假设我像这样将一些秒数转换为TimeSpan对象:
Dim sec = 1254234568
Dim t As TimeSpan = TimeSpan.FromSeconds(sec)
我该如何将TimeSpan对象格式化为以下格式:
>105hr 56mn 47sec
有没有内置函数可以用,还是我需要编写自定义函数?
假设我像这样将一些秒数转换为TimeSpan对象:
Dim sec = 1254234568
Dim t As TimeSpan = TimeSpan.FromSeconds(sec)
>105hr 56mn 47sec
有没有内置函数可以用,还是我需要编写自定义函数?
好的,最简单的方法是自己进行格式化,例如:
return string.Format("{0}hr {1}mn {2}sec",
(int) span.TotalHours,
span.Minutes,
span.Seconds);
在 VB 中:
Public Shared Function FormatTimeSpan(span As TimeSpan) As String
Return String.Format("{0}hr {1}mn {2}sec", _
CInt(Math.Truncate(span.TotalHours)), _
span.Minutes, _
span.Seconds)
End Function
我不知道在.NET 4中是否有任何TimeSpan
格式化方法可以让这更简单。
2018年10月编辑:C# 6 / VB 14引入了插值字符串,可能比我原始答案的第一个代码段更简单。幸运的是,两种语言的插值语法相同:前面有$
。
TimeSpan t = new TimeSpan(105, 56, 47);
Console.WriteLine($"{(int)t.TotalHours}h {t:mm}mn {t:ss}sec");
dim t As New TimeSpan(105, 56, 47)
Console.WriteLine($"{CInt(Math.Truncate(t.TotalHours))}h {t:mm}mn {t:ss}sec")
2021年11月修订:上述答案仅适用于正的TimeSpan
和小于或等于-1
小时的负数。如果您有一个范围在(-1,0]小时
内的负TimeSpan
,您需要手动插入负号。请注意,这也适用于原始答案。
TimeSpan t = TimeSpan.FromSeconds(-30 * 60 - 10); // -(30mn 10 sec)
Console.WriteLine($"{(ts.Ticks < 0 && (int)ts.TotalHours == 0 ? "-" : "")}{(int)t.TotalHours}h {t:mm}mn {t:ss}sec");
由于这样很繁琐,我建议创建一个辅助函数。
string Neg(TimeSpan ts)
{
return ts.Ticks < 0 && (int)ts.TotalHours == 0 ? "-" : "";
}
TimeSpan t = TimeSpan.FromSeconds(-30 * 60 - 10); // -(30mn 10 sec)
Console.WriteLine($"{Neg(ts)}{(int)t.TotalHours}h {t:mm}mn {t:ss}sec");
我不够熟练,无法编写相应版本的VB代码。
在这里可以看到C#的一个快速示例here,其中包括C# 7中引入的ValueTuple
s特性。遗憾的是,我找到的唯一一个支持C#7的在线编译器运行的是.NET Core,对于小型示例来说非常麻烦,但请放心,在.NET Framework项目中它的工作方式完全相同。
微软目前没有针对此问题的简单格式字符串快捷方式。最简单的选项已经分享。
string.Format("{0}hr {1:mm}mn {1:ss}sec", (int)t.TotalHours, t);
String.Format("{0}hr {1:mm}mn {1:ss}sec", _
CInt(Math.Truncate(t.TotalHours)), _
t)
/// <summary>
/// Custom string formatter for TimeSpan that allows easy retrieval of Total segments.
/// </summary>
/// <example>
/// TimeSpan myTimeSpan = new TimeSpan(27, 13, 5);
/// string.Format("{0:th,###}h {0:mm}m {0:ss}s", myTimeSpan) -> "27h 13m 05s"
/// string.Format("{0:TH}", myTimeSpan) -> "27.2180555555556"
///
/// NOTE: myTimeSpan.ToString("TH") does not work. See Remarks.
/// </example>
/// <remarks>
/// Due to a quirk of .NET Framework (up through version 4.5.1),
/// <code>TimeSpan.ToString(format, new TimeSpanFormatter())</code> will not work; it will always call
/// TimeSpanFormat.FormatCustomized() which takes a DateTimeFormatInfo rather than an
/// IFormatProvider/ICustomFormatter. DateTimeFormatInfo, unfortunately, is a sealed class.
