TaskScheduler.UnobservedTaskException
2014-04-30 11:30
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TaskScheduler.UnobservedTaskException += (_, ev) => PrintException(ev.Exception);
C#的async/await功能基于TPL的Task对象,每个await操作符都是“等待”一个Task完成。在之前(或者说如今)的TPL中,Task对象的析构函数会查看它的Exception对象有没有被“访问”过,如果没有,且Task对象出现了异常,则会抛出这个异常,最终导致的结果往往便是进程退出。因此,我们必须小心翼翼地处理每一个Task对象的错误,不得遗漏。在.NET 4.5中这个行为被改变了,对于任何没有被检查过的异常,便会触发TaskSchedular.UnobservedTaskException事件——如果您不监听这个事件,未捕获的异常也就这么无影无踪了。
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