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C#•2y ago•
4 replies
Nacho Man Randy Cabbage

Binding DataGrid to DataTable. DataGrid's ItemSource is null on first load. - WPF

I'm trying to bind a DataGrid to a DataTable located in my viewmodel. The columns are dynamic hence why I'm binding to a DataTable and adding the columns and rows in the viewmodel. The relevant VM code looks like:

private DataTable _data;
public DataTable Data
{
    get => _data;
    set
    {
        _data = value;
        OnPropertyChanged();
    }
}

// called in VM's constructor. Also tried calling it in the view's code-behind in loaded event.
public void LoadData()
{
    Data = new DataTable();
    Data.BeginLoadData();

    // adding columns using Data.Columns.Add
    // adding rows using Data.Rows.Add

    Data.EndLoadData();
}


Now the viewmodel is created before the view, and the view's datacontext is set to the viewmodel when the view is created.
The xaml for the DataGrid is:
<DataGrid
    x:Name="AttributesGrid"
    IsReadOnly="True"
    ItemsSource="{Binding Data, IsAsync=True}"/>


There are certain columns I need to hide based on a list of strings in the VM. So I checked in both the View's Loaded event and the DataGrid's Loaded event, and in both cases the ItemSource is null, so I can't access the columns to hide them. Why would it be null if it is bound to the DataTable in the vm?
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