/// </remarks>
public class TimeSpanFormatter : IFormatProvider, ICustomFormatter
{
/// <summary>
/// Used to create a wrapper format string with the specified format.
/// </summary>
private const string DefaultFormat = "{{0:{0}}}";
/// <remarks>
/// IFormatProvider.GetFormat implementation.
/// </remarks>
public object GetFormat(Type formatType)
{
// Determine whether custom formatting object is requested.
if (formatType == typeof(ICustomFormatter))
{
return this;
}
return null;
}
/// <summary>
/// Determines whether the specified format is looking for a total, and formats it accordingly.
/// If not, returns the default format for the given <para>format</para> of a TimeSpan.
/// </summary>
/// <returns>
/// The formatted string for the given TimeSpan.
/// </returns>
/// <remarks>
/// ICustomFormatter.Format implementation.
/// </remarks>
public string Format(string format, object arg, IFormatProvider formatProvider)
{
// only apply our format if there is a format and if the argument is a TimeSpan
if (string.IsNullOrWhiteSpace(format) ||
formatProvider != this || // this should always be true, but just in case...
!(arg is TimeSpan) ||
arg == null)
{
// return the default for whatever our format and argument are
return GetDefault(format, arg);
}
TimeSpan span = (TimeSpan)arg;
string[] formatSegments = format.Split(new char[] { ',' }, 2);
string tsFormat = formatSegments[0];
// Get inner formatting which will be applied to the int or double value of the requested total.
// Default number format is just to return the number plainly.
string numberFormat = "{0}";
if (formatSegments.Length > 1)
{
numberFormat = string.Format(DefaultFormat, formatSegments[1]);
}
// We only handle two-character formats, and only when those characters' capitalization match
// (e.g. 'TH' and 'th', but not 'tH'). Feel free to change this to suit your needs.
if (tsFormat.Length != 2 ||
char.IsUpper(tsFormat[0]) != char.IsUpper(tsFormat[1]))
{
return GetDefault(format, arg);
}
// get the specified time segment from the TimeSpan as a double
double valAsDouble;
switch (char.ToLower(tsFormat[1]))
{
case 'd':
valAsDouble = span.TotalDays;
break;
case 'h':
valAsDouble = span.TotalHours;
break;
case 'm':
valAsDouble = span.TotalMinutes;
break;
case 's':
valAsDouble = span.TotalSeconds;
break;
case 'f':
valAsDouble = span.TotalMilliseconds;
break;
default:
return GetDefault(format, arg);
}
// figure out if we want a double or an integer
switch (tsFormat[0])
{
case 'T':
// format Total as double
return string.Format(numberFormat, valAsDouble);
case 't':
// format Total as int (rounded down)
return string.Format(numberFormat, (int)valAsDouble);
default:
return GetDefault(format, arg);
}
}
/// <summary>
/// Returns the formatted value when we don't know what to do with their specified format.
/// </summary>
private string GetDefault(string format, object arg)
{
return string.Format(string.Format(DefaultFormat, format), arg);
}
}
TimeSpan.ToString(format, myTimeSpanFormatter)
由于.NET Framework的一个怪异问题而无法使用,因此您始终需要使用string.Format(format, myTimeSpanFormatter)来使用这个类。请参阅如何创建和使用自定义IFormatProvider for DateTime?。TimeSpan.ToString(string, TimeSpanFormatter)
与此一起工作,您可以将以下内容添加到上面的TimeSpanFormatter
类:/// <remarks>
/// Update this as needed.
