C#程序遍历数组A中所有元素

string[] A = new string[] { "a1","a2","a3","a4","a5"}; 

//第一种方法 

for (int i = ; i < A.Length; i++)
{
Console.WriteLine(A[i]);
} 

//第二种方法
IEnumerator e= A.GetEnumerator();
while (e.MoveNext())
{
Console.WriteLine(e.Current.ToString());
} 

//第三种方法
foreach (string s in A)
{
Console.WriteLine(s);
}