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.NET Standard: Duplicate 'System.Reflection.AssemblyCompanyAttribute' attribute

In a ‘classic’ .NET project, you have an AssemblyInfo.cs file.

image

This file contains all kind of information about your assembly

using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
// General Information about an assembly is controlled through the following
// set of attributes. Change these attribute values to modify the information
// associated with an assembly.
[assembly: AssemblyTitle("standardsample")]
[assembly: AssemblyDescription("")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("Ordina")]
[assembly: AssemblyProduct("standardsample")]
[assembly: AssemblyCopyright("Copyright © Ordina 2017")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
// Setting ComVisible to false makes the types in this assembly not visible
// to COM components. If you need to access a type in this assembly from
// COM, set the ComVisible attribute to true on that type.
[assembly: ComVisible(false)]
// The following GUID is for the ID of the typelib if this project is exposed to COM
[assembly: Guid("c68e1cff-6cdd-4a1b-bdde-e78542a2cb66")]
// Version information for an assembly consists of the following four values:
//
// Major Version
// Minor Version
// Build Number
// Revision
//
// You can specify all the values or you can default the Build and Revision Numbers
// by using the '*' as shown below:
// [assembly: AssemblyVersion("1.0.*")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyFileVersion("1.0.0.0")]
view raw AssemblyInfo.cs hosted with ❤ by GitHub

After upgrading a classic .NET project to .NET Standard, I started to get errors about some of the properties inside the AssemblyInfo.cs file:

image

A .NET Standard project already has the AssemblyInfo information built-in. So after upgrading you end up with 2 AssemblyInfo specifications, leading to the errors above.

The solution is to remove the original AssemblyInfo.cs file in the Properties folder.

Remark: If you want to change the assembly information, you now have to use the Package tab inside your Project Properties.

image

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