有没有一种方法可以在没有日期的情况下代表.NET中的时间值?例如,表明商店的营业时间?
TimeSpan
表示范围,而我只想存储时间值。使用DateTime
表示这会导致新的DateTime(1,1,1,8,30,0)
,这不是真正需要的。
答案 0 :(得分:145)
您可以使用timespan
TimeSpan timeSpan = new TimeSpan(2, 14, 18);
Console.WriteLine(timeSpan.ToString()); // Displays "02:14:18".
[编辑]
考虑到其他答案和问题的编辑,我仍然会使用TimeSpan。没有必要创建一个新结构,其中框架中的现有结构就足够了
在这些行上,您最终会复制许多本机数据类型。
答案 1 :(得分:128)
正如其他人所说,你可以使用DateTime
并忽略日期,或使用TimeSpan
。就个人而言,我并不热衷于这两种解决方案,因为这两种解决方案都没有真正反映出你想要代表的概念 - 我认为.NET中的日期/时间类型在某种程度上是在稀疏方面,这是我开始的原因之一Noda Time。在Noda Time中,您可以使用LocalTime
类型来表示一天中的某个时段。
要考虑的一件事:一天中的时间不一定是同一天午夜以来的时间长度......
(另外,如果您还想表示商店的结束时间,您可能会发现您想要代表24:00,即结束时间大多数日期/时间API - 包括Noda Time - 不允许将其表示为时间值。)
答案 2 :(得分:28)
如果那个空的Date
确实让你感到烦恼,你也可以创建一个更简单的Time
结构:
// more work is required to make this even close to production ready
class Time
{
// TODO: don't forget to add validation
public int Hours { get; set; }
public int Minutes { get; set; }
public int Seconds { get; set; }
public override string ToString()
{
return String.Format(
"{0:00}:{1:00}:{2:00}",
this.Hours, this.Minutes, this.Seconds);
}
}
或者,为什么要打扰:如果您不需要使用该信息进行任何计算,只需将其存储为String
即可。
答案 3 :(得分:18)
我说使用DateTime。如果您不需要日期部分,请忽略它。如果您只需要向用户显示时间,请将其格式化输出给用户,如下所示:
DateTime.Now.ToString("t"); // outputs 10:00 PM
似乎所有制作新课程甚至使用TimeSpan的额外工作都是不必要的。
答案 4 :(得分:7)
我认为鲁本斯' class是一个好主意,所以想用基本验证来创建他的Time类的不可变样本。
class Time
{
public int Hours { get; private set; }
public int Minutes { get; private set; }
public int Seconds { get; private set; }
public Time(uint h, uint m, uint s)
{
if(h > 23 || m > 59 || s > 59)
{
throw new ArgumentException("Invalid time specified");
}
Hours = (int)h; Minutes = (int)m; Seconds = (int)s;
}
public Time(DateTime dt)
{
Hours = dt.Hour;
Minutes = dt.Minute;
Seconds = dt.Second;
}
public override string ToString()
{
return String.Format(
"{0:00}:{1:00}:{2:00}",
this.Hours, this.Minutes, this.Seconds);
}
}
答案 5 :(得分:5)
除了 Chibueze Opata :
class Time
{
public int Hours { get; private set; }
public int Minutes { get; private set; }
public int Seconds { get; private set; }
public Time(uint h, uint m, uint s)
{
if(h > 23 || m > 59 || s > 59)
{
throw new ArgumentException("Invalid time specified");
}
Hours = (int)h; Minutes = (int)m; Seconds = (int)s;
}
public Time(DateTime dt)
{
Hours = dt.Hour;
Minutes = dt.Minute;
Seconds = dt.Second;
}
public override string ToString()
{
return String.Format(
"{0:00}:{1:00}:{2:00}",
this.Hours, this.Minutes, this.Seconds);
}
public void AddHours(uint h)
{
this.Hours += (int)h;
}
public void AddMinutes(uint m)
{
this.Minutes += (int)m;
while(this.Minutes > 59)
this.Minutes -= 60;
this.AddHours(1);
}
public void AddSeconds(uint s)
{
this.Seconds += (int)s;
while(this.Seconds > 59)
this.Seconds -= 60;
this.AddMinutes(1);
}
}
答案 6 :(得分:3)
System.TimeOfDay
类型最近被批准用于即将发布的 .NET 6。
见https://github.com/dotnet/runtime/issues/49036
完成后,这将是表示与任何特定日期或时区无关的时间值的首选方式。
System.TimeSpan
仍将是表示经过时间值的推荐方式。
答案 7 :(得分:1)
