Radzen Dialog service call throwing NullReference Exception

Radzen.Blazor Components
1

I am trying to call a radzen dialog razor page into a code-behind but getting a Null reference exception.
Kindly help

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2

Most probably the DialogService is not injected or registered properly. Check our demos and documentation for reference.

3

I've the same problem!

DialogService ist registered and injected in the same way as the NotificationService. The NotificationService works but the DialogService does not.

I'm using both Services in a RCL. Is this maybe the Problem?

4

Make sure RadzenDialog is part of your main layout - check our getting started page for reference.

5

Sure, RadzenDialog ist part of the MainLayout (stored in RCL).

I've checked your getting started page, so NotificationDialog works fine...

6

And you have the DialogService injected in the page you are trying to use it?

7

Sure!

Program.cs

builder.Services.AddServicesFromRCL();

In RCL => RCLServiceCollection.cs:

 public static class RCLServiceCollection
    {
        public static void AddServicesFromRCL(this IServiceCollection serviceCollection)
        {
            // Third Party Services
            // Radzen Services
            serviceCollection.AddScoped<DialogService>();
            serviceCollection.AddScoped<NotificationService>();
            serviceCollection.AddScoped<ContextMenuService>();

            // Project Services
           [...]
        }
    }

In RCL => MainLayout.razor

<RadzenLayout>
    
   [...]

</RadzenLayout>

@* Start Radzen Services*@
<RadzenDialog />
<RadzenNotification />
<RadzenContextMenu />

@code {
    bool sidebar1Expanded = true;
}

In RCL => DataGrid.razor:

@inject DialogService DialogService 

<RadzenButton ButtonStyle="ButtonStyle.Success"
              Icon="add_circle_outline" 
              class="mt-4 mb-4"
              Text="Neu"
              Click="@AddGegner" />

[...]

@code {

[...]

 public async Task AddGegner()
    {
        await DialogService.OpenAsync<Kontakte.KontaktAdd>("Neuer Kontakt", options: new DialogOptions() { Width = "700px", Height = "512px", Resizable = true, Draggable = true });
        
    }
}

NuGet packages Radzen and Radzen.Blazor are installed (in Server-App and in RCL) and updated to the latest version. NotificationService works, but DialogService not...

8

I think there would have been an exception if DialogService weren't injected - Blazor throws exception if it can't provide a value for a property which is injected. Something else is probably null. The debugger would reveal more.