/// <summary>
/// Removes the summary rows that match the specified <paramref name="summaryPosition"/> and grouped by
/// <paramref name="groupFromCol"/> and <paramref name="groupToCol"/>.
/// </summary>
/// <param name="grid">Target <see cref="DataGridView"/>.</param>
/// <param name="summaryPosition">Position of the summary rows to remove.</param>
/// <param name="groupFromCol">First column that determnines the group break values.</param>
/// <param name="groupToCol">Last column that determines the group break values.</param>
public static void RemoveSummaryRows(this DataGridView grid, SummaryRowPosition summaryPosition, DataGridViewColumn groupFromCol, DataGridViewColumn groupToCol)
{
lock (grid.Rows)
{
// clear existing aggregates.
DataGridViewSummaryRow summaryRow = null;
while ((summaryRow = RetrieveSummaryRow(grid, null, summaryPosition, groupFromCol, groupToCol)) != null)
{
grid.Rows.Remove(summaryRow);
}
}
}
private static DataGridViewSummaryRow CreateSummaryRow(
DataGridView grid,
DataGridViewRow[] group,
SummaryType summaryType,
SummaryRowPosition summaryPosition,
DataGridViewColumn groupFromCol, DataGridViewColumn groupToCol,
DataGridViewColumn summaryCol,
DataGridViewCellStyle style)
{
if (group.Length > 0)
{
// create and add the summary row.
var summaryRow = new DataGridViewSummaryRow(
group,
groupFromCol,
groupToCol,
summaryPosition);
summaryRow.ReadOnly = true;
if (style != null)
{
summaryRow.DefaultCellStyle = style;
}
switch (summaryPosition)
{
case SummaryRowPosition.Above:
grid.Rows.Insert(FindInsertIndex(grid, group, summaryPosition), summaryRow);
break;
case SummaryRowPosition.Parent:
grid.Rows.Insert(FindInsertIndex(grid, group, summaryPosition), summaryRow);
foreach (var r in group)
{
r.ParentRow = summaryRow;
}
break;
case SummaryRowPosition.Below:
default:
grid.Rows.Insert(FindInsertIndex(grid, group, summaryPosition), summaryRow);
break;
}
DisplayGroupValues(summaryRow);
return(summaryRow);
}
return(null);
}
/// <summary>
/// Removes the summary rows grouped by
/// <paramref name="groupFromCol"/> and <paramref name="groupToCol"/>.
/// </summary>
/// <param name="grid">Target <see cref="DataGridView"/>.</param>
/// <param name="groupFromCol">First column that determnines the group break values.</param>
/// <param name="groupToCol">Last column that determines the group break values.</param>
public static void RemoveSummaryRows(this DataGridView grid, DataGridViewColumn groupFromCol, DataGridViewColumn groupToCol)
{
lock (grid.Rows)
{
// clear existing aggregates.
foreach (SummaryRowPosition position in Enum.GetValues(typeof(SummaryRowPosition)))
{
DataGridViewSummaryRow summaryRow = null;
while ((summaryRow = RetrieveSummaryRow(grid, null, position, groupFromCol, groupToCol)) != null)
{
grid.Rows.Remove(summaryRow);
}
}
}
}
private static void CalculateSummary(DataGridViewSummaryRow summaryRow, SummaryType summaryType, DataGridViewRow[] group, DataGridViewColumn summaryCol)
{
object value = null;
if (group.Length > 0)
{
switch (summaryType)
{
case SummaryType.None:
value = null;
break;
case SummaryType.Sum:
value = CalculateSummarySum(group, summaryCol);
break;
case SummaryType.Min:
value = CalculateSummaryMin(group, summaryCol);
break;
case SummaryType.Max:
value = CalculateSummaryMax(group, summaryCol);
break;
case SummaryType.Count:
value = CalculateSummaryCount(group, summaryCol);
break;
case SummaryType.Average:
value = CalculateSummaryAverage(group, summaryCol);
break;
case SummaryType.Std:
value = CalculateSummaryStd(group, summaryCol);
break;
}
}
if (summaryCol != null)
{
summaryRow[summaryCol].Value = value;
}
}
private static void DisplayGroupValues(DataGridViewSummaryRow row)
{
// copy the group values.
if (row.GroupRows.Length > 0)
{
var groupRow = row.GroupRows[0];
int colFromIndex = row.GroupFromColumn?.Index ?? 0;
int colToIndex = row.GroupToColumn?.Index ?? row.CellCount - 1;
for (var c = colFromIndex; c <= colToIndex; c++)
{
if (c >= row.CellCount)
{
break;
}
if (c >= groupRow.CellCount)
{
break;
}
row[c].Value = groupRow[c].Value;
}
}
}
