我使用System.DateTime.Now
,但它像2011年5月28日凌晨1:45:58返回
。(无毫秒精度)
我想在数据库中以毫秒精度保存当前时间(或日期时间)。
更新:对不起,我的意思是Milli秒
我使用System.DateTime.Now
,但它像2011年5月28日凌晨1:45:58返回
。(无毫秒精度)
我想在数据库中以毫秒精度保存当前时间(或日期时间)。
更新:对不起,我的意思是Milli秒
System.DateTime
将精度管理到毫秒,2011年5月28日1:45:58 AM
正是它被格式化为字符串的方式。
要使用包含毫秒的格式,请使用格式字符串:“d/M/yyyy hh:mm:ss.fff tt”
如果要将其存储在SQL Server数据库中,ADO.Net会自动将CLR<code>System.DateTime</code>数据类型转换为SQL Server<code>DateTime</code〕数据类型(反之亦然)。
CLR<code>System.DateTime</code>具有100纳秒的精度(例如,每个刻度为100纳秒;每毫秒10000个刻度,每秒1000万个刻度。
SQL Server日期时间数据类型精确到(大约)3ms。
你不必担心:ADO.Net会帮你处理的。
哦,如果你真的想浪费额外的纳秒,这样的东西应该能起到作用:
public static DateTime ToExactMillisecondPrecision( DateTime dt )
{
const long TICKS_PER_MILLISECOND = 10000 ;
long totalMilliseconds = dt.Ticks / TICKS_PER_MILLISECOND ;
return new DateTime( totalMilliseconds * TICKS_PER_MILLISECOND ) ;
}
我自己真的看不出有什么需要。
应该没有必要将日期转换为字符串。也许真正的问题是使用动态SQL。
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