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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Text.RegularExpressions;
  4.  
  5. public class Version : IComparable<Version>
  6. {
  7.     public int[] Parts { get; }
  8.  
  9.     public Version(string value)
  10.     {
  11.         if (value == null)
  12.             throw new ArgumentNullException();
  13.         if (!Regex.IsMatch(value, @"^[0-9]+(\.[0-9]+)*$"))
  14.             throw new ArgumentException("Invalid format");
  15.         var parts = value.Split('.');
  16.         Parts = new int[parts.Length];
  17.         for (var i = 0; i < parts.Length; i++)
  18.             Parts[i] = int.Parse(parts[i]);
  19.     }
  20.  
  21.     public override string ToString()
  22.     {
  23.         return string.Join(".", Parts);
  24.     }
  25.  
  26.     public int CompareTo(Version that)
  27.     {
  28.         if (that == null) return 1;
  29.         var thisLength = this.Parts.Length;
  30.         var thatLength = that.Parts.Length;
  31.         var maxLength = Math.Max(thisLength, thatLength);
  32.         for (var i = 0; i < maxLength; i++)
  33.         {
  34.             var thisPart = i < thisLength ? this.Parts[i] : 0;
  35.             var thatPart = i < thatLength ? that.Parts[i] : 0;
  36.             if (thisPart < thatPart) return -1;
  37.             if (thisPart > thatPart) return 1;
  38.         }
  39.         return 0;
  40.     }
  41. }
  42.  
  43. public class Test
  44. {
  45. 	public static void Main()
  46. 	{
  47.         Version a, b;
  48.  
  49.         a = new Version("4.2.1");
  50.         b = new Version("4.2.6");
  51.         a.CompareTo(b); // a < b : -1
  52.  
  53.         a = new Version("2.8.4");
  54.         b = new Version("2.8.0");
  55.         a.CompareTo(b); // a > b : 1
  56.  
  57.         a = new Version("5.2");
  58.         b = null;
  59.         a.CompareTo(b); // a > null : 1
  60.  
  61.         a = new Version("3");
  62.         b = new Version("3.6");
  63.         a.CompareTo(b); // a < b : -1
  64.  
  65.         var versions = new List<Version>
  66.         {
  67.             new Version("2.0"),
  68.             new Version("1.1.5"),
  69.             new Version("3.0.10"),
  70.             new Version("1"),
  71.             null,
  72.             new Version("1.0.1")
  73.         };
  74.  
  75.         versions.Sort();
  76.  
  77.         foreach (var version in versions)
  78.             Console.WriteLine(version?.ToString() ?? "NULL");
  79. 	}
  80. }
Success #stdin #stdout 0.12s 24368KB
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stdin
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Standard input is empty
stdout
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NULL
1
1.0.1
1.1.5
2.0
3.0.10
https://ideone.com/MVXzUz
language:
C# (gmcs 5.20.1)
created:
7 years ago
visibility:
public

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