DataGridView.VirtualMode Propiedad

Definición

Obtiene o establece un valor que indica si proporcionó sus propias operaciones de administración de datos para el control DataGridView.

public:
 property bool VirtualMode { bool get(); void set(bool value); };
public bool VirtualMode { get; set; }
member this.VirtualMode : bool with get, set
Public Property VirtualMode As Boolean

Valor de propiedad

Boolean

true si DataGridView utiliza las operaciones de administración de datos proporcionadas; en caso contrario, false. De manera predeterminada, es false.

Ejemplos

El código de ejemplo de código siguiente usa el modo virtual para crear una tabla de enteros positivos.

using System.IO;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Drawing;
using System;

public class VirtualModeDemo : Form
{
    DataGridView dataGridView1 = new DataGridView();

    public VirtualModeDemo()
        : base()
    {
        Text = "DataGridView virtual-mode demo (cell-level commit scope)";
        dataGridView1.NewRowNeeded +=
            new DataGridViewRowEventHandler(dataGridView1_NewRowNeeded);
        dataGridView1.RowsAdded +=
            new DataGridViewRowsAddedEventHandler(dataGridView1_RowsAdded);
        dataGridView1.CellValidating +=
            new DataGridViewCellValidatingEventHandler(dataGridView1_CellValidating);
        dataGridView1.CellValueNeeded +=
            new DataGridViewCellValueEventHandler(dataGridView1_CellValueNeeded);
        dataGridView1.CellValuePushed +=
            new DataGridViewCellValueEventHandler(dataGridView1_CellValuePushed);

        Controls.Add(dataGridView1);
        dataGridView1.VirtualMode = true;
        dataGridView1.AllowUserToDeleteRows = false;
        dataGridView1.Columns.Add("Numbers", "Positive Numbers");
        dataGridView1.Rows.AddCopies(0, initialSize);
    }

    bool newRowNeeded;
    private void dataGridView1_NewRowNeeded(object sender,
        DataGridViewRowEventArgs e)
    {
        newRowNeeded = true;
    }

    const int initialSize = 5000000;
    int numberOfRows = initialSize;

    private void dataGridView1_RowsAdded(object sender,
         DataGridViewRowsAddedEventArgs e)
    {
        if (newRowNeeded)
        {
            newRowNeeded = false;
            numberOfRows = numberOfRows + 1;
        }
    }

    #region "data store maintance"
    const int initialValue = -1;

    private void dataGridView1_CellValueNeeded(object sender,
        DataGridViewCellValueEventArgs e)
    {
        if (store.ContainsKey(e.RowIndex))
        {
            // Use the store if the e value has been modified 
            // and stored.            
            e.Value = store[e.RowIndex];
        }
        else if (newRowNeeded && e.RowIndex == numberOfRows)
        {
            if (dataGridView1.IsCurrentCellInEditMode)
            {
                e.Value = initialValue;
            }
            else
            {
                // Show a blank value if the cursor is just resting
                // on the last row.
                e.Value = String.Empty;
            }
        }
        else
        {
            e.Value = e.RowIndex;
        }
    }

    private void dataGridView1_CellValuePushed(object sender,
        DataGridViewCellValueEventArgs e)
    {
        store.Add(e.RowIndex, int.Parse(e.Value.ToString()));
    }
    #endregion

    private Dictionary<int, int> store = new Dictionary<int, int>();

    private void dataGridView1_CellValidating(object sender,
        DataGridViewCellValidatingEventArgs e)
    {
        dataGridView1.Rows[e.RowIndex].ErrorText = "";
        int newInteger;

        // Don't try to validate the 'new row' until finished 
        // editing since there
        // is not any point in validating its initial value.
        if (dataGridView1.Rows[e.RowIndex].IsNewRow) { return; }
        if (!int.TryParse(e.FormattedValue.ToString(),
            out newInteger) || newInteger < 0)
        {
            e.Cancel = true;
            dataGridView1.Rows[e.RowIndex].ErrorText = "the value must be a non-negative integer";
        }
    }

    [STAThreadAttribute()]
    public static void Main()
    {
        Application.Run(new VirtualModeDemo());
    }
}
Imports System.IO
Imports System.Collections.Generic
Imports System.Windows.Forms

