The item "Class1.cs" was specified more than once in the "Sources" parameter

[aL3891]

Hello,
While reproing NuGet/Home#4059 I ran into a strange issue with the latest cli, all the details are over there but basically, for a previously created class library I get

    1>Target "_GenerateCompileDependencyCache" in file "C:\Program Files\dotnet\sdk\1.0.0-rc4-004527\Microsoft.Common.CurrentVersion.targets" from project "C:\Users\Allan\Documents\Visual Studio 2017\Projects\ClassLibrary1\ClassLibrary1\ClassLibrary1.csproj" (target "Compile" depends on it):
       Added Item(s): CustomAdditionalCompileInputs=obj\Debug\netstandard1.6\CoreCompileInputs.cache
       Added Item(s): 
           CoreCompileCache=
               C:\Users\Allan\Documents\Visual Studio 2017\Projects\ClassLibrary1\ClassLibrary1\Class1.cs
               C:\Users\Allan\Documents\Visual Studio 2017\Projects\ClassLibrary1\ClassLibrary1\Class1.cs
               C:\Users\Allan\AppData\Local\Temp\.NETStandard,Version=v1.6.AssemblyAttributes.cs
       Added Item(s):  ...

and then

       (CoreCompile target) -> 
         C:\Program Files\dotnet\sdk\1.0.0-rc4-004527\Roslyn\Microsoft.CSharp.Core.targets(71,5): error MSB3105: The item "Class1.cs" was specified more than once in the "Sources" parameter.  Duplicate items are not supported by the "Sources" parameter. [C:\Users\Allan\Documents\Visual Studio 2017\Projects\ClassLibrary1\ClassLibrary1\ClassLibrary1.csproj]

Even though there is only one cs file in that project. Am I missing something obvious?

[aL3891]

ah, removing

  <ItemGroup>
    <Compile Include="**\*.cs" />
  </ItemGroup>

fixes the issue.

still, feels like this should be handled somehow or a lot of projects are going to break :)

[dsplaisted]

There is supposed to be a different error message that tells you that you don't need the Compile include in your file. It's not showing up in the intellisense build: #664

[dsplaisted]

Thinking more about it, it's possible that the reason you didn't get the right error message is because the CLI you are using doesn't have the changes from #624 which added it.

[aL3891]

Aha allright, that's what living on the edge gets ya :D
no worries, just wanted to make you aware of it :)

[enricforn]

@aL38891 which version of sdk contains the fix to this issue ?

@dsplaisted if I remove these lines, Visual Studio 2017 do not recognize the class as added to the project

[aL3891]

i'm using version 1.0.0-preview4-004233

[dsplaisted]

@dsplaisted if I remove these lines, Visual Studio 2017 do not recognize the class as added to the project

@enricforn We haven't released a version of Visual Studio with these changes yet. So right now what your .NET CLI supports and what your version of Visual Studio supports is out of sync.

[enricforn]

@dsplaisted ok, as a workaround we'll only compile through command line. It will be supported on the next RC ?

[bangonkali]

After removing all occurrences of

<Compile Include="**\*.cs" />

it works on VS 2017 RC3.

Then I also installed the following debs on our Linux Ubuntu Server so that it can build from the Linux Server:

https://dotnetcli.blob.core.windows.net/dotnet/preview/Installers/Latest/dotnet-host-ubuntu-x64.latest.deb
https://dotnetcli.blob.core.windows.net/dotnet/preview/Installers/Latest/dotnet-hostfxr-ubuntu-x64.latest.deb
https://dotnetcli.blob.core.windows.net/dotnet/preview/Installers/Latest/dotnet-sharedframework-ubuntu-x64.latest.deb
https://dotnetcli.blob.core.windows.net/dotnet/Sdk/rel-1.0.0/dotnet-sdk-ubuntu-x64.latest.deb

I used this call

wget https://dotnetcli.blob.core.windows.net/dotnet/preview/Installers/Latest/dotnet-host-ubuntu-x64.latest.deb && \
wget https://dotnetcli.blob.core.windows.net/dotnet/preview/Installers/Latest/dotnet-hostfxr-ubuntu-x64.latest.deb && \
wget https://dotnetcli.blob.core.windows.net/dotnet/preview/Installers/Latest/dotnet-sharedframework-ubuntu-x64.latest.deb && \
wget https://dotnetcli.blob.core.windows.net/dotnet/Sdk/rel-1.0.0/dotnet-sdk-ubuntu-x64.latest.deb && \
sudo dpkg -i "dotnet-host-ubuntu-x64.latest.deb" && sudo apt-get install -f && \
sudo dpkg -i "dotnet-hostfxr-ubuntu-x64.latest.deb" && sudo apt-get install -f && \
sudo dpkg -i "dotnet-sharedframework-ubuntu-x64.latest.deb" && sudo apt-get install -f && \
sudo dpkg -i "dotnet-sdk-ubuntu-x64.latest.deb" && sudo apt-get install -f