c# - Task finishes before expected -


i have method: private static async task mymethod(); , invocated way:

public static void main() { s_finishing = false; task printtask = printstatistics(); mymethod(serverssawa, serverssterling).wait(); s_finishing = true; }

i expect printstatistics stop run after mymethod completed. unfortunately doesn`t. if comment line s_finishing = true; task runs forever - , allows mymethod completed how can solve issue?

private static async task printstatistics()             {                 while (!s_finishing)                 {                     long total = 0;                     await task.delay(timespan.fromseconds(20));                     foreach (var statistic in s_statistics)                     {                         toolstracer.trace("{0}:{1}", statistic.key, statistic.value);                         total += statistic.value;                     }                      foreach (var statistic in s_statisticsregion)                     {                         toolstracer.trace("{0}:{1}", statistic.key, statistic.value);                     }                      toolstracer.trace("total:{0}", total);                     toolstracer.trace("time:{0}", s_stopwatch.elapsed);                 }             } private static async task mymethod() { parallel.foreach(                         data,                         new paralleloptions { maxdegreeofparallelism = 20 }, async serverandcluster =>                         {                             await somemethod()                        }); }

i believe problem here:

parallel.foreach(..., async ...);

you can't use async foreach. it's extremely rare need both parallel (cpu-bound) , async (i/o-bound) in same method. if want concurrency (which suspect), use task.whenall instead of foreach. if need both cpu parallelism , async, use tpl dataflow.


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