RadzenListBox won't let me select items

Radzen Studio Blazor WebAssembly
1

Something here is breaking the RadzenListBox and I have no idea what; the checkboxes can't be checked but I get no errors to indicate anything is wrong. The list populates and looks correct other than the checkboxes not working.

        <!--This one works, I just put it in to try and figure out what was wrong -->
<RadzenListBox AllowFiltering="true" FilterCaseSensitivity="FilterCaseSensitivity.CaseInsensitive" @bind-Value=@selectedWorkQueues 
                       Multiple="true" Data=@deleteMe TextProperty="Name" ValueProperty="ModelKey" TValue="IEnumerable<Guid>"/>
        <!--actual desired code that doesn't work -->
        @foreach (Project project in ProjectList.Except(new[] {CurrentProject}).ToList())
        {
            var workQueueList = OtherProjectsWorkQueues[project.ModelKey];
            if (workQueueList.ActiveQueues.Any())
            {
                <MudText>@project.Name</MudText>
                <RadzenListBox AllowFiltering="true" FilterCaseSensitivity="FilterCaseSensitivity.CaseInsensitive" @bind-Value=@selectedWorkQueues 
                               Multiple="true" Data=@workQueueList.ActiveQueues TextProperty="Name" ValueProperty="ModelKey" TValue="IEnumerable<Guid>"/>
            }
        }

private IEnumerable<Guid> selectedWorkQueues = new List<Guid>();
private List<WorkQueue> deleteMe = new List<WorkQueue>{new WorkQueue{Name = "a", ModelKey = new Guid()}};

In case anyone was wondering, workQueueList.ActiveQueues returns a List<WorkQueue> so it's the same type as the deleteme var.

2

Hi @hamdawg87,

Try changing the type of selectedWorkQueues to IList<Guid>

1 Like
3

Thanks, now the checkboxes work and I have an actual error message to figure out what else is wrong.

Edit: I guess I celebrated too soon, the error message I got was not any easier to solve than the original problem.
What I changed the code to:

<RadzenListBox AllowFiltering="true" FilterCaseSensitivity="FilterCaseSensitivity.CaseInsensitive" @bind-Value=selectedWorkQueues
               Multiple="true" Data=@workQueueList.ActiveQueues TextProperty="Name" ValueProperty="ModelKey" TValue="IList<Guid>"/>

and the c#:

private IList<Guid> selectedWorkQueues;

Error message:

crit: Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100]
      Unhandled exception rendering component: Specified cast is not valid.
System.InvalidCastException: Specified cast is not valid.
   at Radzen.DropDownBase`1.<SelectItem>d__86[[System.Collections.Generic.IList`1[[System.Guid, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
   at Radzen.DropDownBase`1.<SelectItemInternal>d__85[[System.Collections.Generic.IList`1[[System.Guid, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
   at Radzen.Blazor.RadzenListBoxItem`1.<<BuildRenderTree>b__0_0>d[[System.Collections.Generic.IList`1[[System.Guid, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
   at Microsoft.AspNetCore.Components.ComponentBase.CallStateHasChangedOnAsyncCompletion(Task task)
   at Microsoft.AspNetCore.Components.RenderTree.Renderer.GetErrorHandledTask(Task taskToHandle)
4

I should also note that on a different page I got it working with IEnumerable<int>, so now I'm thinking maybe that only works for primitives and you have to use an actual list otherwise.

5

Bumping because this is still broken with no response in last 24 hours.

6

Hi @hamdawg87

If you have a Radzen professional subscription you can send us your project to info@radzen.com

7

We don't have a subscription and we're not going to get one. All I know is that it's something in the compiler generated method of yours that's doing an invalid cast. I can't see the code, so I can't possibly fix it. Guess I'll find a different library or write my own solution from scratch.

dropDownBase.Value = (object) dropDownBase.selectedItems.Select<object, object>(new Func<object, object>(dropDownBase.\u003CSelectAll\u003Eb__43_0)).AsQueryable<object>().Cast(property.PropertyType);