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.v23.2.Core.dll

NuGet Package: 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 GridControl‘s layout to a memory stream. To do this, click the Save Layout button. Click the Restore Layout button to restore the saved layout.

View Example: Save Layout and Restore It from a Memory Stream

XAML

<dxg:GridControl x:Name="grid"
                 dx:DXSerializer.StoreLayoutMode="All" 
                 dxg:GridSerializationOptions.AddNewColumns="False" 
                 dxg:GridSerializationOptions.RemoveOldColumns="False"
                 UseFieldNameForSerialization="True">
    <dxg:GridColumn FieldName="IssueName"/>
    <dxg:GridColumn FieldName="IssueType"/>
    <dxg:GridColumn FieldName="IsPrivate" Header="Private"/>
    <dxg:GridControl.View>
        <dxg:TableView AutoWidth="True"/>
    </dxg:GridControl.View>
</dxg:GridControl>

<StackPanel Grid.Row="1" Orientation="Vertical">
    <StackPanel Orientation="Horizontal">
        <Button Margin="1" Content="Add a New Column" Click="OnAddNewColumn"/>
    </StackPanel>
    <StackPanel Orientation="Horizontal">
        <Button Content="Save Layout" Margin="1" Click="OnSaveLayout"/>
        <Button Content="Restore Layout" Margin="1" Click="OnRestoreLayout"/>
    </StackPanel>
</StackPanel>

C#

public partial class Window1 : Window {
    MemoryStream layoutStream;
    public Window1() {
        InitializeComponent();
        grid.ItemsSource = IssueList.GetData();
    }

    void OnSaveLayout(object sender, RoutedEventArgs e) {
        layoutStream = new MemoryStream();
        grid.SaveLayoutToStream(layoutStream);
    }
    void OnRestoreLayout(object sender, RoutedEventArgs e) {
        layoutStream.Position = 0;
        grid.RestoreLayoutFromStream(layoutStream);
    }
    void OnAddNewColumn(object sender, RoutedEventArgs e) {
        grid.Columns.Add(new DevExpress.Xpf.Grid.GridColumn() { FieldName = "IsPrivate" });
    }
}

VB.NET

Public Partial Class Window1
    Inherits Window

    Private layoutStream As MemoryStream

    Public Sub New()
        Me.InitializeComponent()
        Me.grid.ItemsSource = IssueList.GetData()
    End Sub

    Private Sub OnSaveLayout(ByVal sender As Object, ByVal e As RoutedEventArgs)
        layoutStream = New MemoryStream()
        Me.grid.SaveLayoutToStream(layoutStream)
    End Sub

    Private Sub OnRestoreLayout(ByVal sender As Object, ByVal e As RoutedEventArgs)
        layoutStream.Position = 0
        Me.grid.RestoreLayoutFromStream(layoutStream)
    End Sub

    Private Sub OnAddNewColumn(ByVal sender As Object, ByVal e As RoutedEventArgs)
        Me.grid.Columns.Add(New DevExpress.Xpf.Grid.GridColumn() With {.FieldName = "IsPrivate"})
    End Sub
End Class