C#•3mo ago

✅ Stylet MVVM OnInitialActivate isn't called

I want to add subdirectories to Items collection and display them in TreeView on view loading, I tried OnInitialActivate, but method isn't executed. Is there any solution?

public class NavigationPaneViewModel : Screen
{
    public BindableCollection<NavigationPaneItem> Items { get; set; }

    protected override void OnInitialActivate()
    {
        base.OnInitialActivate();
        Items.Clear();
        Items.AddRange(GetSubDirectories(_path));
    }
    ...
}

public class NavigationPaneViewModel : Screen
{
    public BindableCollection<NavigationPaneItem> Items { get; set; }

    protected override void OnInitialActivate()
    {
        base.OnInitialActivate();
        Items.Clear();
        Items.AddRange(GetSubDirectories(_path));
    }
    ...
}

NavigationPaneView

<UserControl x:Class="Explorer.Views.NavigationPaneView"
              ...
             mc:Ignorable="d" 
             d:DataContext="{d:DesignInstance Type=viewModels:NavigationPaneViewModel, IsDesignTimeCreatable=false}"
             d:DesignHeight="450" d:DesignWidth="250">
    <DockPanel>
        <TreeView ItemsSource="{Binding Items}">
            <TreeView.Resources>
                <HierarchicalDataTemplate 
                    DataType="{x:Type models:NavigationPaneItem}" 
                    ItemsSource="{Binding Children}"
                    >
                    <TextBlock Text="{Binding Name}"/>
                </HierarchicalDataTemplate>
            </TreeView.Resources>
        </TreeView>
    </DockPanel>
</UserControl>

<UserControl x:Class="Explorer.Views.NavigationPaneView"
              ...
             mc:Ignorable="d" 
             d:DataContext="{d:DesignInstance Type=viewModels:NavigationPaneViewModel, IsDesignTimeCreatable=false}"
             d:DesignHeight="450" d:DesignWidth="250">
    <DockPanel>
        <TreeView ItemsSource="{Binding Items}">
            <TreeView.Resources>
                <HierarchicalDataTemplate 
                    DataType="{x:Type models:NavigationPaneItem}" 
                    ItemsSource="{Binding Children}"
                    >
                    <TextBlock Text="{Binding Name}"/>
                </HierarchicalDataTemplate>
            </TreeView.Resources>
        </TreeView>
    </DockPanel>
</UserControl>

ShellView

<Window x:Class="Explorer.Views.ShellView"
        ...
        d:DataContext="{d:DesignInstance Type=viewModels:ShellViewModel, IsDesignTimeCreatable=False}"
        Title="{Binding Title}" Height="450" Width="960">
    <DockPanel>
        <Grid>
            ...
            <ContentControl s:View.Model="{Binding NavigationPane}" Grid.Column="0" Padding="0,5"/>
            <GridSplitter Grid.Column="1" Width="1" Background="Transparent"/>
            <views:ContentPaneView Grid.Column="2"/>
        </Grid>
    </DockPanel>
</Window>

<Window x:Class="Explorer.Views.ShellView"
        ...
        d:DataContext="{d:DesignInstance Type=viewModels:ShellViewModel, IsDesignTimeCreatable=False}"
        Title="{Binding Title}" Height="450" Width="960">
    <DockPanel>
        <Grid>
            ...
            <ContentControl s:View.Model="{Binding NavigationPane}" Grid.Column="0" Padding="0,5"/>
            <GridSplitter Grid.Column="1" Width="1" Background="Transparent"/>
            <views:ContentPaneView Grid.Column="2"/>
        </Grid>
    </DockPanel>
</Window>

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✅ Stylet MVVM OnInitialActivate isn't called