Foreach循环给出错误的结果

List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
foreach (int number in numbers)
{
    Console.WriteLine(number);
}

List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
List<int> filteredNumbers = new List<int>();

foreach (int number in numbers)
{
    if (number % 2 == 0)
    {
        filteredNumbers.Add(number);
    }
}

List<int> numbers = new List<int>(); // 可能为空
if (numbers != null && numbers.Count > 0)
{
    foreach (int number in numbers)
    {
        Console.WriteLine(number);
    }
}
else
{
    Console.WriteLine("集合为空");
}

List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };
object lockObject = new object();

Parallel.ForEach(numbers, number =>
{
    lock (lockObject)
    {
        Console.WriteLine(number);
    }
});