假设我得到以下代码:
var tasks = BuildTaskList();
try
{
Task.WaitAll(tasks.ToArray());
}
catch (AggregateException exception)
{
}
我怎么知道哪个任务抛出了哪个异常exception.InnerExceptions
?
假设我得到以下代码:
var tasks = BuildTaskList();
try
{
Task.WaitAll(tasks.ToArray());
}
catch (AggregateException exception)
{
}
我怎么知道哪个任务抛出了哪个异常exception.InnerExceptions
?
您仍然有 的列表Tasks
,并且每个Task
都有一个Exception
属性。使用它,您可以找出哪些异常属于哪个Task
.
但是,如果可以的话,最好使用Task.WhenAll
或TaskFactory.ContinueWhenAll
执行阻塞等待。
var throwers = tasks.Where(task => task.Exception != null);
var t1 = Task.Factory.StartNew(() => Console.WriteLine("Task 1"));
var t2 = Task.Factory.StartNew(() => Console.WriteLine("Task 2"));
var t3 = Task.Factory.StartNew(() => { throw new InvalidOperationException(); });
var t4 = Task.Factory.StartNew(() => Console.WriteLine("Task 4"));
Task.Factory.ContinueWhenAll(new[] { t1, t2, t3, t4 }, tasks =>
{
foreach (var t in tasks)
{
if (t.Status == TaskStatus.Faulted)
{
// this will run for t3
Console.WriteLine("This task has been faulted.");
}
}
});
选项1(归功于@theodor-zoulias 评论):
您可以Exception.Data
使用任务名称设置属性:
var task1 = Task.Factory.StartNew(() =>
{
try
{
throw new Exception();
}
catch (Exception exception)
{
exception.Data["task"] = "task1";
throw exception;
}
});
var task2 = Task.Factory.StartNew(() =>
{
try
{
throw new Exception();
}
catch (Exception exception)
{
exception.Data["task"] = "task2";
throw exception;
}
});
try
{
Task.WaitAll(task1, task2);
}
catch (AggregateException ae)
{
foreach (var exception in ae.InnerExceptions)
{
Console.WriteLine($"Exception was thrown by {exception.Data["task"]}");
}
}
选项2:
如果您不介意丢失异常的程序集信息的名称,您可以根据任务名称设置抛出的异常的Exception.Source
( doc ) 属性,并在迭代时查看它:
var t1 = Task.Factory.StartNew(() =>
{
throw new Exception() { Source = "t1" };
});
var t2 = Task.Factory.StartNew(() =>
{
throw new Exception() { Source = "t2" };
});
try
{
Task.WaitAll(t1, t2);
}
catch (AggregateException ae)
{
foreach (var exception in ae.InnerExceptions)
{
Console.WriteLine($"Exception was thrown by {exception.Source}");
}
}
将输出:
t1 抛出异常
t2 抛出异常