{
private static readonly string YEAR_FORMAT = "yyyy";
private static readonly string MONTH_FORMAT = "yyyyMM";
private static readonly string DAY_FORMAT = "yyyyMMdd";
private static readonly string HOUR_FORMAT = "yyyyMMddHH";
private static readonly string MINUTE_FORMAT = "yyyyMMddHHmm";
private static readonly string SECOND_FORMAT = "yyyyMMddHHmmss";
private static readonly string MILLISECOND_FORMAT = "yyyyMMddHHmmssfff";
public static readonly DateTime BASE_UNIVERSAL_TIME = DateTime.Parse("January 1, 1970, 00:00:00 GMT").ToUniversalTime();
public static string TimeToString(long l, Resolution resolution)
{
DateTime dt = LongToDateTime(l);
string result = string .Empty ;
switch (resolution)
{
case Resolution.YEAR:
result = dt.ToString(YEAR_FORMAT);
break;
case Resolution.MONTH:
result = dt.ToString(MONTH_FORMAT);
break;
case Resolution.DAY:
result = dt.ToString(DAY_FORMAT);
break;
case Resolution.HOUR:
result = dt.ToString(HOUR_FORMAT);
break;
case Resolution.MINUTE:
result = dt.ToString(MINUTE_FORMAT);
break;
case Resolution.SECOND:
result = dt.ToString(SECOND_FORMAT);
break;
case Resolution.MILLISECOND:
result = dt.ToString(MILLISECOND_FORMAT);
break;
}
return result;
}
public static string TimeToString(DateTime time, Resolution resolution)
{
return TimeToString(DateTimeToLong(time), resolution);
}
public static long Round(long time, Resolution resolution)
{
DateTime dt = BASE_UNIVERSAL_TIME.AddMilliseconds(time).ToUniversalTime();
switch (resolution)
{
case Resolution.YEAR:
dt = dt.AddMonths(1 - dt.Month).AddDays(1 - dt.Day).AddHours(0 - dt.Hour).AddMinutes(0 - dt.Minute).AddSeconds(0 - dt.Second).AddMilliseconds(0 - dt.Millisecond);
break;
case Resolution.MONTH:
dt = dt.AddDays(1 - dt.Day).AddHours(0 - dt.Hour).AddMinutes(0 - dt.Minute).AddSeconds(0 - dt.Second).AddMilliseconds(0 - dt.Millisecond);
break;
case Resolution.DAY:
dt = dt.AddHours(0 - dt.Hour).AddMinutes(0 - dt.Minute).AddSeconds(0 - dt.Second).AddMilliseconds(0 - dt.Millisecond);
break;
case Resolution.HOUR:
dt = dt.AddMinutes(0 - dt.Minute).AddSeconds(0 - dt.Second).AddMilliseconds(0 - dt.Millisecond);
break;
case Resolution.MINUTE:
dt = dt.AddSeconds(0 - dt.Second) .AddMilliseconds(0 - dt.Millisecond);
break;
case Resolution.SECOND:
dt = dt.AddMilliseconds(0 - dt.Millisecond);
break;
case Resolution.MILLISECOND:
break;
}
return DateTimeToLong(dt);
}
public static DateTime Round(DateTime date, Resolution resolution)
{
return LongToDateTime(Round(DateTimeToLong(date), resolution));
}
public static long DateTimeToLong(DateTime time)
{
return (long)(time.ToUniversalTime() - BASE_UNIVERSAL_TIME).TotalMilliseconds;
}
public static DateTime LongToDateTime(long l)
{
return BASE_UNIVERSAL_TIME.AddMilliseconds(l).ToUniversalTime();
}
public enum Resolution
{
YEAR,
MONTH,
DAY,
HOUR,
MINUTE,
SECOND,
MILLISECOND
}
}
//实现Java的Long.parseLong(String sQint radix)
public static Int64 ConvertToInt64(string s, int fromBase)
{
Int64 result = 0;
for (int i = (s.Length-1),j=0; i >=0; i--,j++)
{
char ch = char.ToLower(s[i]);
int v = char.IsDigit(ch)==true?int.Parse(ch.ToString()):(10+(int)(ch-'a'));
result = result + Convert.ToInt64(v * Math.Pow(fromBase, j));
}
return result;
}
//实现Java的Long.toString(long iQint radix)
public static string ConvertToString(long l, int fromBase)
{
int maxP =(int) Math.Floor(Math.Log(l,fromBase));
int maxN = (int)Math.Floor(l / Math.Pow(fromBase, maxP));
char[] chs = new char[maxP+1];
chs[0] = (maxN >= 0 && maxN <= 9) ? char.Parse(maxN.ToString()) : (char)((int)('a')+(maxN - 10));
long n1 = (long)(l - maxN*Math.Pow(fromBase, maxP));
long temp=n1;
for (int i = (maxP-1),j=1; i >= 0;i--,j++)
{
int n2 = (int)Math.Floor(temp/Math.Pow(fromBase,i));
chs[j]=(n2>=0 && n2<=9)?char.Parse(n2.ToString()):(char)((int)('a')+(n2-10));
temp=(long)(temp-n2*Math.Pow(fromBase,i));
}
return new string(chs);
}
q样替换Lucene.Net中的相关代码Q就可以了。而且l过试Q发?Net版本的查询速度比Java版本的快很多Q很搞不清楚?/p>