I'm using AvalonDock and when closing the app, I save a xml file of the Layout. It works fine as long as my Anchorables are either not visible or docked. If I save a layout with a floating window I get a NullReferenceException
Here is my Xaml:
<xcad:DockingManager x:Name="DockManager" Grid.Row="1"
AllowMixedOrientation="True"
BorderBrush="Black"
BorderThickness="1"
>
<xcad:DockingManager.DocumentHeaderTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Image Source="{Binding IconSource}" Margin="0,0,4,0"/>
<TextBlock Text="{Binding Title}" />
</StackPanel>
</DataTemplate>
</xcad:DockingManager.DocumentHeaderTemplate>
<xcad:LayoutRoot x:Name="_layoutRoot">
<xcad:LayoutPanel Orientation="Horizontal">
<xcad:LayoutAnchorablePaneGroup x:Name="Container" DockWidth="4*">
<xcad:LayoutAnchorablePane x:Name="Filter_Pane" DockWidth="1*">
<xcad:LayoutAnchorable x:Name="Filter" Title="Filter" AutoHideWidth="240" AutoHideMinWidth="500" AutoHideMinHeight="200" FloatingHeight="400" FloatingWidth="300" CanFloat="True" FloatingLeft="300" FloatingTop="200" >
<Grid x:Name="Filter_Grid" >
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition Height="50"/>
</Grid.RowDefinitions>
<StackPanel Grid.Row="0" x:Name="StackPanel_Filter" />
<StackPanel Orientation="Horizontal" Grid.Row="1" x:Name="Filter_Buttons">
<Button x:Name="Filter_btn_Apply" Content="Apply" Width="60" Height="22" VerticalAlignment="Bottom" HorizontalAlignment="Center" Margin="5,0,5,5"/>
<Button x:Name="Filter_btn_Clear" Content="Clear" Width="60" Height="22" VerticalAlignment="Bottom" HorizontalAlignment="Center" Margin="5,0,5,5" Click="Filter_btn_Clear_Click"/>
<Button x:Name="Filter_btn_Close" Content="Close" Width="60" Height="22" VerticalAlignment="Bottom" HorizontalAlignment="Center" Margin="5,0,5,5" Click="Filter_btn_Close_Click"/>
</StackPanel>
</Grid>
</xcad:LayoutAnchorable>
</xcad:LayoutAnchorablePane>
<xcad:LayoutAnchorablePane x:Name="DataGrid_Pane" DockWidth="4*" >
<xcad:LayoutAnchorable>
<DataGrid AutoGenerateColumns="True" x:Name="Datagrid_A" Margin="0,-18,0,0" MinColumnWidth="50" MinRowHeight="15" RowBackground="White" AlternatingRowBackground="#FFF0F0F0" AutoGeneratedColumns="Datagrid_A_AutoGeneratedColumns" ColumnHeaderHeight="30" AreRowDetailsFrozen="True" HorizontalGridLinesBrush="#FFB4B4B4" VerticalGridLinesBrush="#FFB4B4B4" Loaded="Datagrid_A_Loaded">
<DataGrid.Resources>
<Style TargetType="DataGridRow">
<EventSetter Event="MouseDoubleClick" Handler="Row_DoubleClick"/>
</Style>
<Style TargetType="DataGridCell">
<Style.Triggers>
<Trigger Property="DataGridCell.IsSelected" Value="True">
<Setter Property="Background" Value="Blue" />
</Trigger>
</Style.Triggers>
</Style>
<Style BasedOn="{StaticResource {x:Type DataGridColumnHeader}}" TargetType="{x:Type DataGridColumnHeader}">
<Setter Property="Background" Value="#FFCDCDD1" />
<Setter Property="BorderBrush" Value="#FFB4B4B4"/>
