当项目引用存在时，不会填充项目元数据引用

我正在 MSBuildWorkspace 中加载解决方案：

var msWorkspace = MSBuildWorkspace.Create();
var solution = msWorkspace.OpenSolutionAsync(solutionPath).Result;

没有 ProjectReferences 的项目显示所有 MetadataReferences，包括 mscorlib。具有 ProjectReferences 的项目具有空的 MetadataReferences 集合。

当编译工作时，我猜编译器平台由于某种原因没有填充这个集合，我想知道为什么？ 如果我删除 ProjectReferences，MetadataReferences 集合将被正确填充。

编辑：诊断包含缺少 mscorlib 类型（如对象和日期时间）的错误，因此该项目似乎由于这些缺少的引用而无法编译。

我终于通过检查弄清楚发生了什么事.Diagnostics尝试打开解决方案后在 MSBuildWorkspace 对象上：

[Failure] Msbuild failed when processing the file 'c:\xxx\someproject.csproj' with message: C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\15.0\Bin\Roslyn\Microsoft.CSharp.Core.targets: (84, 5): The "Csc" task could not be instantiated from the assembly "C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\15.0\Bin\Roslyn\Microsoft.Build.Tasks.CodeAnalysis.dll". Please verify the task assembly has been built using the same version of the Microsoft.Build.Framework assembly as the one installed on your computer and that your host application is not missing a binding redirect for Microsoft.Build.Framework. Unable to cast object of type 'Microsoft.CodeAnalysis.BuildTasks.Csc' to type 'Microsoft.Build.Framework.ITask'.

似乎正在使用不同版本的 MSBuild。添加程序集重定向（复制自C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\15.0\Bin\MSBuild.exe.config）到我的项目 app.config 解决了它：

  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Build.Framework" culture="neutral" publicKeyToken="b03f5f7f11d50a3a" />
        <bindingRedirect oldVersion="0.0.0.0-99.9.9.9" newVersion="15.1.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Build" culture="neutral" publicKeyToken="b03f5f7f11d50a3a" />
        <bindingRedirect oldVersion="0.0.0.0-99.9.9.9" newVersion="15.1.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Build.Conversion.Core" culture="neutral" publicKeyToken="b03f5f7f11d50a3a" />
        <bindingRedirect oldVersion="0.0.0.0-99.9.9.9" newVersion="15.1.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Build.Tasks.Core" culture="neutral" publicKeyToken="b03f5f7f11d50a3a" />
        <bindingRedirect oldVersion="0.0.0.0-99.9.9.9" newVersion="15.1.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Build.Utilities.Core" culture="neutral" publicKeyToken="b03f5f7f11d50a3a" />
        <bindingRedirect oldVersion="0.0.0.0-99.9.9.9" newVersion="15.1.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Build.Engine" culture="neutral" publicKeyToken="b03f5f7f11d50a3a" />
        <bindingRedirect oldVersion="0.0.0.0-99.9.9.9" newVersion="15.1.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Build.Conversion.Core" culture="neutral" publicKeyToken="b03f5f7f11d50a3a" />
        <bindingRedirect oldVersion="0.0.0.0-99.9.9.9" newVersion="15.1.0.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>

现在，所有引用都已正确填充到解决方案中的每个项目上。

我使用的是 VS2017 15.7.1，目标是 .NET 4.7.1，因此在 Microsoft.CodeAnalysis 包之上不需要 NuGet 包（我使用的是 2.8.0）。