFormattingEventHandler delegate, you identify the method that will handle the event. Para asociar el evento al controlador, se debe agregar una instancia del delegado al evento.To associate the event with your event handler, add an instance of the delegate to the event. Siempre que se produce el evento, se llama a su controlador, a menos que se quite el delegado.The event handler is called whenever the event occurs, unless you remove the delegate. Para obtener más información sobre los delegados de controladores de eventos, vea controlar y provocar eventos.For more information about event-handler delegates, see Handling and Raising Events.

Métodos de extensión

GetMethodInfo(Delegate)

Obtiene un objeto que representa el método representado por el delegado especificado.Gets an object that represents the method represented by the specified delegate.

Se aplica a

Consulte también