**linux**下构建需要设置环境变量**NUGET_XMLDOC_MODE = none**，在官方文档中有解释NUGET_XMLDOC_MODE的作用
    然后修改csproj, 添加如下代码, 构建和发布都会将NuGet包中所有的xml和pdb文件拷贝到输出目录了。

    1. <Target Name="CopyReferenceFiles" BeforeTargets="Build">
    2.   <ItemGroup>
    3.     <ReferenceFiles Include="%(Reference.RelativeDir)%(Reference.Filename).xml;" />
    4.   </ItemGroup>
    6.   <Message Text="Copying reference files to $(OutputPath)" Importance="High" />
    7.   <Copy SourceFiles="@(ReferenceFiles)" DestinationFolder="$(OutputPath)" Condition="Exists('%(RootDir)%(Directory)%(Filename)%(Extension)')" />
    8. </Target>
    10. <Target Name="CopyReferenceFiles" BeforeTargets="PrepareForPublish">
    11.   <ItemGroup>
    12.     <ReferenceFiles Include="%(Reference.RelativeDir)%(Reference.Filename).xml;" />
    13.   </ItemGroup>
    15.   <Message Text="Copying reference files to $(OutputPath)" Importance="High" />
    16.   <Copy SourceFiles="@(ReferenceFiles)" DestinationFolder="$(PublishDir)" Condition="Exists('%(RootDir)%(Directory)%(Filename)%(Extension)')" />
    17. </Target>