如果我在一个lock语句中有一个yield,这个锁是在每个yield (在下面的例子中是5次)被取出,还是只对列表中的所有项都被取出一次?
谢谢
private List<string> _data = new List<string>(){"1","2","3","4","5"};
private object _locker =new object();
public IEnumerable<string> GetData()
{
lock (_locker)
{
foreach (string s in _data)
{
yield return s;
}
}
}
发布于 2015-03-14 06:49:04
@Lockszmith有一个很好的捕获(+1)。我之所以发布这篇文章,是因为我发现他的代码很难读懂。这是一个“社区维基”。请随时更新。
object lockObj = new object();
Task.Factory.StartNew((_) =>
{
System.Diagnostics.Debug.WriteLine("Task1 started");
var l1 = GetData(lockObj, new[] { 1, 2, 3, 4, 5, 6, 7, 8 }).ToList();
}, TaskContinuationOptions.LongRunning);
Task.Factory.StartNew((_) =>
{
System.Diagnostics.Debug.WriteLine("Task2 started");
var l2 = GetData(lockObj, new[] { 10, 20, 30, 40, 50, 60, 70, 80 }).ToList();
}, TaskContinuationOptions.LongRunning);
public IEnumerable<T> GetData<T>(object lockObj, IEnumerable<T> list)
{
lock (lockObj)
{
foreach (T x in list)
{
System.Diagnostics.Debug.WriteLine("Thread " + Thread.CurrentThread.ManagedThreadId + " returned " + x );
Thread.Sleep(1000);
yield return x;
}
}
}
https://stackoverflow.com/questions/2847586
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