（1 ）Convert.ToDateTime(string)

string格式有要求，必须是yyyy-MM-dd hh:mm:ss

 

（2）：Convert.ToDateTime(string, IFormatProvider)

DateTime dt;DateTimeFormatInfo dtFormat = new System.GlobalizationDateTimeFormatInfo();dtFormat.ShortDatePattern = "yyyy/MM/dd";dt = Convert.ToDateTime("2012/11/26", dtFormat);

 

（3）：DateTime.ParseExact()

string dateString = "20121126";DateTime dt = DateTime.ParseExact(dateString, "yyyyMMdd", System.Globalization.CultureInfo.CurrentCulture);//或者DateTime dt = DateTime.ParseExact(dateString, "yyyyMMdd", System.Globalization.CultureInfo.InvariantCulture);

 

C# string格式的日期时间字符串转为DateTime类型