如果您不想使用DateTime或TimeSpan,并且只想存储一天中的时间,您可以将午夜的秒数存储在Int32中,或者(如果您甚至不想要秒数)从午夜开始的分钟将适合Int16。用这样的值编写访问小时,分钟和秒所需的几个方法是微不足道的。
我可以想到避免DateTime / TimeSpan的唯一原因是结构的大小是否很重要。
(当然,如果你使用像上面这样包含在类中的简单方案,那么如果你突然意识到这会给你一个优势,那么将来用TimeSpan替换存储也是微不足道的)
答案 8 :(得分:0)
这是功能齐全的TimeOfDay类。
在简单的情况下,这是矫kill过正,但是如果您需要像我一样的更高级的功能,则可能会有所帮助。
它可以处理极端情况,一些基本数学,比较,与DateTime的交互,解析等。
下面是TimeOfDay类的源代码。您可以查看用法示例并了解更多here:
此类使用DateTime进行大多数内部计算和比较,以便我们可以利用DateTime中已嵌入的所有知识。
// Author: Steve Lautenschlager, CambiaResearch.com
// License: MIT
using System;
using System.Text.RegularExpressions;
namespace Cambia
{
public class TimeOfDay
{
private const int MINUTES_PER_DAY = 60 * 24;
private const int SECONDS_PER_DAY = SECONDS_PER_HOUR * 24;
private const int SECONDS_PER_HOUR = 3600;
private static Regex _TodRegex = new Regex(@"\d?\d:\d\d:\d\d|\d?\d:\d\d");
public TimeOfDay()
{
Init(0, 0, 0);
}
public TimeOfDay(int hour, int minute, int second = 0)
{
Init(hour, minute, second);
}
public TimeOfDay(int hhmmss)
{
Init(hhmmss);
}
public TimeOfDay(DateTime dt)
{
Init(dt);
}
public TimeOfDay(TimeOfDay td)
{
Init(td.Hour, td.Minute, td.Second);
}
public int HHMMSS
{
get
{
return Hour * 10000 + Minute * 100 + Second;
}
}
public int Hour { get; private set; }
public int Minute { get; private set; }
public int Second { get; private set; }
public double TotalDays
{
get
{
return TotalSeconds / (24d * SECONDS_PER_HOUR);
}
}
public double TotalHours
{
get
{
return TotalSeconds / (1d * SECONDS_PER_HOUR);
}
}
public double TotalMinutes
{
get
{
return TotalSeconds / 60d;
}
}
public int TotalSeconds
{
get
{
return Hour * 3600 + Minute * 60 + Second;
}
}
public bool Equals(TimeOfDay other)
{
if (other == null) { return false; }
return TotalSeconds == other.TotalSeconds;
}
public override bool Equals(object obj)
{
if (obj == null) { return false; }
TimeOfDay td = obj as TimeOfDay;
if (td == null) { return false; }
else { return Equals(td); }
}
public override int GetHashCode()
{
return TotalSeconds;
}
public DateTime ToDateTime(DateTime dt)
{
return new DateTime(dt.Year, dt.Month, dt.Day, Hour, Minute, Second);
}
public override string ToString()
{
return ToString("HH:mm:ss");
}
public string ToString(string format)
{
DateTime now = DateTime.Now;
DateTime dt = new DateTime(now.Year, now.Month, now.Day, Hour, Minute, Second);
return dt.ToString(format);
}
public TimeSpan ToTimeSpan()
{
return new TimeSpan(Hour, Minute, Second);
}
public DateTime ToToday()
{
var now = DateTime.Now;
return new DateTime(now.Year, now.Month, now.Day, Hour, Minute, Second);
}
#region -- Static --
public static TimeOfDay Midnight { get { return new TimeOfDay(0, 0, 0); } }
public static TimeOfDay Noon { get { return new TimeOfDay(12, 0, 0); } }
public static TimeOfDay operator -(TimeOfDay t1, TimeOfDay t2)
{
DateTime now = DateTime.Now;
DateTime dt1 = new DateTime(now.Year, now.Month, now.Day, t1.Hour, t1.Minute, t1.Second);
