CODEWITHSUNDEEP
c#winformsdata-bindingdatagridviewobservablecollection
ProfK
ProfK

Reputation: 51114

Why is my ObservableCollection<T> not observed by my DataGridView?

I have to resort to the viewmodel firing an event, and on catching that event, refreshing the whole grid. What is the point of something observable when it's not observed?

This is how may main form starts up, first populating the grid, and repopulating it every time something is added to the collection:

private void MainForm_Load(object sender, EventArgs e)
{
    FoundFilesBindingSource.DataSource = ViewModel;

    // TODO Try get rid of event model.
    ViewModel.FilesFound += (o, args) =>
    {
        if (FileInfosGrid.InvokeRequired)
        {
            FileInfosGrid.Invoke(new Action(() => FileInfosGrid.DataSource = ViewModel.FileInfos));
        }
        else
        {
            FileInfosGrid.DataSource = ViewModel.FileInfos;
        }
    };
}

On class ViewModel, FileInfos is declared as:

public ObservableCollection<FindMatchViewModel> FileInfos { get; set; }

Upvotes: 0

Views: 493

Answers (1)

Sebi
Sebi

Reputation: 3979

The ObservableCollection isn't working for a dataGridView because it doesn't implement IBindingList. You have to use a BindingList instead. Make sure that your items implement INotifyPropertyChanged if you want to reflect changes to your properties.

The problem is that ObservableCollection is designed for Wpf Controls.

Notice that a BindingList doesn't support sorting or filter your data and reflect this. This behaviour is only supported by DataTable or custom List implementations.

Upvotes: 3

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