DataGrid - Filtering for nulls or any string doesn't update the table

Radzen Studio Blazor Server
1

I have a DataGrid which is bound to a list of objects.
These contain objects that have a property CreatedDate
This is a date.
I want to filter "handled" (where date is not null) or "unhandled" where data is null

I added a filter template and created a drop down with these two values. The onchange event executes the following code.

While the data property of the grid is correct (it shows only 1 result), the grid continues to display the old data (10 results)!

The on changehandler has the following code:

async Task OnSelectedStatusChanged(object value)
{


    IList<BookingDetailsWarning> filteredData = BookingDetailsWarnings.Where(b => b.ClearedDateTime == null).ToList(); //temp hardcoded
     dataGrid.Data = filteredData;
    await dataGrid.Reload();

     StateHasChanged();
}

Any ideas why this isn't updating?
Is there a better approach?

2

Usually this is not the way to update it - you can simply update the collection assigned to Data property.

3

So I updated my code to do this, which I didn't expect to work since the linq will produce a new object

async Task OnSelectedStatusChanged(object value)
{

    myColumn.SetFilterValue(new DateTime());
    dataGrid.Data.Where(b => b.ClearedDateTime == null).ToList();
    await dataGrid.Reload();

       StateHasChanged();
}

This resulted an "System.NullReferenceException: 'Object reference not set to an instance of an object.'" when executing callback. Invoke(state) in RunFromThreadPoolDispatchLoop class!

4

Have you tried to debug your application? What’s null?

5

The details of the exception are:

This exception was originally thrown at this call stack:
Microsoft.AspNetCore.SignalR.ClientProxyExtensions.SendAsync(Microsoft.AspNetCore.SignalR.IClientProxy, string, object, object, object, System.Threading.CancellationToken)
Microsoft.AspNetCore.Components.Server.Circuits.RemoteJSRuntime.EndInvokeDotNet(Microsoft.JSInterop.Infrastructure.DotNetInvocationInfo, Microsoft.JSInterop.Infrastructure.DotNetInvocationResult)
Microsoft.JSInterop.Infrastructure.DotNetDispatcher.EndInvokeDotNetAfterTask(System.Threading.Tasks.Task, Microsoft.JSInterop.JSRuntime, Microsoft.JSInterop.Infrastructure.DotNetInvocationInfo)
System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(System.Threading.Thread, System.Threading.ExecutionContext, System.Threading.ContextCallback, object) in ExecutionContext.cs

This exception doesn't come from the OnSelectedStatusChanged event handler!

6

This is how every Blazor exception looks, if you need to know why this is raised you need to debug.

7

Sticking a breakpoint in the handler and stepping through, the code leaves the event handler and immediately just to this exception from RemoteJsRuntime!