[Bug] Duplicate attributes with MSBuild task in WPF net5.0-windows project

[arp-mbender]

Describe the bug
After installing the MSBuild GitVersion task and removing all version information the project fails to compile due to duplicate version attribute errors.

Build output:

Build started...
1>------ Build started: Project: WpfApp1, Configuration: Debug Any CPU ------
1>C:\Users\mbender\Desktop\WpfApp1\WpfApp1\obj\Debug\net5.0-windows\WpfApp1_0fxhewp2_wpftmp.AssemblyInfo.cs(16,12,16,58): error CS0579: Duplicate 'System.Reflection.AssemblyFileVersionAttribute' attribute
1>C:\Users\mbender\Desktop\WpfApp1\WpfApp1\obj\Debug\net5.0-windows\WpfApp1_0fxhewp2_wpftmp.AssemblyInfo.cs(17,12,17,67): error CS0579: Duplicate 'System.Reflection.AssemblyInformationalVersionAttribute' attribute
1>C:\Users\mbender\Desktop\WpfApp1\WpfApp1\obj\Debug\net5.0-windows\WpfApp1_0fxhewp2_wpftmp.AssemblyInfo.cs(20,12,20,54): error CS0579: Duplicate 'System.Reflection.AssemblyVersionAttribute' attribute
1>Done building project "WpfApp1_0fxhewp2_wpftmp.csproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Expected Behavior

Following the basic tutorial I'd expect the project to compile and have GitVersion-calculated version information applied.

Actual Behavior

Project fails to compile.

Possible Fix

No clue.

Steps to Reproduce

1. Create a new .NET 5 WPF project (net5.0-windows)
2. Ensure that the new project is using GIT, i.e. create at least a local GIT repo
3. Install GitVersion.MsBuild Nuget
4. Ensure no version information is provided inside the project (a new project shouldn't have any information)
5. Attempt to compile the project

Context

Cannot use GitVersion in my project.

Your Environment

Windows Server 2019 Standard
GIT 2.32.0.windows.2
VS 2019
GitVersion.MsBuild 5.6.11

[arp-mbender]

I think I know what's going on - the MSBuild task isn't compatible with net5.0-windows...? I'm honestly not sure however.

[asbjornu]

Seems like a duplicate of #2512, #2278, #2226, #2163 and #1802.

[Crown0815]

@arp-mbender maybe try this

[arp-mbender]

Seems like a duplicate of #2512, #2278, #2226, #2163 and #1802.

Yup, that might be the case. I think updating the documentation on using GitVersion might in order to cull down on such questions. ;)

[asbjornu]

@arp-mbender, agreed. I just don't use the MSBuild task myself, so I wouldn't know what to document. If you or anyone else using the MSBuild task can provide the necessary documentation to alleviate problems like this, we would highly appreciate a pull request. 🙏🏼 The documentation resides in the docs directory of this very repository.

[asbjornu]

#2841 resolved this.