DateTime dt = DateTime.Now; //当前时间
string Year = dt.Year.ToString(); //当前年份
string lastYear = dt.AddYears(-1).Year.ToString();//上年年份
string CreateTime = DateTime.Now.ToString();//创建时间
DateTime dt = DateTime.Now; //当前时间
string Year = dt.Year.ToString(); //当前年份
string lastYear = dt.AddYears(-1).Year.ToString();//上年年份
string CreateTime = DateTime.Now.ToString();//创建时间