If seems that if databind to an ObservableCollection returned from a (synchronous) property, the DropDownList is updating as the ObservableCollection changes.

If I databind to an ObserverableCollection returned from an asynchronous method, I have to run StateHasChanged() to force the DropDownList to refresh its datasource.  

Here are some snippets to demonstrate:

public class ApiDataSourceModel{

public int MyValueField { get; set; }

public string MyTextField { get; set; }

}

public class DropDownModel
        public string Value { get; set; }
        public string Text { get; set; }
    }

        public async Task<ObservableCollection<DropDownModel>> GetApiDataSource()
        {

//Tried returnApiDataSource as List and even here as ObservableCollection to try to get to refresh DropDownList
                ObservableCollection<ApiDataSourceModel> returnApiDataSource = await GetMyApiDataSource();
                if (returnApiDataSource is not null)
                {
                    return returnApiDataSource.Select(c => new DropDownModel() { Value = MyValueField.ToString(), Text = MyTextField  }).ToList().ConvertIEnumerableToObservableCollection();
                }
                else
                    return default(ObservableCollection<Models.System.DropDownModel>);
        }

//Custom Extension
        public static ObservableCollection<T> ConvertIEnumerableToObservableCollection<T>(this IEnumerable<T> iEnumerableCollection)
        {
            if (iEnumerableCollection is not null)
                return new ObservableCollection<T>(iEnumerableCollection);
            else
                return null;
        }

string selectedApiDataSourceValue;

   protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender)
        {

ObservableCollection<DropDownModel> sourceForDdl = await GetApiDataSource();

//This won't update DDL without StateHasChanged() even though DDL data is an Observable collection that has been updated.

StateHasChanged();

}

}

DropDownList

  <TelerikDropDownList @bind-Value="@selectedApiDataSourceValue"
                                                     Id="ApiDataSourceField"
                                                     Data="@sourceForDdl ">
                                </TelerikDropDownList>

Hi,

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Best regards,

Peter

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Thanks!

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Best Regards, Stefan

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