c# - 如何在foreach之后使用迭代变量

Question

foreach (var (counter, _, _) in Count())
{
    ... // do stuff with counter
}
return counter;

counter之后超出范围，foreach因此上述方法不起作用。

如何在循环之后使用迭代变量之一

int latestCounter;
foreach (var (counter, _, _) in Count())
{
    ... // do stuff with counter
    latestCounter = counter;
}
return latestCounter;

标签： c#foreachscopevaluetupledeconstructor

Answer 1

Call MoveNext() until last

    List<int> Count = new List<int>();
    IEnumerator<int> e = Count.GetEnumerator();
    if (e.MoveNext())
    {
        while (true)
        {
            var current = e.Current;
            bool anyNext = e.MoveNext();
            if (!anyNext)
            {
                // here in last
                break;
            }
        }
    }