Bearbeiten

Freigeben über

DataGridView.InvalidateCell Method

  • Reference

Definition

Namespace:
System.Windows.Forms
Assembly:
System.Windows.Forms.dll

Invalidates a cell in the DataGridView, forcing it to be repainted.

Overloads

InvalidateCell(DataGridViewCell)

Invalidates the specified cell of the DataGridView, forcing it to be repainted.
InvalidateCell(Int32, Int32)

Invalidates the cell with the specified row and column indexes, forcing it to be repainted.

InvalidateCell(DataGridViewCell)

Invalidates the specified cell of the DataGridView, forcing it to be repainted.

public:
 void InvalidateCell(System::Windows::Forms::DataGridViewCell ^ dataGridViewCell);
public void InvalidateCell (System.Windows.Forms.DataGridViewCell dataGridViewCell);
member this.InvalidateCell : System.Windows.Forms.DataGridViewCell -> unit
Public Sub InvalidateCell (dataGridViewCell As DataGridViewCell)

Parameters

dataGridViewCell
DataGridViewCell

The DataGridViewCell to invalidate.

Exceptions

ArgumentException

dataGridViewCell does not belong to the DataGridView.

ArgumentNullException

dataGridViewCell is null.

Examples

The following code example illustrates how to use this method in a customized DataGridViewCell that is painted with a custom border when the mouse pointer rests on it. In the example, the cell is invalidated when the mouse pointer enters or leaves it.

This code is part of a larger example available in How to: Customize Cells and Columns in the Windows Forms DataGridView Control by Extending Their Behavior and Appearance.

// Force the cell to repaint itself when the mouse pointer enters it.
protected override void OnMouseEnter(int rowIndex)
{
    this.DataGridView.InvalidateCell(this);
}

// Force the cell to repaint itself when the mouse pointer leaves it.
protected override void OnMouseLeave(int rowIndex)
{
    this.DataGridView.InvalidateCell(this);
}

' Force the cell to repaint itself when the mouse pointer enters it.
Protected Overrides Sub OnMouseEnter(ByVal rowIndex As Integer)
    Me.DataGridView.InvalidateCell(Me)
End Sub

' Force the cell to repaint itself when the mouse pointer leaves it.
Protected Overrides Sub OnMouseLeave(ByVal rowIndex As Integer)
    Me.DataGridView.InvalidateCell(Me)
End Sub

Remarks

This method is useful to force a cell repaint in conditions that would not normally cause a cell to be repainted. For example, you can use this method with a custom cell type that changes its appearance as a result of external events.

For more information about painting and invalidation, see Invalidate.

See also

Applies to

InvalidateCell(Int32, Int32)

Invalidates the cell with the specified row and column indexes, forcing it to be repainted.

public:
 void InvalidateCell(int columnIndex, int rowIndex);
public void InvalidateCell (int columnIndex, int rowIndex);
member this.InvalidateCell : int * int -> unit
Public Sub InvalidateCell (columnIndex As Integer, rowIndex As Integer)

Parameters

columnIndex
Int32

The column index of the cell to invalidate.

rowIndex
Int32

The row index of the cell to invalidate.

Exceptions

ArgumentOutOfRangeException

columnIndex is less than -1 or greater than the number of columns in the control minus 1.

-or-

rowIndex is less than -1 or greater than the number of rows in the control minus 1.

Examples

The following code example illustrates how to use this method in a custom cell type that changes a cell's appearance when the user rests the mouse pointer over it. This example is part of a larger example available in How to: Customize Cells and Columns in the Windows Forms DataGridView Control by Extending Their Behavior and Appearance.

// Force the cell to repaint itself when the mouse pointer enters it.
protected override void OnMouseEnter(int rowIndex)
{
    this.DataGridView.InvalidateCell(this);
}

// Force the cell to repaint itself when the mouse pointer leaves it.
protected override void OnMouseLeave(int rowIndex)
{
    this.DataGridView.InvalidateCell(this);
}

' Force the cell to repaint itself when the mouse pointer enters it.
Protected Overrides Sub OnMouseEnter(ByVal rowIndex As Integer)
    Me.DataGridView.InvalidateCell(Me)
End Sub

' Force the cell to repaint itself when the mouse pointer leaves it.
Protected Overrides Sub OnMouseLeave(ByVal rowIndex As Integer)
    Me.DataGridView.InvalidateCell(Me)
End Sub

Remarks

This method is useful to force a cell repaint in conditions that would not normally cause a cell to be repainted. For example, you can use this method with a custom cell type that changes its appearance as a result of external events.

For more information about painting and invalidation, see Invalidate.

See also

Applies to