public string GetVo4()
{
var expando = new ExpandoModel();
expando.AddPropertyFilter(ExpandoPropertyFilterFactory.CreateExcludeFilter("bad"));
expando.Set("A", () => Task.FromResult("abc"));
expando.Set("B", async() => await Task.FromResult("abc"));
expando.Set("bad", () => Task.FromResult("bad"));
return(JsonConvert.SerializeObject(expando, Formatting.Indented));
}
