我遇到了一些奇怪的行为... 当我在ThreadTest
方法中迭代dummyText
List
时,我会得到一个索引超出范围异常(ArgumentOutOfRangeException
),但是如果我删除线程,只打印文本,那么一切都正常。
这是我的主要方法:
public static Object sync = new Object();
static void Main(string[] args)
{
ThreadTest();
Console.WriteLine("Press any key to continue.");
Console.ReadKey();
}
此方法抛出异常:
private static void ThreadTest()
{
Console.WriteLine("Running ThreadTest");
Console.WriteLine("Running ThreadTest");
List<String> dummyText = new List<string>()
{ "One", "Two", "Three", "Four", "Five",
"Six", "Seven", "Eight", "Nine", "Ten"};
for (int i = 0; i < dummyText.Count; i++)
{
Thread t = new Thread(() => PrintThreadName(dummyText[i])); // <-- Index out of range?!?
t.Name = ("Thread " + (i));
t.IsBackground = true;
t.Start();
}
}
private static void PrintThreadName(String text)
{
Random rand = new Random(DateTime.Now.Millisecond);
while (true)
{
lock (sync)
{
Console.WriteLine(Thread.CurrentThread.Name + " running " + text);
Thread.Sleep(1000+rand.Next(0,2000));
}
}
}
这不会抛出异常:
private static void ThreadTest()
{
Console.WriteLine("Running ThreadTest");
List<String> dummyText = new List<string>()
{ "One", "Two", "Three", "Four", "Five",
"Six", "Seven", "Eight", "Nine", "Ten"};
for (int i = 0; i < dummyText.Count; i++)
{
Console.WriteLine(dummyText[i]); // <-- No exception here
}
}
有谁知道这是为什么吗?