public Task <string> TestCall(string arg)
{
return(Task.Run(async() =>
{
Console.WriteLine($"TestCall called from {_callContext.CallerInfo.Name}: {arg}");
var str = await _callContext.GetCallbackChannel <ITestCallbackService>().TestCallbackAsync("Hello!");
Console.WriteLine($"Callback from {_callContext.CallerInfo.Name} returned: {str}");
return $"TestCall received: {arg}";
}));
}