mac/linux `dotnet build` 找不到框架“.NETFramework..”的参考程序集

Question

当尝试构建面向 net47 而不是 .netcore 或 .net std 的 Microsoft.NET.Sdk 样式项目时。将dotnet build给出有关缺少目标包的错误。msbuild 可以代替，但我更喜欢使用dotnet build. 有办法吗。

/usr/local/share/dotnet/sdk/2.1.200/Microsoft.Common.CurrentVersion.targets
(1179,5): error MSB3644: The reference assemblies for framework 
".NETFramework,Version=v4.7" were not found. To resolve this, install the
 SDK or Targeting Pack for this framework version or retarget your application to a version of the framework for which you have the SDK or
 Targeting Pack installed. Note that assemblies will be resolved from the
 Global Assembly Cache (GAC) and will be used in place of reference 
assemblies. Therefore your assembly may not be correctly targeted for the 
framework you intend.

Answer 1

有一个解决方案不需要依赖MyGet；添加此道具导入：

   <TargetFramework>net472</TargetFramework>
   <OutDir>bin</OutDir>
 </PropertyGroup>
+<Import Project="netfx.props" />
 <ItemGroup>

然后将此netfx.props文件包含在您的解决方案中：

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (c) Microsoft Corporation.  All Rights Reserved.  See License.txt in the project root for license information. -->
<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <!-- When compiling .NET SDK 2.0 projects targeting .NET 4.x on Mono using 'dotnet build' you -->
    <!-- have to teach MSBuild where the Mono copy of the reference asssemblies is -->
    <TargetIsMono Condition="($(TargetFramework.StartsWith('net4')) OR $(TargetFrameworkVersion.StartsWith('v4.'))) AND '$(OS)' == 'Unix'">true</TargetIsMono>

    <!-- Look in the standard install locations -->
    <BaseFrameworkPathOverrideForMono Condition="'$(BaseFrameworkPathOverrideForMono)' == '' AND '$(TargetIsMono)' == 'true' AND EXISTS('/Library/Frameworks/Mono.framework/Versions/Current/lib/mono')">/Library/Frameworks/Mono.framework/Versions/Current/lib/mono</BaseFrameworkPathOverrideForMono>
    <BaseFrameworkPathOverrideForMono Condition="'$(BaseFrameworkPathOverrideForMono)' == '' AND '$(TargetIsMono)' == 'true' AND EXISTS('/usr/lib/mono')">/usr/lib/mono</BaseFrameworkPathOverrideForMono>
    <BaseFrameworkPathOverrideForMono Condition="'$(BaseFrameworkPathOverrideForMono)' == '' AND '$(TargetIsMono)' == 'true' AND EXISTS('/usr/local/lib/mono')">/usr/local/lib/mono</BaseFrameworkPathOverrideForMono>

    <!-- If we found Mono reference assemblies, then use them -->
    <FrameworkPathOverride Condition="'$(BaseFrameworkPathOverrideForMono)' != '' AND ('$(TargetFramework)' == 'net45' OR '$(TargetFrameworkVersion)' == 'v4.5')">$(BaseFrameworkPathOverrideForMono)/4.5-api</FrameworkPathOverride>
    <FrameworkPathOverride Condition="'$(BaseFrameworkPathOverrideForMono)' != '' AND ('$(TargetFramework)' == 'net451' OR '$(TargetFrameworkVersion)' == 'v4.5.1')">$(BaseFrameworkPathOverrideForMono)/4.5.1-api</FrameworkPathOverride>
    <FrameworkPathOverride Condition="'$(BaseFrameworkPathOverrideForMono)' != '' AND ('$(TargetFramework)' == 'net452' OR '$(TargetFrameworkVersion)' == 'v4.5.2')">$(BaseFrameworkPathOverrideForMono)/4.5.2-api</FrameworkPathOverride>
    <FrameworkPathOverride Condition="'$(BaseFrameworkPathOverrideForMono)' != '' AND ('$(TargetFramework)' == 'net46' OR '$(TargetFrameworkVersion)' == 'v4.6')">$(BaseFrameworkPathOverrideForMono)/4.6-api</FrameworkPathOverride>
    <FrameworkPathOverride Condition="'$(BaseFrameworkPathOverrideForMono)' != '' AND ('$(TargetFramework)' == 'net461' OR '$(TargetFrameworkVersion)' == 'v4.6.1')">$(BaseFrameworkPathOverrideForMono)/4.6.1-api</FrameworkPathOverride>
    <FrameworkPathOverride Condition="'$(BaseFrameworkPathOverrideForMono)' != '' AND ('$(TargetFramework)' == 'net462' OR '$(TargetFrameworkVersion)' == 'v4.6.2')">$(BaseFrameworkPathOverrideForMono)/4.6.2-api</FrameworkPathOverride>
    <FrameworkPathOverride Condition="'$(BaseFrameworkPathOverrideForMono)' != '' AND ('$(TargetFramework)' == 'net47' OR '$(TargetFrameworkVersion)' == 'v4.7')">$(BaseFrameworkPathOverrideForMono)/4.7-api</FrameworkPathOverride>
    <FrameworkPathOverride Condition="'$(BaseFrameworkPathOverrideForMono)' != '' AND ('$(TargetFramework)' == 'net471' OR '$(TargetFrameworkVersion)' == 'v4.7.1')">$(BaseFrameworkPathOverrideForMono)/4.7.1-api</FrameworkPathOverride>
    <FrameworkPathOverride Condition="'$(BaseFrameworkPathOverrideForMono)' != '' AND ('$(TargetFramework)' == 'net472' OR '$(TargetFrameworkVersion)' == 'v4.7.2')">$(BaseFrameworkPathOverrideForMono)/4.7.2-api</FrameworkPathOverride>
    <EnableFrameworkPathOverride Condition="'$(BaseFrameworkPathOverrideForMono)' != ''">true</EnableFrameworkPathOverride>

    <!-- Add the Facades directory.  Not sure how else to do this. Necessary at least for .NET 4.5 -->
    <AssemblySearchPaths Condition="'$(BaseFrameworkPathOverrideForMono)' != ''">$(FrameworkPathOverride)/Facades;$(AssemblySearchPaths)</AssemblySearchPaths>
  </PropertyGroup>

  <ItemGroup Condition="'$(TargetFramework)'== 'net472' OR '$(TargetFrameworkVersion)' == 'v4.7.2'">
    <Reference Include="netstandard" />
  </ItemGroup>
</Project>

（以此为基础。）