Azure Pipeline for NuGet Pack 任务使用 SDK 格式时出错，.csproj该格式会自动生成.nuspec文件：
The process cannot access the file 'D:\a\1\a\*.nupkg' because it is being used by another process.
System.IO.IOException: The process cannot access the file 'D:\a\1\a\*.nupkg' because it is being used by another process.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.File.InternalDelete(String path, Boolean checkHost)
at NuGet.Commands.PackCommandRunner.BuildPackage(PackageBuilder builder, String outputPath, Boolean symbolsPackage)
at NuGet.Commands.PackCommandRunner.BuildFromProjectFile(String path)
at NuGet.CommandLine.PackCommand.ExecuteCommand()
at NuGet.CommandLine.Command.ExecuteCommandAsync()
at NuGet.CommandLine.Command.Execute()
at NuGet.CommandLine.Program.MainCore(String workingDirectory, String[] args))
##[error]An error occurred while trying to pack the files.
.csproj正在构建的文件使用TargetsForTfmSpecificBuildOutput：
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>netstandard2.0</TargetFramework>
<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
<GeneratePackageOnBuild>true</GeneratePackageOnBuild>
<Description>Provides a .....</Description>
</PropertyGroup>
<PropertyGroup>
<TargetsForTfmSpecificBuildOutput>$(TargetsForTfmSpecificBuildOutput);CopyProjectReferencesToPackage</TargetsForTfmSpecificBuildOutput>
</PropertyGroup>
<Target Name="CopyProjectReferencesToPackage" DependsOnTargets="BuildOnlySettings;ResolveReferences">
<ItemGroup>
<!-- Filter out unnecessary files -->
<_ReferenceCopyLocalPaths Include="@(ReferenceCopyLocalPaths->WithMetadataValue('ReferenceSourceTarget', 'ProjectReference')->WithMetadataValue('PrivateAssets', 'All'))" />
</ItemGroup>
<!-- Print batches for debug purposes -->
<Message Text="Batch for .nupkg: ReferenceCopyLocalPaths = @(_ReferenceCopyLocalPaths), ReferenceCopyLocalPaths.DestinationSubDirectory = %(_ReferenceCopyLocalPaths.DestinationSubDirectory) Filename = %(_ReferenceCopyLocalPaths.Filename) Extension = %(_ReferenceCopyLocalPaths.Extension)" Importance="High" Condition="'@(_ReferenceCopyLocalPaths)' != ''" />
<ItemGroup>
<!-- Add file to package with consideration of sub folder. If empty, the root folder is chosen. -->
<BuildOutputInPackage Include="@(_ReferenceCopyLocalPaths)" TargetPath="%(_ReferenceCopyLocalPaths.DestinationSubDirectory)" />
</ItemGroup>
</Target>
.csproj由于需要构建 legacydll不能自行打包，因此需要对文件进行上述修改。但基于这个答案：https ://stackoverflow.com/a/59893520/1231374
注意：删除自定义包步骤仍然会导致错误。
在此之前还有一个额外的错误，不确定这是否相关。
Error NU5128: Some target frameworks declared in the dependencies group of the nuspec and the lib/ref folder do not have exact matches in the other location. Consult the list of actions below:
- Add a dependency group for .NETStandard2.0 to the nuspec
请参阅下面的任务配置：
请参阅 Nuget 安装程序任务，这是安装程序运行的第一个任务：
