public async void GetObjWithId()
{
AVObject character = AVObject.CreateWithoutData("Sport", "5b4464a49f5454003b178628");
await character.FetchAsync().ContinueWith(t =>
{
if (character.IsKeyDirty("totalTime"))
{
character.FetchAsync();
}
Console.WriteLine("name:" + character.Get <string>("name"));
Console.WriteLine("totalTime:" + character.Get <double>("totalTime")); //此处用int取小数的话，不会报错，会自动被转化为int
Console.WriteLine("grade:" + character.Get <string>("grade"));
//if(character.is)
// Console.WriteLine("noExist:" + character.Get<string>("noExist")); //报异常
});
}