versioncomparison_dll_visualstudio/VersionComparison/VersionComparison.cs

using System;
using System.IO;
using System.Linq;
using System.Reflection;

namespace Eugen.ESystem
{
    public class VersionComparison
    {
        #region Version und Copyright
        // Version und Copyright
        static string dllName = Path.GetFileNameWithoutExtension(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase); //Den Programmnamen auslesen
        static string dllVersion = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version.ToString();
        static object[] attributes = Assembly.GetExecutingAssembly().GetCustomAttributes(typeof(AssemblyCopyrightAttribute), false);
        static string copyright = GenerateCopyright();

        //Assembly Datum und Zeit
        static DateTime value = AssemblyDateTime();
        static string date = value.ToShortDateString();
        static string time = value.ToLongTimeString();

        private static DateTime AssemblyDateTime()
        {
            var version = System.Reflection.Assembly.GetExecutingAssembly().GetName().Version;
            var buildDateTime = new DateTime(2000, 1, 1).Add(new TimeSpan(TimeSpan.TicksPerDay * version.Build + TimeSpan.TicksPerSecond * 2 * version.Revision));
            //Tage seit dem 1. Januar 2000 und Sekunden seit Mitternacht, (multiplizier mit 2 ergibt das Original)
            return buildDateTime;
        }

        private static string CurrentYear()
        {
            DateTime dtn = DateTime.Now;
            return dtn.Year.ToString();
        }

        private static string StartYear()
        {
            string startYear = "";
            if (((AssemblyCopyrightAttribute)attributes[0]).Copyright.Contains("Copyright © "))
            {
                startYear = ((AssemblyCopyrightAttribute)attributes[0]).Copyright.Replace("Copyright © ", "");
                while (startYear.StartsWith(" "))
                {
                    startYear = startYear.Remove(0, 1);
                }

                if (startYear.Contains("-"))
                {
                    startYear = startYear.Remove(startYear.IndexOf("-"));
                }
                else
                {
                    startYear = startYear.Remove(startYear.IndexOf(" "));
                }
                return startYear;
            }
            else
            {
                DateTime dtn = DateTime.Now;
                return dtn.Year.ToString();
            }
        }

        private static string GenerateCopyright()
        {
            string startYear = StartYear();
            string currentYear = CurrentYear();

            if (startYear == currentYear)
            {
                return ((AssemblyCopyrightAttribute)attributes[0]).Copyright;
            }
            else
            {
                string temp = ((AssemblyCopyrightAttribute)attributes[0]).Copyright;
                string start = temp.Remove(temp.IndexOf(startYear) - 1);
                string end = (temp.Remove(0, temp.IndexOf(" by")));

                return String.Concat(start, " ", startYear, "-", currentYear, end);
            }
        }
        #endregion

        #region DLL-Info
        /// <summary>
        /// Contains the name of the dll file.
        /// </summary>
        public static string DllName { private set; get; }

        /// <summary>
        /// Contains the version of the dll file.
        /// </summary>
        public static string DllVersion { private set; get; }

        /// <summary>
        /// Contains the copyright notice.
        /// </summary>
        public static string Copyright { private set; get; }

        /// <summary>
        /// Contains the name-, version- and copyright-information of the dll file.
        /// </summary>
        public static string[] DllInfo { private set; get; }

        private static void SetDllInfo()
        {
            //Name, Version und Copyright setzen
            DllName = dllName;
            DllVersion = dllVersion;
            Copyright = copyright;

            string[] dllInfo = new string[3];
            dllInfo[0] = dllName;
            dllInfo[1] = dllVersion;
            dllInfo[2] = copyright;
            DllInfo = dllInfo;
        }

        protected string ProgramName { private set; get; }
        protected string ProgramVersion { private set; get; }
        protected string ProgramCopyright { private set; get; }
        #endregion

        static VersionComparison()
        {
            SetDllInfo();
        }

        /// <summary>
        /// Compare a specified version with the version of an app
        /// </summary>
        /// <param name="version">String formatted as 'Majorversion.Minorversion.Buildnumber.Revision'.</param>
        /// <param name="appVersion">A valid App version, e.g.: ShowTextFile.DllVersion</param>
        /// <returns>-1 = No valid comparison
        /// 0 = Both versions the same
        /// 1 = 'version' is newer than app version
        /// 2 = Version of the app is newer than 'version'</returns>
        public static int Compare(string version, string appVersion)
        {
            if (!IsVersionValid(version) || String.IsNullOrEmpty(appVersion))
            {
                return -1;
            }

            string[] versionSegment = version.Split('.');
            string[] appVersionSegment = appVersion.Split('.');

            if (version == appVersion)
            {
                return 0; // Versionen sind gleich
            }

            // Vergleich Hauptversion
            if (Convert.ToInt16(versionSegment[0]) > Convert.ToInt16(appVersionSegment[0]))
            {
                return 1; //'version' neuer als 'appVersion'
            }
            if (Convert.ToInt16(versionSegment[0]) < Convert.ToInt16(appVersionSegment[0]))
            {
                return 2; //'appVersion' neuer als 'version'
            }

            // Vergleich Nebenversion
            if (Convert.ToInt16(versionSegment[1]) > Convert.ToInt16(appVersionSegment[1]))
            {
                return 1; //'version' neuer als 'appVersion'
            }
            if (Convert.ToInt16(versionSegment[1]) < Convert.ToInt16(appVersionSegment[1]))
            {
                return 2; //'appVersion' neuer als 'version'
            }

            // Vergleich Buildnummer
            if (Convert.ToInt16(versionSegment[2]) > Convert.ToInt16(appVersionSegment[21]))
            {
                return 1; //'version' neuer als 'appVersion'
            }
            if (Convert.ToInt16(versionSegment[2]) < Convert.ToInt16(appVersionSegment[2]))
            {
                return 2; //'appVersion' neuer als 'version'
            }

            // Vergleich Revision
            if (Convert.ToInt16(versionSegment[3]) > Convert.ToInt16(appVersionSegment[3]))
            {
                return 1; //'version' neuer als 'appVersion'
            }
            if (Convert.ToInt16(versionSegment[3]) < Convert.ToInt16(appVersionSegment[3]))
            {
                return 2; //'appVersion' neuer als 'version'
            }

            return -1; //Kein gültiger Vergleich
        }

        private static bool IsVersionValid(string version)
        {
            if (String.IsNullOrEmpty(version) || CountPoints(version) != 3)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

        private static int CountPoints(string version)
        {
            return version.Count(c => c == '.'); //Zeichen zählen mit Linq
        }
    }
}