内容纲要
背景：
调试测试 Debug 时需要使用 NSwag.AspNetCore ，提供 swagger 服务，但是正式发布部署，不需要用到。 NSwag.AspNetCore 的库文件达到6MB。
可以在项目文件中使用如下条件 Condition="'$(Configuration)'=='DEBUG'"
示例：
<PackageReference Condition="'$(Configuration)'=='DEBUG'" Include="NSwag.AspNetCore" Version="13.2.0" />大佬的示例
<Project>
<PropertyGroup>
<VersionMajor>1</VersionMajor>
<VersionMinor>8</VersionMinor>
<VersionPatch>2</VersionPatch>
<VersionRevision>0</VersionRevision>
<VersionPrefix Condition="'$(VersionRevision)'=='0'">$(VersionMajor).$(VersionMinor).$(VersionPatch)</VersionPrefix>
<VersionPrefix Condition="'$(VersionRevision)'!='0'">$(VersionMajor).$(VersionMinor).$(VersionPatch).$(VersionRevision)</VersionPrefix>
<VersionSuffix Condition="'$(Configuration)'=='DEBUG'">preview-$([System.DateTime]::Now.ToString("yyyyMMdd-HHmmss"))</VersionSuffix>
<InformationalVersion>$(PackageVersion)</InformationalVersion>
</PropertyGroup>
<PropertyGroup>
<LangVersion>latest</LangVersion>
<RepositoryType>git</RepositoryType>
<RepositoryUrl>https://github.com/WeihanLi/WeihanLi.Npoi</RepositoryUrl>
<!-- Optional: Publish the repository URL in the built .nupkg (in the NuSpec <Repository> element) -->
<PublishRepositoryUrl>true</PublishRepositoryUrl>
<!-- Optional: Build symbol package (.snupkg) to distribute the PDB containing Source Link -->
<IncludeSymbols>true</IncludeSymbols>
<SymbolPackageFormat>snupkg</SymbolPackageFormat>
<Authors>WeihanLi</Authors>
<Copyright>Copyright 2017-2019 (c) WeihanLi</Copyright>
<NoWarn>$(NoWarn);NU5048;</NoWarn>
</PropertyGroup>
<ItemGroup>
<PackageReference Condition="'$(OS)' == 'Windows_NT'" Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All"/>
<PackageReference Condition="'$(OS)' != 'Windows_NT'" Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0" PrivateAssets="All"/>
<PackageReference Include="JetBrains.Annotations" Version="2019.1.3" PrivateAssets="All" />
</ItemGroup>
</Project>地址：https://github.com/WeihanLi/WeihanLi.Npoi/blob/dev/Directory.Build.props
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检查编译常量中是否有某个常量