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• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used?
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Description

When generating a client using the csharp-netcore generator with a targetFramework of netcoreapp2.0, there is an unexpected ItemGroup in the generated csproj file:

  <ItemGroup>
    <Reference Include="System" />
    <Reference Include="System.Core" />
    <Reference Include="System.Xml.Linq" />
    <Reference Include="System.Data.DataSetExtensions" />
    <Reference Include="System.ComponentModel.DataAnnotations" />
    <Reference Include="Microsoft.CSharp" />
    <Reference Include="System.Data" />
    <Reference Include="System.Runtime.Serialization" />
    <Reference Include="System.Xml" />
  </ItemGroup>

It doesn't seem like the references in this ItemGroup are necessary, and seem to be generating a warning on compilation:

Microsoft.Common.CurrentVersion.targets(2110, 5): [MSB3245] Could not resolve this reference. Could not locate the assembly "System.Data.DataSetExtensions". Check to make sure the assembly exists on disk. If this reference is required by your code, you may get compilation errors.

If this entire ItemGroup is removed, the code compiles successfully and this warning is not generated.

openapi-generator version

4.1.0

OpenAPI declaration file content or url

I used the test yaml here: https://github.com/OpenAPITools/openapi-generator/blob/v4.1.0/modules/openapi-generator/src/test/resources/2_0/petstore-with-fake-endpoints-models-for-testing.yaml

Command line used for generation

openapi-generator generate -g csharp-netcore -i ./petstore-with-fake-endpoints-models-for-testing.yaml --additional-properties targetFramework=netcoreapp2.0 -o ./netcoreapp2.0

Steps to reproduce

Run the command line above and look at the generated Org.OpenAPITools.csproj file. Build the project to see the compilation warning.

Related issues/PRs

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