<Setter Property="BorderThickness" Value="0,0,1,0"/>
<Setter Property="FontWeight" Value="Bold"/>
<Setter Property="HorizontalAlignment" Value="Stretch"/>
</Style>
</DataGrid.Resources>
<DataGrid.Columns>
<DataGridTextColumn Header="" Width="*"></DataGridTextColumn>
</DataGrid.Columns>
</DataGrid>
</xcad:LayoutAnchorable>
</xcad:LayoutAnchorablePane>
</xcad:LayoutAnchorablePaneGroup>
<xcad:LayoutAnchorablePaneGroup x:Name="Hidden_Windows" DockWidth="1*" >
<xcad:LayoutAnchorablePane x:Name="Pane_Edit">
<xcad:LayoutAnchorable x:Name="Edit" Title="Edit" FloatingHeight="300" FloatingWidth="445" FloatingLeft="1000" FloatingTop="500">
<Grid x:Name="Edit_Grid" >
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<StackPanel x:Name="StackPanel_Edit" Grid.Row="0" />
<StackPanel x:Name="Edit_Buttons" Orientation="Horizontal" Grid.Row="1" Height="35" VerticalAlignment="Bottom">
<Button Content="Close" Click="Button_Click_1" Width="75" Height="30" VerticalAlignment="Bottom" HorizontalAlignment="Center" Margin="5,0,5,5"/>
<Button Content="<-" HorizontalAlignment="Center" VerticalAlignment="Bottom" Height="30" Width="30" Click="Button_Click_4" Margin="5,0,5,5"/>
<Button Content="->" HorizontalAlignment="Center" VerticalAlignment="Bottom" Height="30" Width="30" Click="Button_Click_5" Margin="5,0,5,5"/>
<Button x:Name="Btn_Edit_Save" Margin="5,-3,5,5" HorizontalAlignment="Center" Width="75" Height="30" VerticalAlignment="Bottom">
<StackPanel Orientation="Horizontal">
<TextBlock Height="21"><Run Text="Save"/></TextBlock>
<Image Source="/resources/save.png" Height="24" Width="25"/>
</StackPanel>
</Button>
<Button x:Name="btn_Edit_Add" HorizontalAlignment="Center" Margin="5,0,5,5" VerticalAlignment="Bottom" Width="75" Height="30" Click="Button_Add_Click">
<StackPanel Orientation="Horizontal">
<TextBlock Width="24"><Run Text="Add"/></TextBlock>
<Image Source="/resources/Add.png" Height="20" Width="20"/>
</StackPanel>
</Button>
<Button x:Name="btn_Edit_Delete" Margin="5,0,5,5" Height="30" HorizontalAlignment="Center" Width="75" VerticalAlignment="Bottom">
<StackPanel Orientation="Horizontal">
<TextBlock Width="38"><Run Text="Delete"/></TextBlock>
<Image Source="/resources/delete.png" Height="20" Width="25"/>
</StackPanel>
</Button>
</StackPanel>
</Grid>
</xcad:LayoutAnchorable>
</xcad:LayoutAnchorablePane>
<xcad:LayoutAnchorablePane x:Name="Pane_Add">
<xcad:LayoutAnchorable x:Name="Add" Title="Add" FloatingHeight="300" FloatingWidth="445" FloatingLeft="1000" FloatingTop="500" >
<Grid x:Name="Add_Grid" Margin="0,1,-1,-2">
<StackPanel x:Name="StackPanel_Add" Margin="0,0,0,37"/>
<Button Content="Button" Margin="116,0,10,10" Height="22" VerticalAlignment="Bottom" HorizontalAlignment="Center" Width="74"/>
<Button x:Name="Btn_Exit_Add" Content="Exit" Margin="10,0,115,10" Height="22" VerticalAlignment="Bottom" Click="Btn_Exit_Add_Click" HorizontalAlignment="Center" Width="75"/>
</Grid>
</xcad:LayoutAnchorable>
