AvalonDock: NullReferenceException when restoring state

[rabjen-iwes]

#44499 |

I have not yet tried the quick fix for the non-working tab titles on anchorables, so I don’t know if this is related to this.

I took the AvalonDockLayoutSerializer from this tutorial on CodeProject, where the serialization boils down to this:

            using(StringWriter fs = new StringWriter()) {
                XmlLayoutSerializer xmlLayout = new XmlLayoutSerializer(frameworkElement);

                xmlLayout.Serialize(fs);

                xmlLayoutString = fs.ToString();
            }

then, the xmlLayoutString is passed to a command where I save it.

So far so good. When I try to load it again with this part of code I added:

        public static void LoadLayout(this DockingManager dm, string layoutXml) {
            using(var sr = new StringReader(layoutXml)) {
                var ser = new XmlLayoutSerializer(dm);
                ser.Deserialize(sr);
            }
        }

I get a NullReferenceException on the Deserialize command.

Am I missing something or is this another bug?

[Fawzi [Xceed]]

#44501

Hi,

We don’t have a sample to test your scenario, but make sure you have set the ContentId property for your LayoutDocuments and LayoutAnchorables. This is necessary in order for deserialization to work.
Ex :

<dock:DockingManager x:Name=”myDM”
DataContext=”{StaticResource ViewModel}”
AnchorablesSource=”{Binding Pages}”>
<dock:DockingManager.LayoutItemContainerStyle>
<!– you can add additional bindings from the layoutitem to the DockWindowViewModel –>
<Style TargetType=”{x:Type dockctrl:LayoutItem}”>
<Setter Property=”Title”
Value=”{Binding Model.Title}” />
<Setter Property=”ContentId”
Value=”{Binding Model.Title}” />
</Style>
</dock:DockingManager.LayoutItemContainerStyle>
</dock:DockingManager>

[rabjen-iwes]

#44502

Thanks, I actually forgot this… I will test this ASAP.

[rabjen-iwes]

#44503

Followup: After I removed the custom LayoutUpdateStrategy and the default Layout, this works. Thanks for the help 🙂

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