TimeSpan ts = new TimeSpan(t2.Hour, t2.Minute, t2.Second);
DateTime dt2 = dt1 - ts;
return new TimeOfDay(dt2);
}
public static bool operator !=(TimeOfDay t1, TimeOfDay t2)
{
if (ReferenceEquals(t1, t2)) { return true; }
else if (ReferenceEquals(t1, null)) { return true; }
else
{
return t1.TotalSeconds != t2.TotalSeconds;
}
}
public static bool operator !=(TimeOfDay t1, DateTime dt2)
{
if (ReferenceEquals(t1, null)) { return false; }
DateTime dt1 = new DateTime(dt2.Year, dt2.Month, dt2.Day, t1.Hour, t1.Minute, t1.Second);
return dt1 != dt2;
}
public static bool operator !=(DateTime dt1, TimeOfDay t2)
{
if (ReferenceEquals(t2, null)) { return false; }
DateTime dt2 = new DateTime(dt1.Year, dt1.Month, dt1.Day, t2.Hour, t2.Minute, t2.Second);
return dt1 != dt2;
}
public static TimeOfDay operator +(TimeOfDay t1, TimeOfDay t2)
{
DateTime now = DateTime.Now;
DateTime dt1 = new DateTime(now.Year, now.Month, now.Day, t1.Hour, t1.Minute, t1.Second);
TimeSpan ts = new TimeSpan(t2.Hour, t2.Minute, t2.Second);
DateTime dt2 = dt1 + ts;
return new TimeOfDay(dt2);
}
public static bool operator <(TimeOfDay t1, TimeOfDay t2)
{
if (ReferenceEquals(t1, t2)) { return true; }
else if (ReferenceEquals(t1, null)) { return true; }
else
{
return t1.TotalSeconds < t2.TotalSeconds;
}
}
public static bool operator <(TimeOfDay t1, DateTime dt2)
{
if (ReferenceEquals(t1, null)) { return false; }
DateTime dt1 = new DateTime(dt2.Year, dt2.Month, dt2.Day, t1.Hour, t1.Minute, t1.Second);
return dt1 < dt2;
}
public static bool operator <(DateTime dt1, TimeOfDay t2)
{
if (ReferenceEquals(t2, null)) { return false; }
DateTime dt2 = new DateTime(dt1.Year, dt1.Month, dt1.Day, t2.Hour, t2.Minute, t2.Second);
return dt1 < dt2;
}
public static bool operator <=(TimeOfDay t1, TimeOfDay t2)
{
if (ReferenceEquals(t1, t2)) { return true; }
else if (ReferenceEquals(t1, null)) { return true; }
else
{
if (t1 == t2) { return true; }
return t1.TotalSeconds <= t2.TotalSeconds;
}
}
public static bool operator <=(TimeOfDay t1, DateTime dt2)
{
if (ReferenceEquals(t1, null)) { return false; }
DateTime dt1 = new DateTime(dt2.Year, dt2.Month, dt2.Day, t1.Hour, t1.Minute, t1.Second);
return dt1 <= dt2;
}
public static bool operator <=(DateTime dt1, TimeOfDay t2)
{
if (ReferenceEquals(t2, null)) { return false; }
DateTime dt2 = new DateTime(dt1.Year, dt1.Month, dt1.Day, t2.Hour, t2.Minute, t2.Second);
return dt1 <= dt2;
}
public static bool operator ==(TimeOfDay t1, TimeOfDay t2)
{
if (ReferenceEquals(t1, t2)) { return true; }
else if (ReferenceEquals(t1, null)) { return true; }
else { return t1.Equals(t2); }
}
public static bool operator ==(TimeOfDay t1, DateTime dt2)
{
if (ReferenceEquals(t1, null)) { return false; }
DateTime dt1 = new DateTime(dt2.Year, dt2.Month, dt2.Day, t1.Hour, t1.Minute, t1.Second);
return dt1 == dt2;
}
public static bool operator ==(DateTime dt1, TimeOfDay t2)
{
if (ReferenceEquals(t2, null)) { return false; }
