RadzenDropDown System.NullReferenceException

Radzen Studio Blazor Server
1

Hi, some kind of strange mistake, what I do not know?

        private string[] countries2 = new string[] { "один","два","три" };

        <RadzenDropDown TValue="string"
                        Data="@countries2"
                        Style="width: 100%;">

        </RadzenDropDown>

Error:
blazor.server.js:15 [2020-02-13T10:02:27.725Z] Error: System.NullReferenceException: Object reference not set to an instance of an object.
at System.Object.GetType()
at Microsoft.AspNetCore.Components.Forms.EditContextDataAnnotationsExtensions.TryGetValidatableProperty(FieldIdentifier& fieldIdentifier, PropertyInfo& propertyInfo)
at Microsoft.AspNetCore.Components.Forms.EditContextDataAnnotationsExtensions.ValidateField(EditContext editContext, ValidationMessageStore messages, FieldIdentifier& fieldIdentifier)
at Microsoft.AspNetCore.Components.Forms.EditContextDataAnnotationsExtensions.<>c__DisplayClass1_0.b__1(Object sender, FieldChangedEventArgs eventArgs)
at Microsoft.AspNetCore.Components.Forms.EditContext.NotifyFieldChanged(FieldIdentifier& fieldIdentifier)
at Radzen.DropDownBase1.SelectItem(Object item, Boolean raiseChange) at Radzen.Blazor.RadzenDropDown1.<>c__DisplayClass0_0.b__8()
at Microsoft.AspNetCore.Components.EventCallbackWorkItem.InvokeAsync[T](MulticastDelegate delegate, T arg)
at Microsoft.AspNetCore.Components.ComponentBase.Microsoft.AspNetCore.Components.IHandleEvent.HandleEventAsync(EventCallbackWorkItem callback, Object arg)
at Microsoft.AspNetCore.Components.RenderTree.Renderer.DispatchEventAsync(UInt64 eventHandlerId, EventFieldInfo fieldInfo, EventArgs eventArgs)

2

the error will be in that case

<EditForm Model="@createModel">
    <DataAnnotationsValidator />
    <RadzenDropDown TValue="string"
                    Data="@countries2"
                    Style="width: 100%;" />
</EditForm>

DataAnnotationsValidator causes an error

3

You would need @bind-Value for this case. Similar to <InputText> the RadzenDropDown needs it when put inside <EditForm>. We will see if we can throw a more meaningful error in this case.