C++/CLI 库 .NETFramework 到 .Net Standard

如何解决C++/CLI 库 .NETFramework 到 .Net Standard

以下是 C++/CLI 应用程序的 VS2019 项目文件。目标是将其从 .Net Framework 升级为 .Net Standard 2.0。

在我开始处理整个 log4net 参考之前，它一直在用 .Net Core 5.0 编译和链接 find。换句话说，.Net Core 5.0 并没有试图将 log4net 接口传递到这个库中，一切都很好。一旦传入，就会出现错误。旧的 log4net 参考已从该项目中撤出并替换为 .Net Standard 2.0。现在有这个错误：

warning MSB3268: The primary reference "log4net" Could not be resolved because it has an indirect dependency on the framework assembly "netstandard,Version=2.0.0.0,Culture=neutral,PublicKeyToken=cc7b13ffcd2ddd51" which Could not be resolved in the currently targeted framework. ".NETFramework,Version=v4.0". To resolve this problem,either remove the reference "log4net" or retarget your application to a framework version which contains "netstandard,PublicKeyToken=cc7b13ffcd2ddd51".
AFile.h(3): error C2871: 'log4net': a namespace with this name does not exist

我只是在项目文件中没有看到任何对 .Net Framework 或 .Net Standard 的引用。我该如何解决这个问题？

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  <PropertyGroup Label="Globals">
    <ProjectGuid>{9FAC29B5-62B2-4323-9469-921B467C8433}</ProjectGuid>
    <TargetFrameworkVersion>v4.6.2</TargetFrameworkVersion>
    <RootNamespace>theCppCliLibraryName</RootNamespace>
    <Keyword>ManagedCProj</Keyword>
    <WindowsTargetPlatformVersion>8.1</WindowsTargetPlatformVersion>
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    <OutDir>$(SolutionDir)$(Configuration)\</OutDir>
    <IntDir>$(Configuration)\</IntDir>
    <LinkIncremental>true</LinkIncremental>
    <LinkKeyFile>theCppCliLibraryName.snk</LinkKeyFile>
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    <OutDir>$(SolutionDir)$(Configuration)\</OutDir>
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      <precompiledHeader>Use</precompiledHeader>
      <WarningLevel>Level3</WarningLevel>
      <DebuginformationFormat>ProgramDatabase</DebuginformationFormat>
    </ClCompile>
    <Link>
      <AdditionalDependencies>LicenseLib2015MDd.lib</AdditionalDependencies>
      <AdditionalLibraryDirectories>../../lib;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
      <GenerateDebuginformation>true</GenerateDebuginformation>
      <AssemblyDebug>true</AssemblyDebug>
      <RandomizedBaseAddress>false</RandomizedBaseAddress>
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      <AdditionalDependencies>LicenseLib2015MD.lib</AdditionalDependencies>
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    <Reference Include="log4net">
      <HintPath>..\3rdPartyLibraries\log4net-2.0.8\bin\net\4.5\release\log4net.dll</HintPath>
    </Reference>
    <Reference Include="System">
      <copyLocalSatelliteAssemblies>true</copyLocalSatelliteAssemblies>
      <ReferenceOutputAssembly>true</ReferenceOutputAssembly>
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    <Reference Include="System.Drawing">
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    <ClCompile Include="AFile.cpp" />
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    <ClInclude Include="AFile.h" />
    <ClInclude Include="BFile.h">
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