DataGridViewCell.DefaultNewRowValue DataGridViewCell.DefaultNewRowValue DataGridViewCell.DefaultNewRowValue DataGridViewCell.DefaultNewRowValue Property

Definición

Obtiene el valor predeterminado de una celda de la fila de nuevos registros.Gets the default value for a cell in the row for new records.

public:
 virtual property System::Object ^ DefaultNewRowValue { System::Object ^ get(); };
[System.ComponentModel.Browsable(false)]
public virtual object DefaultNewRowValue { get; }
member this.DefaultNewRowValue : obj
Public Overridable ReadOnly Property DefaultNewRowValue As Object

Valor de propiedad

Object que representa el valor predeterminado.An Object representing the default value.

Ejemplos

En el ejemplo de código siguiente se muestra cómo DefaultNewRowValue invalidar la CalendarCell propiedad en una clase que DataGridViewTextBoxCellderiva de.The following code example demonstrates how to override the DefaultNewRowValue property in a CalendarCell class that derives from DataGridViewTextBoxCell. Este ejemplo forma parte de un ejemplo de código más grande proporcionado en cómo: Controles host en Windows Forms celdasde DataGridView.This example is part of a larger code example provided in How to: Host Controls in Windows Forms DataGridView Cells.

public class CalendarCell : DataGridViewTextBoxCell
{

    public CalendarCell()
        : base()
    {
        // Use the short date format.
        this.Style.Format = "d";
    }

    public override void InitializeEditingControl(int rowIndex, object 
        initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
    {
        // Set the value of the editing control to the current cell value.
        base.InitializeEditingControl(rowIndex, initialFormattedValue, 
            dataGridViewCellStyle);
        CalendarEditingControl ctl = 
            DataGridView.EditingControl as CalendarEditingControl;
        // Use the default row value when Value property is null.
        if (this.Value == null)
        {
            ctl.Value = (DateTime)this.DefaultNewRowValue;
        }
        else
        {
            ctl.Value = (DateTime)this.Value;
        }
    }

    public override Type EditType
    {
        get
        {
            // Return the type of the editing control that CalendarCell uses.
            return typeof(CalendarEditingControl);
        }
    }

    public override Type ValueType
    {
        get
        {
            // Return the type of the value that CalendarCell contains.
            
            return typeof(DateTime);
        }
    }

    public override object DefaultNewRowValue
    {
        get
        {
            // Use the current date and time as the default value.
            return DateTime.Now;
        }
    }
}
Public Class CalendarCell
    Inherits DataGridViewTextBoxCell

    Public Sub New()
        ' Use the short date format.
        Me.Style.Format = "d"
    End Sub

    Public Overrides Sub InitializeEditingControl(ByVal rowIndex As Integer, _
        ByVal initialFormattedValue As Object, _
        ByVal dataGridViewCellStyle As DataGridViewCellStyle)

        ' Set the value of the editing control to the current cell value.
        MyBase.InitializeEditingControl(rowIndex, initialFormattedValue, _
            dataGridViewCellStyle)

        Dim ctl As CalendarEditingControl = _
            CType(DataGridView.EditingControl, CalendarEditingControl)

        ' Use the default row value when Value property is null.
        If (Me.Value Is Nothing) Then
            ctl.Value = CType(Me.DefaultNewRowValue, DateTime)
        Else
            ctl.Value = CType(Me.Value, DateTime)
        End If
    End Sub

    Public Overrides ReadOnly Property EditType() As Type
        Get
            ' Return the type of the editing control that CalendarCell uses.
            Return GetType(CalendarEditingControl)
        End Get
    End Property

    Public Overrides ReadOnly Property ValueType() As Type
        Get
            ' Return the type of the value that CalendarCell contains.
            Return GetType(DateTime)
        End Get
    End Property

    Public Overrides ReadOnly Property DefaultNewRowValue() As Object
        Get
            ' Use the current date and time as the default value.
            Return DateTime.Now
        End Get
    End Property

End Class

Comentarios

La DefaultNewRowValue propiedad de la clase DataGridViewCell base siempre devuelve null.The DefaultNewRowValue property in the base class DataGridViewCell always returns null. Sin embargo, esta propiedad se puede invalidar en clases de celda derivadas para devolver otros valores predeterminados.However, this property can be overridden in derived cell classes to return other default values.

El valor devuelto por esta propiedad se muestra si la celda está en la fila para los nuevos registros.The value returned by this property is displayed if the cell is in the row for new records. Este valor puede ser invalidado por un controlador para DataGridView.DefaultValuesNeeded el evento cuando el foco entra en la fila de nuevos registros.This value can be overridden by a handler for the DataGridView.DefaultValuesNeeded event when focus enters the row for new records.

Se aplica a

Consulte también: