NuGet unable to extract metadata from assembly with XmlnsDefinitionAttribute

Question

I am trying to add XmlnsDefinitionAttributes to my assembly. I use TeamCity to manage my projects. There is a NuGet Package Pack step in my build configuration.

Here is the relevant section of a failed build log.

[16:42:08]: Starting: C:\Windows\system32\cmd.exe /c C:\BuildAgent\tools\NuGet.CommandLine.1.5.20905.5.nupkg\tools\NuGet.exe pack C:\BuildAgent\work\5f0e65f22ca1527\MyProject\MyProject.csproj -OutputDirectory \\server\Packages -BasePath C:\BuildAgent\work\5f0e65f22ca1527 -Verbose -Version 1.0.97.1034 -Symbols -Properties Configuration=Release
[16:42:08]: in directory: C:\BuildAgent\work\5f0e65f22ca1527
[16:42:08]: Attempting to build package from 'MyProject.csproj'.
[16:42:09]: Packing files from 'C:\BuildAgent\work\5f0e65f22ca1527\MyProject\Bin\Release'.
[16:42:09]: WARNING: Unable to extract metadata from 'MyProject.dll'.
[16:42:09]: Using 'MyProject.nuspec' for metadata.
[16:42:09]: The replacement token 'title' has no value.
[16:42:09]: Process exited with code 1

The same section for a successful build looks like this.

[16:42:54]: Starting: C:\Windows\system32\cmd.exe /c C:\BuildAgent\tool\NuGet.CommandLine.1.5.20905.5.nupkg\tools\NuGet.exe pack C:\BuildAgent\work\5f0e65f22ca1527\MyProject\MyProject.csproj -OutputDirectory \\server\Packages -BasePath C:\BuildAgent\work\5f0e65f22ca1527 -Verbose -Version 1.0.98.1035 -Symbols -Properties Configuration=Release
[16:42:54]: in directory: C:\BuildAgent\work\5f0e65f22ca1527
[16:42:54]: Attempting to build package from 'MyProject.csproj'.
[16:42:54]: Packing files from 'C:\BuildAgent\work\5f0e65f22ca1527\MyProject\Bin\Release'.
[16:42:54]: Using 'MyProject.nuspec' for metadata.

At this point it outputs all of the settings.

My XmlnsDefinitionAttribute is defined in AssemblyInfo.cs as follows

[assembly: XmlnsDefinition("http://schemas.company.com/myproject", "MyProject")]

Any ideas as to what I am doing wrong?

Edit

Here is my full AssemblyInfo.cs

using System.Reflection;
using System.Runtime.InteropServices;
using System.Windows.Markup;

[assembly: AssemblyTitle("MyProject")]
[assembly: AssemblyDescription("MyProject Description")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("Microsoft")]
[assembly: AssemblyProduct("MyProject")]
[assembly: AssemblyCopyright("Copyright © Microsoft 2011")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]

[assembly: ComVisible(false)]

[assembly: Guid("23774732-4f22-4366-a150-03745e93111b")]

[assembly: AssemblyVersion("1.5.2")]
[assembly: AssemblyFileVersion("1.5.2")]

[assembly: XmlnsDefinition("http://schemas.company.com/myproject", "MyProject")]
[assembly: XmlnsDefinition("http://schemas.company.com/myproject", "MyProject.Namespace1")]
[assembly: XmlnsDefinition("http://schemas.company.com/myproject/newschema", "MyProject.NewSchema")]
[assembly: XmlnsDefinition("http://schemas.company.com/myproject/newschema", "MyProject.NewSchema.Namespace1")]

Edit 2

I installed NuGet locally and I am getting the same error. TeamCity does not appear to have any effect.

Answer 1

Nuget will try to get metadata from the assembly, and by doing do, it will load all assembly attributes.

This issue occurs because XmlnsDefinition is defined in System.Windows assembly (System.Windows.dll), and that particular assembly is normally not outputed to the build folder, so NuGet can't find it and throws an exception (you can only spot the exception if you run NuGet from code!)

Best way I found to bypass this issue is to make sure the System.Windows.dll file is in the same folder as the main assembly when you run NuGet.exe

Answer 2

A solution is to compile with Platform set to AnyCPU.