12 在Foreach循环中如何获得当前迭代的索引

static void ForEachIndex()
{
int curIndex = 0;

Dictionary<string, string> diction = new Dictionary<string,string>();
int counter = 0;

diction.Add("One", "One");
diction.Add("Two", "Two");
diction.Add("Three", "Three");
diction.Add("Four", "Four");
diction.Add("Five", "Five");
diction.Add("Six", "Six");
diction.Add("Seven", "Seven");

foreach (Object obj in diction)
{
Console.WriteLine(counter);
counter++;
}

List<String> stringList = new List<string>();
stringList.Add("One");
stringList.Add("Two");
stringList.Add("Three");
stringList.Add("Four");
stringList.Add("Five");
stringList.Add("Six");
stringList.Add("Seven");

foreach(String str in stringList)
{
curIndex = stringList.IndexOf(str);
Console.WriteLine(curIndex.ToString());
}

System.Collections.ArrayList arList = new ArrayList();

arList.Add("One");
arList.Add("Two");
arList.Add("Three");
arList.Add("Four");
arList.Add("Five");
arList.Add("Six");
arList.Add("Seven");

foreach (String str in arList)
{
curIndex = arList.IndexOf(str);
Console.WriteLine(curIndex.ToString());
}
}