Readme sample needs to be actualized to current version blazor sample project.

[TPIvan]

The sample code in readme is probably created for some old sample project version. the correct current version is:

@inject Data.WeatherForecastService ForecastService
@page "/grid"

<h1>Weather forecast</h1>

<GridView DataAdapter="@dataAdapter" PageSize="5"></GridView>

@code{
    CollectionTableDataAdapter<Data.WeatherForecast> dataAdapter;

    protected override async Task OnInitializedAsync()

    {
        var forecast = await ForecastService.GetForecastAsync(DateTime.Now);
        dataAdapter = new CollectionTableDataAdapter<Data.WeatherForecast>(forecast);
    }

}

And the image