DataControlSerializationOptions.RemoveOldColumns Attached Property

Gets or sets whether the columns that exist in a layout when it is restored but do not currently exist in the grid, should be discarded. This is a dependency property.

Namespace: DevExpress.Xpf.Grid

Assembly: DevExpress.Xpf.Grid.v20.2.Core.dll

NuGet Packages: DevExpress.WindowsDesktop.Wpf.Grid.Core, DevExpress.Wpf.Grid.Core

Declaration

See GetRemoveOldColumns(DependencyObject) and SetRemoveOldColumns(DependencyObject, Boolean).

Returns

Type	Description
Boolean	true to discard the columns that exist in the layout being restored but do not currently exist in the grid; false to add these columns to the grid.

Remarks

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

To learn more, see Saving and Restoring Layout.

Example

This example shows how to save the grid layout to a memory stream. To do this, click the ‘Save Layout’ button. Once saved, the grid layout can then be restored by clicking the ‘Restore Layout’ button.

View Example

MainPage.xaml

<UserControl x:Class="DXGrid_GridLayout.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400"
    xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core" 
    xmlns:dxg="http://schemas.devexpress.com/winfx/2008/xaml/grid" 
    xmlns:local="clr-namespace:DXGrid_GridLayout" >

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <dxg:GridControl x:Name="grid" dx:DXSerializer.SerializationID="grid" 
                         dx:DXSerializer.StoreLayoutMode="All" 
                         dxg:GridSerializationOptions.AddNewColumns="False" 
                         dxg:GridSerializationOptions.RemoveOldColumns="False">
            <dxg:GridControl.Columns>
                <dxg:GridColumn x:Name="colIssueName" FieldName="IssueName" />
                <dxg:GridColumn x:Name="colIssueType" FieldName="IssueType" />
                <dxg:GridColumn x:Name="colPrivate" FieldName="IsPrivate">Private</dxg:GridColumn>
            </dxg:GridControl.Columns>
            <dxg:GridControl.View>
                <dxg:TableView AutoWidth="True" />
            </dxg:GridControl.View>
        </dxg:GridControl>

        <StackPanel Grid.Row="1" Orientation="Vertical">
            <StackPanel Orientation="Horizontal">
                <Button Margin="1" Click="Button_Click">AddNewColumn</Button>
            </StackPanel>
            <StackPanel Orientation="Horizontal">
                <Button Margin="1" Click="SaveButton_Click">Save Layout</Button>
                <Button x:Name="restoreButton" Margin="1" 
                        Click="LoadButton_Click" IsEnabled="{Binding IsLayoutSaved}">
                        Restore Layout
                </Button>
            </StackPanel>
        </StackPanel>
    </Grid>
</UserControl>

MainPage.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.IO;

namespace DXGrid_GridLayout {
    public partial class MainPage : UserControl {
        public static readonly DependencyProperty IsLayoutSavedProperty =
            DependencyProperty.Register("IsLayoutSaved", typeof(bool), typeof(MainPage), null);
        public bool IsLayoutSaved {
            get { return (bool)GetValue(IsLayoutSavedProperty); }
            set { SetValue(IsLayoutSavedProperty, value); }
        }
        MemoryStream layoutStream;
        public MainPage() {
            DataContext = this;
            InitializeComponent();
            IsLayoutSaved = false;
            grid.ItemsSource = IssueList.GetData();
        }

        private void SaveButton_Click(object sender, RoutedEventArgs e) {
            layoutStream = new MemoryStream();
            grid.SaveLayoutToStream(layoutStream);
            IsLayoutSaved = true;
        }
        private void LoadButton_Click(object sender, RoutedEventArgs e) {
            layoutStream.Position = 0;
            grid.RestoreLayoutFromStream(layoutStream);
        }
        private void Button_Click(object sender, RoutedEventArgs e) {
            grid.Columns.Add(new DevExpress.Xpf.Grid.GridColumn() { FieldName = "IsPrivate" });
        }
    }
    public class IssueList {
        static public List<IssueDataObject> GetData() {
            List<IssueDataObject> data = new List<IssueDataObject>();
            data.Add(new IssueDataObject() {
                IssueName = "Transaction History",
                IssueType = "Bug", IsPrivate = true
            });
            data.Add(new IssueDataObject() {
                IssueName = "Ledger: Inconsistency",
                IssueType = "Bug", IsPrivate = false
            });
            data.Add(new IssueDataObject() {
                IssueName = "Data Import",
                IssueType = "Request", IsPrivate = false
            });
            data.Add(new IssueDataObject() {
                IssueName = "Data Archiving",
                IssueType = "Request", IsPrivate = true
            });
            return data;
        }
    }

    public class IssueDataObject {
        public string IssueName { get; set; }
        public string IssueType { get; set; }
        public bool IsPrivate { get; set; }
    }
}

MainPage.xaml.vb

Imports System
Imports System.Collections.Generic
Imports System.Linq
Imports System.Net
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Documents
Imports System.Windows.Input
Imports System.Windows.Media
Imports System.Windows.Media.Animation
Imports System.Windows.Shapes
Imports System.IO

Namespace DXGrid_GridLayout
    Partial Public Class MainPage
        Inherits UserControl

        Public Shared ReadOnly IsLayoutSavedProperty As DependencyProperty = 
            DependencyProperty.Register("IsLayoutSaved", GetType(Boolean), GetType(MainPage), Nothing)
        Public Property IsLayoutSaved() As Boolean
            Get
                Return DirectCast(GetValue(IsLayoutSavedProperty), Boolean)
            End Get
            Set(ByVal value As Boolean)
                SetValue(IsLayoutSavedProperty, value)
            End Set
        End Property
        Private layoutStream As MemoryStream
        Public Sub New()
            DataContext = Me
            InitializeComponent()
            IsLayoutSaved = False
            grid.ItemsSource = IssueList.GetData()
        End Sub

        Private Sub SaveButton_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
            layoutStream = New MemoryStream()
            grid.SaveLayoutToStream(layoutStream)
            IsLayoutSaved = True
        End Sub
        Private Sub LoadButton_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
            layoutStream.Position = 0
            grid.RestoreLayoutFromStream(layoutStream)
        End Sub
        Private Sub Button_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
            grid.Columns.Add(New DevExpress.Xpf.Grid.GridColumn() With {.FieldName = "IsPrivate"})
        End Sub
    End Class
    Public Class IssueList
        Public Shared Function GetData() As List(Of IssueDataObject)
            Dim data As New List(Of IssueDataObject)()
            data.Add(New IssueDataObject() With {.IssueName = "Transaction History", .IssueType = "Bug", .IsPrivate = True})
            data.Add(New IssueDataObject() With {.IssueName = "Ledger: Inconsistency", .IssueType = "Bug", .IsPrivate = False})
            data.Add(New IssueDataObject() With {.IssueName = "Data Import", .IssueType = "Request", .IsPrivate = False})
            data.Add(New IssueDataObject() With {.IssueName = "Data Archiving", .IssueType = "Request", .IsPrivate = True})
            Return data
        End Function
    End Class

    Public Class IssueDataObject
        Public Property IssueName() As String
        Public Property IssueType() As String
        Public Property IsPrivate() As Boolean
    End Class
End Namespace