Getting a compile time error CS0579: Duplicate 'AssemblyFileVersionAttribute' attribute

Question

I recently added some copyright information to a set of C# projects (dlls) via the Properties->Application->Assembly Information button. I have several such projects in a single solution. Upon compilation I get error message of the type:

error CS0579: Duplicate 'XXX' attribute

where 'XXX' is the name of one of the attributes I specified (e.g. AssemblyFileVersionAttribute)

Googling I found that in the case of a class that is derived from the Attribute class, duplicates can be permitted by use of:

[System.AttributeUsage(System.AttributeTargets.All, AllowMultiple=true)]
class NewAttribute : System.Attribute { }

But in my case, I have added these attributes via the properties dialog and have statements (in AssemblyInfo.cs for each project) such as:

[assembly: AssemblyCompanyAttribute("My Company")]
[assembly: AssemblyProductAttribute("My Product")]
[assembly: AssemblyCopyrightAttribute("© 2012 My Company, All Rights Reserved.")]
[assembly: AssemblyVersionAttribute("13.0.0.0")]
[assembly: AssemblyFileVersionAttribute("1.0.0.0")]

and do not have any manually derived attribute classes I can attach any qualifiers to.

How do I solve this duplicate issue?

Answer 1

By adding this in .csproj file solved the issue

<PropertyGroup>
    <TargetFramework>netcoreapp2.1</TargetFramework>
    <GenerateAssemblyConfigurationAttribute>false</GenerateAssemblyConfigurationAttribute>
    <GenerateAssemblyDescriptionAttribute>false</GenerateAssemblyDescriptionAttribute>
    <GenerateAssemblyProductAttribute>false</GenerateAssemblyProductAttribute>
    <GenerateAssemblyTitleAttribute>false</GenerateAssemblyTitleAttribute>
</PropertyGroup>

As Bob suggested, if you don't want to add them individually, you can add

<GenerateAssemblyInfo>false</GenerateAssemblyInfo>   

to the <PropertyGroup>.

Answer 2

I think you already specified those attributes in Assembly Information window of Project Properties. If you did this, remove those attributes from the Assembly Information.