C# LIST和STRING互相轉換

List轉字串，用逗號隔開

List<string> list = new List<string>();
list.Add("a");
list.Add("b");
list.Add("c");
//MessageBox.Show(list.);
//LoadModel();
string s = string.Join(",", list.ToArray());
MessageBox.Show(s);

List<test> list = new List<test>();
list.Add(new test("1", "a"));
list.Add(new test("2", "b"));
list.Add(new test("", ""));
list.Add(new test("3", "c"));
var a = from o in list select o.test1;
var b = from o in list select o.test2;
string s1 = string.Join(",", a.ToArray());
string s2 = string.Join(",", b.ToArray());
MessageBox.Show(s1 + "\r\n" + s2);

結果：1,2,,3

a,b,,c

字串轉List

這裡s的分隔字元不是“,”而是“， ”，後面有一個空格

string s = "1, 2, 3";
List<string> list = new List<string>(s.Split(new string[] { ", " }, StringSplitOptions.RemoveEmptyEntries));
foreach (string t in list)
{
MessageBox.Show("*" + t + "*");
}

這裡s的分隔字元是“,”

string s = "1,2,3";
List<string> list = new List<string>(s.Split(','));
foreach (string t in list)
{
MessageBox.Show("*" + t + "*");
}