List<> ，string[]和string的相互转换

1、string转换成string[]数组

 string str = "aaa,bbb,ccc,dddd";
 string[] strs = str.Split(',');

2、string[]数组转换成List<string>

string[] str={"str","string","abc"};
List<string> list=new List<string>(str);

3、List<string>转换成string[]数组

List<string> list=new List<string>();
list.Add("hello");
list.Add("world");
string[] str=list.ToArray();

4、List<string>转换成string

List<string> list=new List<string>(); 
string strp = string.Join(",", list.ToArray());

5、List<int>转换成List<string>

List<int> list1 = new List<int>(new int[] { 1,2,3 } );
List<string> list2 = l1.ConvertAll<string>(x => x.ToString());

6、List<string>转换成List<int>

var list1 =(new[]{"1","2","3"}).ToList();
var list2 = list1 .Select<string,int>(x =>Convert.ToInt32(x));