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MSBuild task to Increment the Build Number

As part of our internal build process we increment the last number on the build number by one each time the CI build runs.  Sounds simple right but I couldn’t find anywhere that did this simple task so I wrote one myself.  The code below works for VB and C# files and simply takes the AssemblyVersion number out of the provided AssemblyInfo.cs file and increments the last number.  It also provides formatted build numbers, the revision and the new build version as outputs.  You can also specify what you want the version to be, this is useful when you have multiple Assemblyinfo.cs files that you want to keep synchronised as we do with DotNetNuke.


To use the task add this to your MSBuild file

    <IncrementBuild FilePath="$(RootFolder)\Library\AssemblyInfo.cs" AutoIncrementVersion="true">
      <Output TaskParameter="BuildVersion" PropertyName="BuildVersion"></Output>
      <Output TaskParameter="FormattedBuildVersion" PropertyName="FormattedBuildVersion"></Output>
      <Output TaskParameter="Revision" PropertyName="Revision"></Output>
    <IncrementBuild FilePath="$(RootFolder)\Professional\AssemblyInfo.cs" DefaultVersion ="$(BuildVersion)"/>
You can see here that the first use of the task increments the build number and then the second use uses that output to set the version.


The code for the task is below and is getting better exception logging soon.

using System;
using System.IO;
using Microsoft.Build.Framework;
using Microsoft.Build.Utilities;

namespace DotNetNuke.MSBuild.Tasks
    public class IncrementBuild : Task
        private const string VbVersionStart = "<Assembly: AssemblyVersion";
        private const string VbVersionEnd = ")>";
        private const string CsVersionStart = "[assembly: AssemblyVersion";
        private const string CsVersionEnd = ")]";
        private string _versionStart = CsVersionStart;
        private string _versionEnd = CsVersionEnd;

        private string _filePath;
        public string FilePath
                if (_filePath.EndsWith("cs"))
                    _versionStart = CsVersionStart;
                    _versionEnd = CsVersionEnd;
                    _versionStart = VbVersionStart;
                    _versionEnd = VbVersionEnd;
                return _filePath;
            set { _filePath = value; }

        public bool AutoIncrementVersion { get; set; }
        public string DefaultVersion { get; set; }

        public string BuildVersion { get; set; }

        public string FormattedBuildVersion { get; set; }

        public string Revision { get; set; }

        public string ErrorCode { get; set; }

        public override bool Execute()
                if (_filePath == null)
                    return false;

                var content = File.ReadAllText(FilePath);
                var indexStart = content.IndexOf(_versionStart) + 28;
                var indexEnd = content.IndexOf(_versionEnd, indexStart);
                var versionNumber = content.Substring(indexStart, indexEnd - indexStart - 1);
                if (DefaultVersion != default(string))
                    versionNumber = DefaultVersion;
                var values = versionNumber.Split(".".ToCharArray());
                ErrorCode = versionNumber;
                int main;
                int minor;
                int version;
                int revision;
                int.TryParse(values[0], out main);
                int.TryParse(values[1], out minor);
                int.TryParse(values[2], out version);
                int.TryParse(values[3], out revision);
                if (AutoIncrementVersion)
                    revision = revision + 1;

                BuildVersion = String.Format("{0}.{1}.{2}.{3}", main, minor, version, revision);
                FormattedBuildVersion = String.Format("{0}.{1}.{2}", main.ToString("00"), minor.ToString("00"), version.ToString("00"));
                Revision = revision.ToString();
                if (AutoIncrementVersion || DefaultVersion != default(string))
                    var projectFileInfo = new FileInfo(FilePath) { IsReadOnly = false };
                    content = content.Replace(versionNumber, BuildVersion);
                    var newProjectFile = new StreamWriter(FilePath);
                    var projectFileInfo2 = new FileInfo(FilePath) { IsReadOnly = true };

                return true;

            catch (Exception ex)
                var file = new StreamWriter("F:\\Builds\\log.txt");
                return false;



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