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 End-User Documentation

ColumnView.CustomColumnSort Event

Provides the ability to sort data using custom rules.

Namespace:DevExpress.XtraGrid.Views.Base
Assembly:DevExpress.XtraGrid.v17.1.dll

Expanded Syntax

Expanded Event Data

The event handler receives an argument of type CustomColumnSortEventArgs containing data related to this event.

The following CustomColumnSortEventArgs properties provide information specific to this event.
Property Description
Column Gets the column whose values are being compared.
Handled Gets or sets whether a comparison operation is handled and therefore no default processing is required.
ListSourceRowIndex1 Gets the index in the data source of the first of the two rows being compared.
ListSourceRowIndex2 Gets the index in the data source of the second of the two rows being compared.
Result Gets or sets the result of a custom comparison.
RowObject1 Gets the first row object being compared.
RowObject2 Gets the second row object being compared.
SortOrder Gets the current sort order applied to the column being processed.
Value1 Gets the first value being compared.
Value2 Gets the second value being compared.

Expanded Remarks

A column's GridColumn.SortMode property specifies how the View's data is sorted when sorting is applied to this column. If this property is set to DevExpress.XtraGrid.ColumnSortMode.Custom, a custom sorting algorithm can be implemented for this column via the CustomColumnSort event.

When the CustomColumnSort event is fired, two rows should be compared. The column being processed is specified by the Column parameter. The Value1 and Value2 parameters identify the values of the rows within this column.

The result of the custom comparison should be set to the Result parameter as follows:

  • set Result to -1 if the first row should be positioned above the second row when data is sorted in ascending order. When data is sorted in descending order the first row will be positioned below the second row.
  • set Result to 1 if the first row should be positioned below the second row when data is sorted in ascending order. When data is sorted in descending order the first row will be positioned above the second row.
  • set Result to 0 to indicate that the rows are equal. In this case the rows will be arranged within the View according to their indexes in the data source.

The Handled parameter should be set to true if the current comparison operation was handled. You can leave this parameter set to false to invoke the default comparison mechanism after your event handler has finished. In the latter case the custom comparison operation's result is ignored.

Note

The values being compared are specified by the CustomColumnSortEventArgs.Value1 and CustomColumnSortEventArgs.Value2 parameters. To get row values in other columns while handling the CustomColumnSort event use the methods provided by your data source. See the CustomColumnSortEventArgs.ListSourceRowIndex1 and CustomColumnSortEventArgs.ListSourceRowIndex2 parameters to obtain the indexes of the rows in the data source. Then use the methods of your data source to get the rows themselves and row values. Alternatively, you can use the GetListSourceRowCellValue method to get row values.

Expanded Online Video

Expanded Example

The following example shows how to implement custom sorting with the CustomColumnSort event. In the example, when an ItemFolderDescription column is sorted, the data will be sorted against an IsEmptyRow field instead.

It is assumed that custom sorting is enabled for the ItemFolderDescription column (its GridColumn.SortMode property is set to DevExpress.XtraGrid.ColumnSortMode.Custom).

Expanded See Also

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