PivotGridControl.CustomFieldSort Event

Allows you to provide a custom sorting algorithm for the field values.

Namespace: DevExpress.XtraPivotGrid

Assembly: DevExpress.XtraPivotGrid.v20.2.dll

Declaration

C#

public event PivotGridCustomFieldSortEventHandler CustomFieldSort

VB.NET

Public Event CustomFieldSort As PivotGridCustomFieldSortEventHandler

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.

Important

In OLAP or server mode, handle the PivotGridControl.CustomServerModeSort event instead.

How to Sort Field Values in Pivot Grid

The CustomFieldSort event fires for pairs of field values before they are grouped according to the layout of column and row fields. To establish a new sort order, follow the steps listed below.

1. Get values to compare from the e.Value1 and e.Value2 properties.

2. Compare these values and assign the result to the e.Result property as follows:

   • -1 if the first value should be placed before the second value when values are sorted in ascending order. When values are sorted in descending order, the first value is after the second value.
   • 1 if the first value should be placed after the second value when values are sorted in ascending order. When values are sorted in descending order, the first value is placed before the second value.
   • 0 to indicate that the values are equal. The rows are grouped into one field value.

   Note

   Values are sorted before grouping. If the values are equal (the e.Result is set to 0), they are in the same group.

   To get additional field values from the data source, call the e.GetListSourceColumnValue method with the following parameters:

   • Set row index parameter to the e.ListSourceRowIndex1 or e.ListSourceRowIndex2 value
   • Set the column name parameter to the field name. The current field name is available with the e.Field.FieldName property.

3. Set the e.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 e.ListSourceRowIndex1 and e.ListSourceRowIndex2 properties and the e.GetListSourceColumnValue method. They return the data from the first data row included in the processed group.

How to Sort Filter Values in Filter Drop-Down

Handle the CustomFieldSort event to sort unique filter values in the Filter Drop-Down. To determine whether the data comes from the filter, check the e.SortLocation property - its value is PivotSortLocation.Filter or PivotSortLocation.GroupFilter.

Important

A field value in a filter relates to multiple rows in the underlying data source. The ListSourceRowIndex1 and ListSourceRowIndex2 properties are always -1 when the event fires for the field located in the Filter Drop-Down.

Example

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.

C#

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;
            }
        }
    }
}

VB.NET

Imports DevExpress.XtraEditors
Imports DevExpress.XtraPivotGrid
Imports System
Imports System.Collections

Namespace CustomFieldSortExample
  Partial Public Class Form1
    Inherits XtraForm

    Public Sub New()
      InitializeComponent()
      AddHandler pivotGridControl1.CustomFieldSort, AddressOf pivotGridControl1_CustomFieldSort
    End Sub

    Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
      excelDataSource1.FileName = "SalesPerson.xlsx"
      excelDataSource1.Fill()
      pivotGridControl1.BestFit()
    End Sub

    Private Sub checkEdit1_CheckedChanged(ByVal sender As Object, ByVal e As EventArgs) Handles checkEdit1.CheckedChanged
      fieldSalesPerson1.SortMode = If(DirectCast(sender, CheckEdit).Checked, PivotSortMode.Custom, PivotSortMode.Default)
    End Sub
    Private Sub pivotGridControl1_CustomFieldSort(ByVal sender As Object, ByVal e As PivotGridCustomFieldSortEventArgs)
      If e.Field.FieldName = "Sales Person" Then
        If e.SortLocation = PivotSortLocation.Pivot Then
          Dim orderValue1 As Object = e.GetListSourceColumnValue(e.ListSourceRowIndex1, "Last Name"), orderValue2 As Object = e.GetListSourceColumnValue(e.ListSourceRowIndex2, "Last Name")
          e.Result = Comparer.Default.Compare(orderValue1, orderValue2)
        Else
          e.Result = Comparer.Default.Compare(e.Value1.ToString().Split(" "c)(1), e.Value2.ToString().Split(" "c)(1))
        End If
        e.Handled = True
      End If
    End Sub
  End Class
End Namespace