DateTime dt2 = new DateTime(dt1.Year, dt1.Month, dt1.Day, t2.Hour, t2.Minute, t2.Second);
return dt1 == dt2;
}
public static bool operator >(TimeOfDay t1, TimeOfDay t2)
{
if (ReferenceEquals(t1, t2)) { return true; }
else if (ReferenceEquals(t1, null)) { return true; }
else
{
return t1.TotalSeconds > t2.TotalSeconds;
}
}
public static bool operator >(TimeOfDay t1, DateTime dt2)
{
if (ReferenceEquals(t1, null)) { return false; }
DateTime dt1 = new DateTime(dt2.Year, dt2.Month, dt2.Day, t1.Hour, t1.Minute, t1.Second);
return dt1 > dt2;
}
public static bool operator >(DateTime dt1, TimeOfDay t2)
{
if (ReferenceEquals(t2, null)) { return false; }
DateTime dt2 = new DateTime(dt1.Year, dt1.Month, dt1.Day, t2.Hour, t2.Minute, t2.Second);
return dt1 > dt2;
}
public static bool operator >=(TimeOfDay t1, TimeOfDay t2)
{
if (ReferenceEquals(t1, t2)) { return true; }
else if (ReferenceEquals(t1, null)) { return true; }
else
{
return t1.TotalSeconds >= t2.TotalSeconds;
}
}
public static bool operator >=(TimeOfDay t1, DateTime dt2)
{
if (ReferenceEquals(t1, null)) { return false; }
DateTime dt1 = new DateTime(dt2.Year, dt2.Month, dt2.Day, t1.Hour, t1.Minute, t1.Second);
return dt1 >= dt2;
}
public static bool operator >=(DateTime dt1, TimeOfDay t2)
{
if (ReferenceEquals(t2, null)) { return false; }
DateTime dt2 = new DateTime(dt1.Year, dt1.Month, dt1.Day, t2.Hour, t2.Minute, t2.Second);
return dt1 >= dt2;
}
/// <summary>
/// Input examples:
/// 14:21:17 (2pm 21min 17sec)
/// 02:15 (2am 15min 0sec)
/// 2:15 (2am 15min 0sec)
/// 2/1/2017 14:21 (2pm 21min 0sec)
/// TimeOfDay=15:13:12 (3pm 13min 12sec)
/// </summary>
public static TimeOfDay Parse(string s)
{
// We will parse any section of the text that matches this
// pattern: dd:dd or dd:dd:dd where the first doublet can
// be one or two digits for the hour. But minute and second
// must be two digits.
Match m = _TodRegex.Match(s);
string text = m.Value;
string[] fields = text.Split(':');
if (fields.Length < 2) { throw new ArgumentException("No valid time of day pattern found in input text"); }
int hour = Convert.ToInt32(fields[0]);
int min = Convert.ToInt32(fields[1]);
int sec = fields.Length > 2 ? Convert.ToInt32(fields[2]) : 0;
return new TimeOfDay(hour, min, sec);
}
#endregion
private void Init(int hour, int minute, int second)
{
if (hour < 0 || hour > 23) { throw new ArgumentException("Invalid hour, must be from 0 to 23."); }
if (minute < 0 || minute > 59) { throw new ArgumentException("Invalid minute, must be from 0 to 59."); }
if (second < 0 || second > 59) { throw new ArgumentException("Invalid second, must be from 0 to 59."); }
Hour = hour;
Minute = minute;
Second = second;
}
private void Init(int hhmmss)
{
int hour = hhmmss / 10000;
int min = (hhmmss - hour * 10000) / 100;
int sec = (hhmmss - hour * 10000 - min * 100);
Init(hour, min, sec);
}
private void Init(DateTime dt)
{
Init(dt.Hour, dt.Minute, dt.Second);
}
}
}