常用

1、字符创转换成日期格式

string str = "2012-12-12 12:00:00";
DateTime dt1 = Convert.ToDateTime(str);
DateTime dt2 = DateTime.Parse(str);
DateTime dt3 = DateTime.ParseExact(str, "yyyy-MM-dd HH:mm:ss", null);

 2.split（）

string s = "a,b,c,d,e";
string [] strs = s.Split(new string[]{","},StringSplitOptions.RemoveEmptyEntries);
int i = strs.Length;
Console.WriteLine(i);