格式化字符串--转同事经验

最近看到了如下的代码，目的是为了格式化日期和数字：

DateTime tmpTime = clientTime.Subtract(timeLiness);               string hour = (tmpTime.Hour.ToString().Length == 1 ?"0" + tmpTime.Hour : tmpTime.Hour.ToString());               string minute = (tmpTime.Minute.ToString().Length == 1                                     ?"0" + tmpTime.Minute                                     : tmpTime.Minute.ToString());               string second = (tmpTime.Second.ToString().Length == 1                                     ?"0" + tmpTime.Second                                     : tmpTime.Second.ToString());               string millSecond = DateTime.Now.ToFileTime().ToString();               if (millSecond.Length == 1)                    millSecond +="00";               if (millSecond.Length == 2)                    millSecond +="0";               string fileName = string.Format("{0}_BatchInventory_{1}{2}{3}_{4}_{5}_{6}_{7}.{8}",                                               CPApplication.Current.SellerID, tmpTime.Year,                                                tmpTime.Month, tmpTime.Day, hour, minute, second, millSecond, fileType);

 感觉可能有同学对格式化字符串还不熟悉。这样写很累的。

 就这个案例而言，最简单的写法如下：

               DateTime tmpTime = clientTime.Subtract(timeLiness);               string fileName = string.Format("{0}_BatchInventory_{1:yyyyMMdd_HH_mm_ss_fff}.{2}",                                               CPApplication.Current.SellerID, tmpTime, fileType); 

 这个案例中，格式化数字的写法如下：              

 

DateTime tmpTime = clientTime.Subtract(timeLiness); string hour = tmpTime.Hour.ToString("00");          string millSecond = DateTime.Now.ToFileTime().ToString("000");

 

参考资料：

完整的格式化字符串的资料如下：

http://msdn.microsoft.com/zh-cn/library/26etazsy%28v=vs.80%29.aspx