await和async在C#一般处理程序(ashx)中的使用

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public class hello : HttpTaskAsyncHandler, IReadOnlySessionState    {                  public IFetchServise fetch { get; set; }            public override async Task ProcessRequestAsync(HttpContext context)        {            context.Response.ContentType = "text/plain";              var name = await fetch.RandomFortuneAsync();            context.Response.Write(name);        }                     }