线程安全的CollectionViewSource

Question

I've been using Caliburn.Micro's BindableCollection to render the data for Telerik RadGridView and it's thread-safe which means I can update the collection from the non-UI thread.

Now what I am trying to do is to filter the datagrid using a predicate. The nature thought is to use CollectionViewSource so that my underlying data does not change and I can control the CollectionViewSource's view by applying predicate on it. The issue is CollectionViewSource is not thread-safe and will throw if the source updated from non-UI thread.

Here below is the XAML and view model.

XAML:

        <controls:RadGridView Grid.Column="2"
                          AutoGenerateColumns="False"
                          behaviours:RadGridViewExtensions.RowDoubleClick="OpenProgram"
                          CanUserDeleteRows="False"
                          CanUserInsertRows="False"
                          DataContext="{Binding ContractHeadersCollectionView}"
                          IsReadOnly="True"
                          ItemsSource="{Binding}"
                          RowIndicatorVisibility="Collapsed"
                          SelectedItem="{Binding SelectedContractHeader}"
                          SelectionMode="Single"/>

View Model:

    /// <summary>
    /// Initialises a new instance of the <see cref="PortfolioViewModel"/> class.
    /// </summary>
    public PortfolioViewModel()
    {
        this.ContractHeaders = new BindableCollection<ContractHeaderViewModel>();
        this.ContractHeadersCollectionView = new CollectionViewSource() { Source = ContractHeaders };
    }

    public CollectionViewSource ContractHeadersCollectionView { get; private set; }

The questions are:

1. Does Calibun.Micro provide a thread-safe CollectionViewSource equivalent?
2. If not, what's the option if I don't want marshal the calls to update BindableCollection to the UI thread?

Thanks for any thoughts or suggestions.

Answer 1

You need to marshal calls to the UI thread. Caliburn.Micro provides Execute.OnUiThread in Caliburn.Micro for marshalling calls to the UI Thread.