Data Grid - The OptimizedMultipleSelectionChanged event has become asynchronous

In v19.2, we introduced a new API to bind the DxDataGrid component to data asynchronously. The previous synchronous version of the OptimizedMultipleSelectionChanged event would not work with asynchronous data binding. For this reason, we made this event asynchronous and no longer support the synchronous version.

The event's signature has been updated as follows:

Old:

Code
public Action<DataGridSelection<T>> OptimizedMultipleSelectionChanged { get; set; }

New:

Code
public Func<DataGridSelection<T>, Task> OptimizedMultipleSelectionChanged { get; set; }

The SelectedKeys and SelectedKeysMatchingFilter properties of the DataGridSelection class have also become asynchronous.

Old:

Code
public IEnumerable<object> SelectedKeys { get; }
public IEnumerable<object> SelectedKeysMatchingFilter { get; }

New:

Code
public Task<IEnumerable<object>> SelectedKeys { get; }
public Task<IEnumerable<object>> SelectedKeysMatchingFilter { get; }

If you handled the OptimizedMultipleSelectionChanged event, update the handler implementation similarly to the code below.

Old:

Code
<DxDataGrid Data="@DataSource"
    KeyFieldName="Id"
    SelectionMode="DataGridSelectionMode.OptimizedMultipleSelection"  
    OptimizedMultipleSelectionChanged="OnSelectionChanged">  
    ...  
</DxDataGrid>  

@code {  
    protected void OnSelectionChanged(DataGridSelection<ProductFlat> selection)  
    {  
        ... 
        var selectedCount = selection.SelectedKeys.Count();
        ...
    }  
}  

New:

Code
<DxDataGrid Data="@DataSource"
    KeyFieldName="Id"
    SelectionMode="DataGridSelectionMode.OptimizedMultipleSelection"  
    OptimizedMultipleSelectionChanged="OnSelectionChanged">  
    ...  
</DxDataGrid>  

@code {  
    protected async Task OnSelectionChanged(DataGridSelection<ProductFlat> selection)  
    {  
        ...  
        var selectedKeys = await selection.SelectedKeys;  
        var selectedCount = selectedKeys.Count(); 
        ...
    }  
}