Public Class VirtualModeDemo
    Inherits System.Windows.Forms.Form

    Dim WithEvents dataGridView1 As New DataGridView

    Public Sub New()

        MyBase.New()

        Text = "DataGridView virtual-mode demo (cell-level commit scope)"

        Controls.Add(dataGridView1)
        dataGridView1.VirtualMode = True
        dataGridView1.AllowUserToDeleteRows = False
        dataGridView1.Columns.Add("Numbers", "Positive Numbers")
        dataGridView1.Rows.AddCopies(0, initialSize)

    End Sub

    Dim newRowNeeded As Boolean

    Private Sub dataGridView1_NewRowNeeded(ByVal sender As Object, _
        ByVal e As DataGridViewRowEventArgs) _
        Handles dataGridView1.NewRowNeeded

        newRowNeeded = True
    End Sub

    Const initialSize As Integer = 5000000
    Dim numberOfRows As Integer = initialSize

    Private Sub dataGridView1_RowsAdded(ByVal sender As Object, _
        ByVal e As DataGridViewRowsAddedEventArgs) _
        Handles dataGridView1.RowsAdded

        If newRowNeeded Then
            newRowNeeded = False
            numberOfRows = numberOfRows + 1
        End If
    End Sub

#Region "data store maintance"
    Const initialValue As Integer = -1

    Private Sub dataGridView1_CellValueNeeded(ByVal sender As Object, _
        ByVal e As DataGridViewCellValueEventArgs) _
        Handles dataGridView1.CellValueNeeded

        If store.ContainsKey(e.RowIndex) Then
            ' Use the store if the e value has been modified 
            ' and stored.
            e.Value = store(e.RowIndex)
        ElseIf newRowNeeded AndAlso e.RowIndex = numberOfRows Then
            If dataGridView1.IsCurrentCellInEditMode Then
                e.Value = initialValue
            Else
                ' Show a blank value if the cursor is just resting
                ' on the last row.
                e.Value = String.Empty
            End If
        Else
            e.Value = e.RowIndex
        End If
    End Sub

    Private Sub dataGridView1_CellValuePushed(ByVal sender As Object, _
        ByVal e As DataGridViewCellValueEventArgs) _
        Handles dataGridView1.CellValuePushed

        store.Add(e.RowIndex, CInt(e.Value))

    End Sub
#End Region

    Dim store As System.Collections.Generic.Dictionary(Of Integer, Integer) = _
        New Dictionary(Of Integer, Integer)

    Private Sub dataGridView1_CellValidating(ByVal sender As Object, _
        ByVal e _
        As DataGridViewCellValidatingEventArgs) _
        Handles dataGridView1.CellValidating

        Me.dataGridView1.Rows(e.RowIndex).ErrorText = ""
        Dim newInteger As Integer

        ' Don't try to validate the 'new row' until finished 
        ' editing since there
        ' is not any point in validating its initial value.
        If dataGridView1.Rows(e.RowIndex).IsNewRow Then Return
        If Not Integer.TryParse(e.FormattedValue.ToString(), newInteger) _
            OrElse newInteger < 0 Then

            e.Cancel = True
            Me.dataGridView1.Rows(e.RowIndex).ErrorText = "the value must be a non-negative integer"

        End If
    End Sub

    <STAThreadAttribute()> _
    Public Shared Sub Main()
        Application.Run(New VirtualModeDemo())
    End Sub
End Class

Comentarios

El modo virtual está diseñado para su uso con almacenes de datos muy grandes. Cuando la VirtualMode propiedad es true, se crea un DataGridView con un número establecido de filas y columnas y, a continuación, se controla el CellValueNeeded evento para rellenar las celdas. El modo virtual requiere la implementación de una caché de datos subyacente para controlar el rellenado, la edición y la eliminación de celdas en función de DataGridView las acciones del usuario. Para obtener más información sobre cómo implementar el modo virtual, vea How to: Implement Virtual Mode in the Windows Forms DataGridView Control.

Debe usar el modo virtual para mantener los valores de las columnas sin enlazar cuando el DataGridView control está en modo enlazado. No se admite la ordenación por columnas no enlazadas en modo enlazado.

Se aplica a

Consulte también