public static IServiceCollection AddXafDashboards(
    this IServiceCollection services,
    Action<BlazorDashboardConfigurator, IServiceProvider> configure = null
)

<ExtensionAttribute>
Public Shared Function AddXafDashboards(
    services As IServiceCollection,
    configure As Action(Of BlazorDashboardConfigurator, IServiceProvider) = Nothing
) As IServiceCollection

using DevExpress.ExpressApp.Dashboards.Blazor;
// ...
public class Startup {
    // ...
    public void ConfigureServices(IServiceCollection services){
        //...
        services.AddXafDashboards((dashboardConfigurator, services) => {
            var configuration = services.GetRequiredService<IConfiguration>();
            dashboardConfigurator.SetConnectionStringsProvider(new DashboardConnectionStringsProvider(configuration));
        });
        // ...
    }
    // ...
}