DataGridView.SortCompare Event

 

Occurs when the DataGridView compares two cell values to perform a sort operation.

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

public event DataGridViewSortCompareEventHandler SortCompare

This event occurs only when the DataSource property is not set and the VirtualMode property value is false.

This event compares pairs of cells in the column being sorted. It occurs only when the user clicks the header of a column with a SortMode property value of Automatic, or when you call the Sort(DataGridViewColumn, ListSortDirection) overload. When this event occurs for a column with a SortMode property value of Programmatic, you must display the sorting glyph yourself through the DataGridViewColumnHeaderCell.SortGlyphDirection property.

You can use this event to sort rows using the cell values in one column or in multiple columns. Use the CellValue1 and CellValue2 properties to compare cell values in the column specified in the Column property. Use the RowIndex1 and RowIndex2 properties to access values in other columns through the Rows collection.

For more information about handling events, see NIB: Consuming Events.

The following code example demonstrates how to use the SortCompare in a multiple column sort. This example is part of a larger example provided in How to: Customize Sorting in the Windows Forms DataGridView Control.

private void dataGridView1_SortCompare(object sender,
    DataGridViewSortCompareEventArgs e)
{
    // Try to sort based on the cells in the current column.
    e.SortResult = System.String.Compare(
        e.CellValue1.ToString(), e.CellValue2.ToString());

    // If the cells are equal, sort based on the ID column.
    if (e.SortResult == 0 && e.Column.Name != "ID")
    {
        e.SortResult = System.String.Compare(
            dataGridView1.Rows[e.RowIndex1].Cells["ID"].Value.ToString(),
            dataGridView1.Rows[e.RowIndex2].Cells["ID"].Value.ToString());
    }
    e.Handled = true;
}

.NET Framework
Available since 2.0
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