在.NET 4.0中,当主线程上的SynchronizationContext.Current
意外为空时,有什么解决方法?请参见:
在.NET 4.0中,当主线程上的SynchronizationContext.Current
意外为空时,有什么解决方法?请参见:
我创建了几个扩展方法,与ContinueWith
和StartNew
匹配,除了它们还接受一个额外的SyncronizationContext
参数。然后,我使用此参数在执行操作之前恢复了预期的SynchronizationContext
:
以下是示例:
public static class TaskExtensionMethods
{
public static Task ContinueWith_UsingSyncContextWorkaround(this Task task, Action<Task> continuationAction, CancellationToken cancellationToken, TaskContinuationOptions continuationOptions, TaskScheduler scheduler, SynchronizationContext sc)
{
Action<Task> actionWithWorkaround = t =>
{
SynchronizationContext.SetSynchronizationContext(sc);
continuationAction(t);
};
return task.ContinueWith(actionWithWorkaround, cancellationToken, continuationOptions, scheduler);
}
public static Task StartNew_UsingSyncContextWorkaround(this TaskFactory taskFactory, Action action, CancellationToken cancellationToken, TaskCreationOptions creationOptions, TaskScheduler scheduler, SynchronizationContext sc)
{
Action actionWithWorkaround = () =>
{
SynchronizationContext.SetSynchronizationContext(sc);
action();
};
return taskFactory.StartNew(actionWithWorkaround, cancellationToken, creationOptions, scheduler);
}
}
我随后使用这些扩展方法代替.ContinueWith
或.StartNew
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