Change version number in a build script (from lionhack.com)

BuildCommon.targets

<?xml version="1.0" encoding="utf-8"?>
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <!--
    http://www.lionhack.com/2014/02/13/msbuild-override-assembly-version/
-->
  <PropertyGroup>
    <!-- This doesn't work -->
    <BeforeCompile>
      CommonBuildDefineModifiedAssemblyVersion;
      $(BeforeCompile);
    </BeforeCompile>
  </PropertyGroup>

  <!--This works -->
  <Target Name="BeforeCompile" DependsOnTargets="CommonBuildDefineModifiedAssemblyVersion">
  </Target>

  <!--
    Creates modified version of AssemblyInfo.cs, replaces [AssemblyVersion] attribute with the one specifying actual build version (from MSBuild properties), and includes that file instead of the original AssemblyInfo.cs in the compilation.

    Works with both, .cs and .vb version of the AssemblyInfo file, meaning it supports C# and VB.Net projects simultaneously.
-->
  <Target Name="CommonBuildDefineModifiedAssemblyVersion" Condition="'$(VersionAssembly)' != ''">
    <PropertyGroup>
      <CurrentDate>$([System.DateTime]::Now.ToString(yyyyMMdd HH:mm:ss))</CurrentDate>
    </PropertyGroup>
    <!-- Find AssemblyInfo.cs or AssemblyInfo.vb in the "Compile" Items. Remove it from "Compile" Items because we will use a modified version instead. -->
    <ItemGroup>
      <OriginalAssemblyInfo Include="@(Compile)" Condition="%(Filename) == 'AssemblyInfo' And (%(Extension) == '.vb' Or %(Extension) == '.cs')" />
      <Compile Remove="**/AssemblyInfo.vb" />
      <Compile Remove="**/AssemblyInfo.cs" />
    </ItemGroup>
    <!-- Copy the original AssemblyInfo.cs/.vb to obj\ folder, i.e. $(IntermediateOutputPath). The copied filepath is saved into @(ModifiedAssemblyInfo) Item. -->
    <Copy SourceFiles="@(OriginalAssemblyInfo)"
          DestinationFiles="@(OriginalAssemblyInfo->'$(IntermediateOutputPath)%(Identity)')">
      <Output TaskParameter="DestinationFiles" ItemName="ModifiedAssemblyInfo"/>
    </Copy>
    <!-- Replace the version bit (in AssemblyVersion and AssemblyFileVersion attributes) using regular expression. Use the defined property: $(VersionAssembly). -->
    <Message Text="Setting AssemblyVersion to $(VersionAssembly)" />
    <RegexUpdateFile Files="@(ModifiedAssemblyInfo)"
                Regex="Version\(&quot;(\d+)\.(\d+)(\.(\d+)\.(\d+)|\.*)&quot;\)"
                ReplacementText="Version(&quot;$(VersionAssembly)&quot;)"
                />
    <RegexUpdateFile Files="@(ModifiedAssemblyInfo)"
                Regex="AssemblyInformationalVersion\(&quot;Development build&quot;\)"
                ReplacementText="AssemblyInformationalVersion(&quot;$(Configuration) build on $(COMPUTERNAME) $(CurrentDate)&quot;)"
                />
    <!-- Include the modified AssemblyInfo.cs/.vb file in "Compile" items (instead of the original). -->
    <ItemGroup>
      <Compile Include="@(ModifiedAssemblyInfo)" />
    </ItemGroup>
  </Target>

<!-- for VS 2013 -->
<!--   <UsingTask TaskName="RegexUpdateFile" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v$(MSBuildToolsVersion).dll"> -->
<!-- for VS 2015 -->
  <UsingTask TaskName="RegexUpdateFile" TaskFactory="CodeTaskFactory" AssemblyFile="C:\Program Files (x86)\MSBuild\14.0\Bin\Microsoft.Build.Tasks.Core.dll">
    <ParameterGroup>
      <Files ParameterType="Microsoft.Build.Framework.ITaskItem[]" Required="true" />
      <Regex ParameterType="System.String" Required="true" />
      <ReplacementText ParameterType="System.String" Required="true" />
    </ParameterGroup>
    <Task>
      <Reference Include="System.Core" />
      <Using Namespace="System" />
      <Using Namespace="System.IO" />
      <Using Namespace="System.Text.RegularExpressions" />
      <Using Namespace="Microsoft.Build.Framework" />
      <Using Namespace="Microsoft.Build.Utilities" />
      <Code Type="Fragment" Language="cs">
        <![CDATA[
            try {
                var rx = new System.Text.RegularExpressions.Regex(this.Regex);
                for (int i = 0; i < Files.Length; ++i)
                {
                    var path = Files[i].GetMetadata("FullPath");
                    if (!File.Exists(path)) continue;

                    var txt = File.ReadAllText(path);
                    txt = rx.Replace(txt, this.ReplacementText);
                    File.WriteAllText(path, txt);
                }
                return true;
            }
            catch (Exception ex) {
                Log.LogErrorFromException(ex);
                return false;
            }
        ]]>
      </Code>
    </Task>
  </UsingTask>
</Project>