</xcad:LayoutAnchorablePane>
</xcad:LayoutAnchorablePaneGroup>
</xcad:LayoutPanel>
</xcad:LayoutRoot>
</xcad:DockingManager>
this is how I handle the layout save and load:
//Save windwos' Layout on Close
private void Window_Closed(object sender, EventArgs e)
{
XmlLayoutSerializer layoutSerializer = new
XmlLayoutSerializer(DockManager);
using (var writer = new StreamWriter("WindowLayout.xml"))
{
layoutSerializer.Serialize(writer);
}
}
//Load Window Layout on Load
private void Window_Loaded(object sender, RoutedEventArgs e)
{
if (File.Exists("WindowLayout.xml"))
{
XmlLayoutSerializer layoutSerializer = new XmlLayoutSerializer(DockManager);
StreamReader reader = new StreamReader("WindowLayout.xml");
if (reader != null)
{
layoutSerializer.Deserialize(reader);
}
}
}
And this is the output of the Serialization :
<?xml version="1.0" encoding="utf-8"?>
<LayoutRoot>
<RootPanel Orientation="Horizontal">
<LayoutAnchorablePaneGroup Orientation="Horizontal" DockWidth="4*">
<LayoutAnchorablePane Id="21c8177e-4045-4884-a576-22d096e1e9fa" />
<LayoutAnchorablePane DockWidth="4*">
<LayoutAnchorable AutoHideMinWidth="100" AutoHideMinHeight="100" IsSelected="True" ContentId="Datagrid_A" CanClose="False" />
</LayoutAnchorablePane>
</LayoutAnchorablePaneGroup>
<LayoutAnchorablePaneGroup Orientation="Horizontal">
<LayoutAnchorablePane Id="4fb678e1-2fb1-4041-82ed-7350fb2dea7a" />
<LayoutAnchorablePane Id="04694aaf-fdb8-4520-ac4c-91cb5f20bd96" />
</LayoutAnchorablePaneGroup>
</RootPanel>
<TopSide />
<RightSide />
<LeftSide />
<BottomSide />
<FloatingWindows>
<LayoutAnchorableFloatingWindow>
<LayoutAnchorablePaneGroup Orientation="Horizontal" FloatingWidth="300" FloatingHeight="400" FloatingLeft="300" FloatingTop="200">
<LayoutAnchorablePane FloatingWidth="300" FloatingHeight="400" FloatingLeft="300" FloatingTop="200">
<LayoutAnchorable AutoHideWidth="240" AutoHideMinWidth="500" AutoHideMinHeight="200" Title="Filter" IsSelected="True" ContentId="Filter_Grid" FloatingLeft="300" FloatingTop="200" FloatingWidth="300" FloatingHeight="400" CanClose="False" LastActivationTimeStamp="03/25/2019 11:16:53" PreviousContainerId="21c8177e-4045-4884-a576-22d096e1e9fa" PreviousContainerIndex="0" />
</LayoutAnchorablePane>
</LayoutAnchorablePaneGroup>
</LayoutAnchorableFloatingWindow>
</FloatingWindows>
<Hidden>
<LayoutAnchorable AutoHideMinWidth="100" AutoHideMinHeight="100" Title="Add" ContentId="Add_Grid" FloatingLeft="1000" FloatingTop="500" FloatingWidth="445" FloatingHeight="300" CanClose="False" PreviousContainerId="04694aaf-fdb8-4520-ac4c-91cb5f20bd96" PreviousContainerIndex="0" />
<LayoutAnchorable AutoHideMinWidth="100" AutoHideMinHeight="100" Title="Edit" ContentId="Edit_Grid" FloatingLeft="1000" FloatingTop="500" FloatingWidth="445" FloatingHeight="300" CanClose="False" PreviousContainerId="4fb678e1-2fb1-4041-82ed-7350fb2dea7a" PreviousContainerIndex="0" />
</Hidden>
</LayoutRoot>
thank you for your help
