Auto-increment build numbers in Visual Studio

You need to auto-increment your build numbers in order to easily tell which code you’re working with.

In this article I’ll explain how to auto-increment your build numbers in Visual Studio. I’ll be using text templating to generate the Assembly Version.

1 – Choose a versioning scheme

I’m going to be using the version scheme: <Major Version>.<Minor Version>.<Days Since Project Started>.<Minutes Since Midnight>. You should use whatever makes sense for you.

The one rule you must adhere to is the numbers must be <= 65534 (because they are 16-bit). If you generate a number greater than 65534, you’ll get a build error:

CS7034  The specified version string does not conform to the required format - major[.minor[.build[.revision]]] 

There are 86400 seconds per day and 1440 minutes per day. This is why I chose Minutes Since Midnight instead of Seconds Since Midnight. Since 86400 > the limit of 65534, using seconds would sometimes result in the build error shown above. By using minutes, this cannot happen.

2 – Comment out the assembly version properties

Open AssemblyInfo.cs and comment out AssemblyVersion and AssemblyFileVersion.

3 – Add a Text Template file

A Text Template is used to generate code. We’ll be using this to generate the assembly version.

After you add this file you’ll get a warning prompt. Since you’re the one adding this file, you can check the box and click OK.

4 – Update the Text Template to generate the AssemblyVersion property

There’s two parts to the text template:

  1. Specifying the template using placeholder variables.
  2. Populating the placeholder variables.
<#@ template debug="false" hostspecific="false" language="C#" #>
<#@ output extension=".cs" #>

using System.Reflection;

[assembly: AssemblyVersion("<#= this.Major #>.<#= this.Minor #>.<#= this.DaysSinceProjectStarted #>.<#= this.MinutesSinceMidnight  #>")]


 int Major = 1;
 int Minor = 0;
 static DateTime ProjectStartedDate = new DateTime(year: 2020, month: 3, day: 12);
 int DaysSinceProjectStarted = (int)((DateTime.UtcNow - ProjectStartedDate).TotalDays);

 int MinutesSinceMidnight = (int)DateTime.UtcNow.TimeOfDay.TotalMinutes;


5 – Build the project

When you build the project it’ll execute the text template. This generates a source file with the AssemblyVersion property.

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