ArrayList与string 和string【】之间的转换
//Arraylist转换为string【】
ArrayList list = new ArrayList();
list.Add("aaa");
list.Add("bbb");
list.Add("ccc");
string[] arr = (string[])list.ToArray(typeof(string));
for (int i = 0; i < arr.Length; i++)
{
Console.WriteLine(arr[i]);
}

//string【】转换为arrayList
ArrayList list1 = new ArrayList(new string[] { "asdf", "safsa", "3242" });
foreach (string s in list1)

Console.WriteLine(s);
//ArrayList转换为string
ArrayList lsit = new ArrayList();
lsit.Add("sadfasdfs");
lsit.Add("asdfsdfsdf");
string str = string.Join(",", (string[])lsit.ToArray(typeof(string)));
Console.WriteLine(str);
//string 转换为ArrayList
string sr = "1,2,3,4,5";
ArrayList b = new ArrayList(sr.Split(','));
foreach (string a in b)
Console.WriteLine(a);