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  1. using System;
  2. using System.Globalization;
  3. using System.Linq;
  4. using System.Collections.Generic;
  5.  
  6. public class Test
  7. {
  8.    public static TimeSpan? TryParseTimeSpan(string input)
  9.     {
  10.         TimeSpan? ts = (TimeSpan?)null;
  11.         if (!String.IsNullOrEmpty(input))
  12.         {
  13.             input = input.Trim();
  14.             int length = input.Length % 2 == 0 ? input.Length : input.Length + 1;
  15.             int count = length / 2;
  16.  
  17.             if(count > 3) return null;
  18.  
  19.             input = input.PadLeft(count * 2, '0');
  20.  
  21.             string[] validFormats = new[] { "HHmmss", "mmss", "ss" };
  22.             DateTime dt;
  23.             if (DateTime.TryParseExact(input, validFormats, CultureInfo.InvariantCulture, DateTimeStyles.None, out dt))
  24.                 ts = dt.TimeOfDay; 
  25.         }
  26.         return ts;
  27.     } 
  28.  
  29. 	public static void Main()
  30. 	{
  31.          List<string> inputs = new List<string> { "78", "10545", "5" };
  32.             IEnumerable<TimeSpan> timeSpans = inputs
  33.                 .Select(i => TryParseTimeSpan(i))
  34.                 .Where(ts => ts.HasValue)
  35.                 .Select(ts => ts.Value);
  36.             foreach (TimeSpan ts in timeSpans)
  37.                 Console.WriteLine(ts.ToString());
  38.  
  39. 	}
  40. }
Success #stdin #stdout 0.06s 34024KB
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01:05:45
00:00:05
https://ideone.com/maguQ0
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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