IAsyncOperation
     
      ^ asyncOperation = create_async( []() {    return create_task(FirstAsync(...))    .then( [](X val){        return SecondAsync(val, ...);    }).then( [](Y val)        return ThirdAsync(val, ...);    });
     

 

这段代码会执行FirstAsync->SecondAsync->ThirdAsync，最后返回的是 ThirdAsync的结果。

 

http://www.cnblogs.com/zjjcy/archive/2012/05/13/2489298.html