C# 线程静态 + 易失性成员未按预期工作

我正在阅读提示和技巧帖子，我想我会尝试一些我以前从未做过的 C# 东西。因此，下面的代码没有实际用途，而只是一个"测试函数"，看看会发生什么。

无论如何，我有两个静态私有字段：

private static volatile string staticVolatileTestString = "";
[ThreadStatic]
private static int threadInt = 0;

如您所见，我正在测试ThreadStaticAttribute和volatile 关键字。

无论如何，我有一个如下所示的测试方法：

private static string TestThreadStatic() {
    // Firstly I'm creating 10 threads (DEFAULT_TEST_SIZE is 10) and starting them all with an anonymous method
    List<Thread> startedThreads = new List<Thread>();
    for (int i = 0; i < DEFAULT_TEST_SIZE; ++i) {
        Thread t = new Thread(delegate(object o) {
            // The anon method sets a newValue for threadInt and prints the new value to the volatile test string, then waits between 1 and 10 seconds, then prints the value for threadInt to the volatile test string again to confirm that no other thread has changed it
            int newVal = randomNumberGenerator.Next(10, 100);
            staticVolatileTestString += Environment.NewLine + "'tthread " + ((int) o) + " setting threadInt to " + newVal;
            threadInt = newVal;
            Thread.Sleep(randomNumberGenerator.Next(1000, 10000));
            staticVolatileTestString += Environment.NewLine + "'tthread " + ((int) o) + " finished: " + threadInt;
        });
        t.Start(i);
        startedThreads.Add(t);
    }
    foreach (Thread th in startedThreads) th.Join();
    return staticVolatileTestString;
}

我希望看到从这个函数返回的是这样的输出：

thread 0 setting threadInt to 88
thread 1 setting threadInt to 97
thread 2 setting threadInt to 11
thread 3 setting threadInt to 84
thread 4 setting threadInt to 67
thread 5 setting threadInt to 46
thread 6 setting threadInt to 94
thread 7 setting threadInt to 60
thread 8 setting threadInt to 11
thread 9 setting threadInt to 81
thread 5 finished: 46
thread 2 finished: 11
thread 4 finished: 67
thread 3 finished: 84
thread 9 finished: 81
thread 6 finished: 94
thread 7 finished: 60
thread 1 finished: 97
thread 8 finished: 11
thread 0 finished: 88

但是，我得到的是：

thread 0 setting threadInt to 88
thread 4 setting threadInt to 67
thread 6 setting threadInt to 94
thread 7 setting threadInt to 60
thread 8 setting threadInt to 11
thread 9 setting threadInt to 81
thread 5 finished: 46
thread 2 finished: 11
thread 4 finished: 67
thread 3 finished: 84
thread 9 finished: 81
thread 6 finished: 94
thread 7 finished: 60
thread 1 finished: 97
thread 8 finished: 11
thread 0 finished: 88

输出的后"一半"符合预期（我想这意味着 ThreadStatic 字段的工作方式与我想象的一样），但似乎一些初始输出已从前"一半"中"跳过"。

此外，前"一半"中的线程是无序的，但我知道线程不会在调用 Start（） 后立即运行;相反，内部操作系统控件将按照它认为合适的方式启动线程。编辑：不，他们不是，实际上，我只是认为他们是因为我的大脑错过了连续的数字

所以，我的问题是：是什么问题导致我在输出的前"一半"中丢失了几行？例如，"线程 3 将 threadInt 设置为 84"行在哪里？