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DataGridView.AreAllCellsSelected Method

Returns a value indicating whether all the DataGridView cells are currently selected.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public bool AreAllCellsSelected(
	bool includeInvisibleCells
)

Parameters

includeInvisibleCells
Type: System.Boolean
true to include the rows and columns with Visible property values of false; otherwise, false.

Return Value

Type: System.Boolean
true if all cells (or all visible cells) are selected or if there are no cells (or no visible cells); otherwise, false.

The SelectedCells collection does not perform efficiently with large selections. To determine whether all the cells in the DataGridView have been selected before you access the contents of the SelectedCells collection, check the return value of the AreAllCellsSelected method. However, this method can cause rows to become unshared. For more information about DataGridView performance, see Best Practices for Scaling the Windows Forms DataGridView Control.

The following code example illustrates how to use this method to avoid calculations involving the SelectedCells collection.


private void selectedCellsButton_Click(object sender, System.EventArgs e)
{
    Int32 selectedCellCount =
        dataGridView1.GetCellCount(DataGridViewElementStates.Selected);
    if (selectedCellCount > 0)
    {
        if (dataGridView1.AreAllCellsSelected(true))
        {
            MessageBox.Show("All cells are selected", "Selected Cells");
        }
        else
        {
            System.Text.StringBuilder sb =
                new System.Text.StringBuilder();

            for (int i = 0;
                i < selectedCellCount; i++)
            {
                sb.Append("Row: ");
                sb.Append(dataGridView1.SelectedCells[i].RowIndex
                    .ToString());
                sb.Append(", Column: ");
                sb.Append(dataGridView1.SelectedCells[i].ColumnIndex
                    .ToString());
                sb.Append(Environment.NewLine);
            }

            sb.Append("Total: " + selectedCellCount.ToString());
            MessageBox.Show(sb.ToString(), "Selected Cells");
        }
    }
}


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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