Version class

Version.cs

using System;
using System.Linq;

namespace RoyalMobileApps.XF.Helpers
{
	public struct Version
	{
		private readonly int[] parts;

		public Version(string version)
		{
			if(string.IsNullOrWhiteSpace(version))
			{
				parts = new int[0];
				return;
			}

			parts = version.Trim()				// remove whitespace
				.Split('.')						// to string[]
				.Select(s => int.Parse(s))		// to int[] - may throw an exception
				.ToArray();
		}

		public static explicit operator Version(string version)
		{
			return new Version(version);
		}

		public override bool Equals(object obj)
		{
			if (!(obj is Version))
				return false;

			var other = (Version)obj;
			return this == other;
		}

		public override int GetHashCode()
		{
			return parts.GetHashCode();
		}

		public override string ToString()
		{
			return string.Join(".", parts);
		}

		#region Comparissons

		public static bool operator ==(Version a, Version b) { return Compare(a, b) == 0; }
		public static bool operator !=(Version a, Version b) { return Compare(a, b) != 0; }
		public static bool operator < (Version a, Version b) { return Compare(a, b) < 0; }
		public static bool operator > (Version a, Version b) { return Compare(a, b) > 0; }
		public static bool operator <=(Version a, Version b) { return Compare(a, b) <= 0; }
		public static bool operator >=(Version a, Version b) { return Compare(a, b) >= 0; }

		/// <summary>
		/// Compares the given Versions
		/// </summary>
		/// <param name="a"></param>
		/// <param name="b"></param>
		/// <returns>-1 if a is smaller, 0 if they are equal and 1 if a is bigger</returns>
		private static int Compare(Version a, Version b)
		{
			int i = 0;
			var l = Math.Min(a.parts.Length, b.parts.Length);
			while (i < l && a.parts[i] == b.parts[i])
				i++;

			if(i<l) // they didn't match
				return a.parts[i] < b.parts[i] ? -1 : 1;

			// at least one of the Versions is at its end, check there is anything but 0 remaining
			if (l < a.parts.Length && a.parts.Skip(l).Any(v => v != 0)) // a is longer && there are non zero numbers in it => a is bigger
				return 1;
			if (l < b.parts.Length && b.parts.Skip(l).Any(v => v != 0)) // b is longer && there are non zero numbers in it => b is bigger
				return -1;

			return 0;
		}

		#endregion Comparissons
	}
}