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PivotGridControl.CustomFieldSort Event

Provides the capability to sort data using custom rules.

Namespace: DevExpress.XtraPivotGrid

Assembly: DevExpress.XtraPivotGrid.v18.2.dll

Declaration

public event PivotGridCustomFieldSortEventHandler CustomFieldSort

Event Data

The CustomFieldSort event's data class is PivotGridCustomFieldSortEventArgs. The following properties provide information specific to this event:

Property Description
Data For internal use.
Field Gets the field whose values are being compared.
Handled Gets or sets whether a comparison operation is being handled, so no default processing is required.
ListSourceRowIndex1 Gets the index in the data source for the first of the two rows being compared.
ListSourceRowIndex2 Gets the index in the data source for the second of the two rows being compared.
Result Gets or sets the result of a custom comparison.
SortLocation Gets a target UI element to whose values sorting is applied.
SortOrder Gets the sort order applied to the field.
Value1 Gets the first value being compared.
Value2 Gets the second value being compared.

The event data class exposes the following methods:

Method Description
GetListSourceColumnValue(Int32, String) Gets a value from the specified row and column.
GetSortResult() For internal use.
SetArgs(ICustomSortRowsEventArgs) Initializes the PivotGridCustomFieldSortEventArgsBase<T> instance with values obtained from the specified object. For internal use.

Remarks

The CustomFieldSort event occurs for the field whose PivotGridFieldBase.SortMode property is set to the PivotSortMode.Custom value. Handle the CustomFieldSort event to provide a custom sorting algorithm for the field values.

The CustomFieldSort event fires for pairs of rows in the underlying data source, before data is grouped according to the layout of column and row fields. The field values in these rows are specified by the PivotGridCustomFieldSortEventArgsBase<T>.Value1 and PivotGridCustomFieldSortEventArgsBase<T>.Value2 parameters. Compare these values and assign the result to the PivotGridCustomFieldSortEventArgsBase<T>.Result property as follows:

  • Set the 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 the 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 the Result to 0 to indicate that the rows are equal. In this case, the compared rows will be grouped into one field value.
NOTE

Note that the sorting is applied before grouping. If the rows are equal (the Result is set to 0), the field values are in the same group.

To get additional data from the underlying data source, use the PivotGridCustomFieldSortEventArgsBase<T>.GetListSourceColumnValue method. Parameters - column name and row index - are available as the PivotGridCustomFieldSortEventArgs class property values.

Set the PivotGridCustomFieldSortEventArgsBase<T>.Handled property to true to finalize the comparison and use the e.Result value. Otherwise, the default comparison is in effect and e.Result is ignored.

NOTE

The CustomFieldSort event occurs in different situations in PivotDataProcessingEngine.Legacy and PivotDataProcessingEngine.LegacyOptimized modes because of the different workflow - the legacy engine aggregates data after sorting performed at the data source level, while the optimized engine sorts the aggregated data. The legacy engine raises the CustomFieldSort event more often to compare different rows of data. The optimized engine raises the event to compare the resulting data groups.

However, you can still use the CustomFieldDataEventArgsBase<T>.ListSourceRowIndex property and the CustomFieldDataEventArgsBase<T>.GetListSourceColumnValue method. They return the data from the first data row included in the processed group.

The CustomFieldSort event also fires to sort unique filter values in the Filter Drop-Down. In this situation, the e.SortLocation property value is PivotSortLocation.Filter or PivotSortLocation.GroupFilter. A field value in a filter relates to multiple rows in the underlying data source, and you cannot use the ListSourceRowIndex1 and ListSourceRowIndex2 properties to identify underlying rows.

IMPORTANT

ListSourceRowIndex1 and ListSourceRowIndex2 properties are always -1 when the event fires for the field located in the Filter Drop-Down.

NOTE

Custom sorting is not supported in OLAP or server mode. To sort data in OLAP and server mode using custom algorithms, handle the PivotGridControl.CustomServerModeSort event.

Examples

This example demonstrates how to sort a field (Sales Person) by the hidden data field values (Last Name) in the pivot’s column header (the field’s SortLocation is Pivot ). If a field is located in a filter popup, a custom comparison method is used to to sort the field values.

NOTE

The complete sample project CustomFieldSort - How to Use a Hidden Field to Sort the Visible Field is available in the DevExpress Examples repository.

using DevExpress.XtraEditors;
using DevExpress.XtraPivotGrid;
using System;
using System.Collections;

namespace CustomFieldSortExample
{
    public partial class Form1 : XtraForm
    {
        public Form1()
        {
            InitializeComponent();
            pivotGridControl1.CustomFieldSort += new PivotGridCustomFieldSortEventHandler(pivotGridControl1_CustomFieldSort);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            excelDataSource1.FileName = "SalesPerson.xlsx";
            excelDataSource1.Fill();
            pivotGridControl1.BestFit();
        }

        private void checkEdit1_CheckedChanged(object sender, EventArgs e)
        {
            fieldSalesPerson1.SortMode = ((CheckEdit)sender).Checked ? PivotSortMode.Custom : PivotSortMode.Default;
        }
        void pivotGridControl1_CustomFieldSort(object sender, PivotGridCustomFieldSortEventArgs e)
        {
            if (e.Field.FieldName == "Sales Person")
            {
                if (e.SortLocation == PivotSortLocation.Pivot)
                {
                    object orderValue1 = e.GetListSourceColumnValue(e.ListSourceRowIndex1, "Last Name"),
                        orderValue2 = e.GetListSourceColumnValue(e.ListSourceRowIndex2, "Last Name");
                    e.Result = Comparer.Default.Compare(orderValue1, orderValue2);
                }
                else
                {
                    e.Result = Comparer.Default.Compare(e.Value1.ToString().Split(' ')[1], e.Value2.ToString().Split(' ')[1]);
                }
                e.Handled = true;
            }
        }
    }
}
See Also