/// </remarks>
internal static string[] GetRecognizedFormats()
{
return new string[] { "td", "th", "tm", "ts", "tf", "TD", "TH", "TM", "TS", "TF" };
}
public static class TimeSpanFormatterExtensions
{
private static readonly string CustomFormatsRegex = string.Format(@"([^\\])?({0})(?:,{{([^(\\}})]+)}})?", string.Join("|", TimeSpanFormatter.GetRecognizedFormats()));
public static string ToString(this TimeSpan timeSpan, string format, ICustomFormatter formatter)
{
if (formatter == null)
{
throw new ArgumentNullException();
}
TimeSpanFormatter tsFormatter = (TimeSpanFormatter)formatter;
format = Regex.Replace(format, CustomFormatsRegex, new MatchEvaluator(m => MatchReplacer(m, timeSpan, tsFormatter)));
return timeSpan.ToString(format);
}
private static string MatchReplacer(Match m, TimeSpan timeSpan, TimeSpanFormatter formatter)
{
// the matched non-'\' char before the stuff we actually care about
string firstChar = m.Groups[1].Success ? m.Groups[1].Value : string.Empty;
string input;
if (m.Groups[3].Success)
{
// has additional formatting
input = string.Format("{0},{1}", m.Groups[2].Value, m.Groups[3].Value);
}
else
{
input = m.Groups[2].Value;
}
string replacement = formatter.Format(input, timeSpan, formatter);
if (string.IsNullOrEmpty(replacement))
{
return firstChar;
}
return string.Format("{0}\\{1}", firstChar, string.Join("\\", replacement.ToCharArray()));
}
}
ICustomFormatter formatter = new TimeSpanFormatter();
string myStr = myTimeSpan.ToString(@"TH,{000.00}h\:tm\m\:ss\s", formatter);
这里的 {000.00}
是你希望格式化 TotalHours 的整数或小数。注意大括号,它不应该出现在 string.Format() 中。此外,请注意,formatter
必须声明(或强制转换)为 ICustomFormatter
而不是 TimeSpanFormatter
。
过于冗长了吧?是的。很棒吗?嗯....
DateTime.ParseExact(input, format, formatProvder)
之间,可能有一个解决方案。 - dx_over_dtstring.Format("{0}小时 {1}分钟 {2}秒", (int) t.TotalHours, t.Minutes, t.Seconds);
{0:f0} ..., t.TotalHours, ...
。 - SLaksTimeSpan ts = TimeSpan.FromSeconds(1254234568);
Console.WriteLine($"{((int)ts.TotalHours).ToString("d2")}hr {ts.Minutes.ToString("d2")}mm {ts.Seconds.ToString("d2")}sec");
toString("d2")
与接受的答案相结合可以获得最佳结果。 - Grzegorz G.public TimeSpan SystemTime { get; set; }
public string SystemTimeAsString
{
get
{
// Note: ignoring fractional seconds.
return $"{(int)SystemTime.TotalHours}:SystemTime.Minutes.ToString("00")}:SystemTime.Seconds.ToString("00")}";
}
}
您可能希望考虑使用Noda Time的Duration
类型。
例如:
Duration d = Duration.FromSeconds(sec);
或者
Duration d = Duration.FromTimeSpan(ts);
然后,您可以将其格式化为字符串,如下所示:
string result = d.ToString("H'hr' m'mn' s'sec'", CultureInfo.InvariantCulture);
DurationPattern p = DurationPattern.CreateWithInvariantCulture("H'hr' m'mn' s'sec'");
string result = p.Format(d);
MS Excel有与.NET不同的其他格式。
请查看此链接http://www.paragon-inc.com/resources/blogs-posts/easy_excel_interaction_pt8
我创建了一个简单的函数,将TimeSpan转换为带有MS Excel格式的DateTime
public static DateTime MyApproach(TimeSpan time)
{
return new DateTime(1900, 1, 1).Add(time).AddDays(-2);
}
而且您需要像这样格式化单元格:
col.Style.Numberformat.Format = "[H]:mm:ss";
我的解决方案是:
string text = Math.Floor(timeUsed.TotalHours) + "h " + ((int)timeUsed.TotalMinutes) % 60 + "min";
尝试使用这个函数:
Public Shared Function GetTimeSpanString(ByVal ts As TimeSpan) As String
Dim output As New StringBuilder()
Dim needsComma As Boolean = False
If ts = Nothing Then
Return "00:00:00"
End If
If ts.TotalHours >= 1 Then
output.AppendFormat("{0} hr", Math.Truncate(ts.TotalHours))
If ts.TotalHours > 1 Then
output.Append("s")
End If
needsComma = True
End If
If ts.Minutes > 0 Then
If needsComma Then
output.Append(", ")
End If
output.AppendFormat("{0} m", ts.Minutes)
'If ts.Minutes > 1 Then
' output.Append("s")
'End If
needsComma = True
End If
Return output.ToString()
End Function
((int) span.TotalMinutes) % 60
可以替换为span.Minutes
。对于秒钟也是一样的。 - Lasse EspeholtMath.Truncate
而不是Math.Floor
有什么特别的原因吗?此外,String.Format
在没有额外的CInt
的情况下为我做了正确的事情。 我假设在 4.0 中使用TimeSpan
格式化时,这种情况还没有得到解决? - Jeff B