PivotSerializationOptions.RemoveOldFields Attached Property

Gets or sets whether the fields that exist in a layout when it is restored, but don’t currently exist in the PivotGrid, should be discarded. This is an attached property.

Namespace: DevExpress.Xpf.PivotGrid

Assembly: DevExpress.Xpf.PivotGrid.v19.2.dll

Declaration

See GetRemoveOldFields(DependencyObject) and SetRemoveOldFields(DependencyObject, Boolean).

Returns

Type	Description
Boolean	true to discard the fields that exist in the layout being restored but don’t currently exist in the PivotGrid; otherwise, false.

Remarks

The RemoveOldFields option affects how the PivotGrid’s layout is restored. If it is set to true, the fields that exist in the layout being loaded, but do not exist in the grid, will not be re-created. Otherwise, these fields will be added to the PivotGrid.

To learn more, see Save and Restore Layout.

Example

This example shows how to save (or restore) the PivotGridControl‘s data and layout to a file. To correctly restore fields if the pivot grid’s PivotGridControl.Fields collection is empty, the PivotSerializationOptions.RemoveOldFields property should be set to false.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-work-with-the-dxpivotgrid-control-offline-e2124.

MainWindow.xaml.vb

Imports Microsoft.VisualBasic
Imports System.Data
Imports System.Data.OleDb
Imports System.Windows
Imports DevExpress.Xpf.PivotGrid
Imports HowToBindToMDB.NwindDataSetTableAdapters
Imports System.IO
Imports DevExpress.Xpf.Core

Namespace HowToBindToMDB
    ''' <summary>
    ''' Interaction logic for MainWindow.xaml
    ''' </summary>
    Partial Public Class MainWindow
        Inherits Window
        Private salesPersonDataTable As New NwindDataSet.SalesPersonDataTable()
        Private salesPersonDataAdapter As New SalesPersonTableAdapter()

        Public Sub New()
            InitializeComponent()
            pivotGridControl1.DataSource = salesPersonDataTable
        End Sub

        Private Sub Window_Loaded(ByVal sender As Object, ByVal e As RoutedEventArgs)
            salesPersonDataAdapter.Fill(salesPersonDataTable)
        End Sub

        Private Sub button1_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
            pivotGridControl1.SavePivotGridToFile("pivot.dat", True)
            pivotGridControl1.DataSource = Nothing
            pivotGridControl1.Fields.Clear()
        End Sub

        Private Sub button2_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
            If (Not File.Exists("pivot.dat")) Then
                DXMessageBox.Show("You should save the PivotGrid into a file first")
                Return
            End If
            pivotGridControl1.RestorePivotGridFromFile("pivot.dat")
        End Sub
    End Class
End Namespace

MainWindow.xaml

<Window x:Class="HowToBindToMDB.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:dxpg="http://schemas.devexpress.com/winfx/2008/xaml/pivotgrid"
        Title="MainWindow" Height="350" Width="525"  Loaded="Window_Loaded">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <dxpg:PivotGridControl dxpg:PivotSerializationOptions.RemoveOldFields="False"
                               HorizontalAlignment="Left" Name="pivotGridControl1" 
                               VerticalAlignment="Top" Margin="0,0,0,8">
            <dxpg:PivotGridControl.Fields>
                <dxpg:PivotGridField Name="fieldCountry" FieldName="Country" Area="RowArea" />
                <dxpg:PivotGridField Name="fieldCustomer" FieldName="Sales Person" Area="RowArea" 
                                     Caption="Customer" />
                <dxpg:PivotGridField Name="fieldYear" FieldName="OrderDate" Area="ColumnArea" 
                                     Caption="Year" GroupInterval="DateYear" />
                <dxpg:PivotGridField Name="fieldCategoryName" FieldName="CategoryName" 
                                     Area="ColumnArea" Caption="Product Category" />
                <dxpg:PivotGridField Name="fieldProductName" FieldName="ProductName" 
                                     Area="FilterArea" Caption="Product Name" />
                <dxpg:PivotGridField Name="fieldExtendedPrice" FieldName="Extended Price" 
                                     Area="DataArea" CellFormat="c0" />
            </dxpg:PivotGridControl.Fields>
        </dxpg:PivotGridControl>
        <StackPanel Orientation="Horizontal" Grid.Row="1">
            <Button Content="Save and unbind" Height="23" Name="button1" 
                    Grid.Row="1" Click="button1_Click" 
                    Margin="0,0,8,0" Padding="8,0,8,0" />
            <Button Content="Restore" Height="23" Name="button2" 
                    Grid.Row="1" Grid.Column="1" 
                    Click="button2_Click" 
                    Padding="8,0,8,0" />
        </StackPanel>        
    </Grid>
</Window>

MainWindow.xaml.cs

using System.Data;
using System.Data.OleDb;
using System.Windows;
using DevExpress.Xpf.PivotGrid;
using HowToBindToMDB.NwindDataSetTableAdapters;
using System.IO;
using DevExpress.Xpf.Core;

namespace HowToBindToMDB {
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window {
        NwindDataSet.SalesPersonDataTable salesPersonDataTable = new NwindDataSet.SalesPersonDataTable();
        SalesPersonTableAdapter salesPersonDataAdapter = new SalesPersonTableAdapter();

        public MainWindow() {
            InitializeComponent();
            pivotGridControl1.DataSource = salesPersonDataTable;
        }

        private void Window_Loaded(object sender, RoutedEventArgs e) {
            salesPersonDataAdapter.Fill(salesPersonDataTable);
        }

        private void button1_Click(object sender, RoutedEventArgs e) {
            pivotGridControl1.SavePivotGridToFile("pivot.dat", true);
            pivotGridControl1.DataSource = null;
            pivotGridControl1.Fields.Clear();
        }

        private void button2_Click(object sender, RoutedEventArgs e) {
            if(!File.Exists("pivot.dat")) {
                DXMessageBox.Show("You should save the PivotGrid into a file first");
                return;
            }
            pivotGridControl1.RestorePivotGridFromFile("pivot.dat");
        }
    }
}