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msbuild - MSBuildWorkspace 无法编译项目到另一个项目

问题描述

注意我也在Roslyn 的 GitHub 上问过这个问题（带有复制代码）

请注意，我已经尝试将 net461、netcoreapp2.1 和 netstandard2.0 作为项目的目标框架——每次都出现同样的问题。

static async Task Main(string[] args)
{
    MSBuildLocator.RegisterDefaults();
    using (var workspace = MSBuildWorkspace.Create())
    {
        workspace.WorkspaceFailed += (sender, workspaceFailedArgs) => WriteLine(workspaceFailedArgs.Diagnostic.Message);
        var solution = await workspace.OpenSolutionAsync(@"c:\source\ForRoslynTest\ForRoslynTest.sln");
        WriteLine($"Loaded solution {solution.FilePath}");

        var projectTree = workspace.CurrentSolution.GetProjectDependencyGraph();
        foreach (var projectId in projectTree.GetTopologicallySortedProjects())
        {
            await CompileProject(workspace.CurrentSolution.GetProject(projectId));
        }
    }
}

private static async Task CompileProject(Project project)
{
    WriteLine($"Compiling {project.Name}. It has {project.MetadataReferences.Count} metadata references.");
    var compilation = await project.GetCompilationAsync();
    var errors = compilation.GetDiagnostics().Where(diagnostic => diagnostic.Severity == DiagnosticSeverity.Error);
    if (errors.Any())
    {
        WriteLine($"COMPILATION ERROR: {compilation.AssemblyName}: {errors.Count()} compilation errors: \n\t{string.Join("\n\t", errors.Where(e => false).Select(e => e.ToString()))}");
    }
    else
    {
        WriteLine($"Project {project.Name} compiled with no errors");
    }
}

您将收到以下输出：

Msbuild failed when processing the file 'c:\source\ForRoslynTest\DownstreamLibrary\DownstreamLibrary.csproj' with message: C:\Program Files\dotnet\sdk\2.1.602\Microsoft.Common.CurrentVersion.targets: (1548, 5): The "Microsoft.Build.Tasks.ResolveNonMSBuildProjectOutput" task could not be loaded from the assembly Microsoft.Build.Tasks.Core, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a.  Confirm that the <UsingTask> declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask.

Found project reference without a matching metadata reference: c:\source\ForRoslynTest\CoreLibrary\CoreLibrary.csproj

Loaded solution c:\source\ForRoslynTest\ForRoslynTest.sln

Compiling CoreLibrary. It has 113 metadata references.
Project CoreLibrary compiled with no errors

Compiling DownstreamLibrary. It has 0 metadata references.
COMPILATION ERROR: DownstreamLibrary: 3 compilation errors:
        c:\source\ForRoslynTest\DownstreamLibrary\Class1.cs(1,7): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?)
        c:\source\ForRoslynTest\DownstreamLibrary\Class1.cs(5,18): error CS0518: Predefined type 'System.Object' is not defined or imported
        c:\source\ForRoslynTest\DownstreamLibrary\Class1.cs(5,18): error CS1729: 'object' does not contain a constructor that takes 0 arguments

所以我的问题是如何修复上述错误并让 DownstreamLibrary 进行编译？

编辑 我 99% 确定根本原因是这个错误

无法从程序集 Microsoft.Build.Tasks.Core 加载“Microsoft.Build.Tasks.ResolveNonMSBuildProjectOutput”任务，版本 = 15.1.0.0

我已经用 procmon 确认它正在加载以下 DLL (C:\Program Files\dotnet\sdk\2.1.602\Microsoft.Build.Tasks.Core.dll)，我用 ILSpy 确认了它没有ResolveNonMSBuildProjectOutput里面的任务。此 DLL 的旧版本确实有此任务。

标签： msbuildroslynroslyn-code-analysis

解决方案

我找到了此 WorkspaceFailed 错误的手动解决方法：

[失败] 处理 with 消息时 Msbuild 失败：无法从程序集 Microsoft.Build.Tasks.Core 加载“Microsoft.Build.Tasks.ResolveNonMSBuildProjectOutput”任务，版本=15.1.0.0，文化=中性，PublicKeyToken=b03f5f7f11d50a3a . 确认声明正确，程序集及其所有依赖项都可用，并且任务包含实现 Microsoft.Build.Framework.ITask 的公共类。

有几个解决步骤：

  1. 在https://github.com/microsoft/msbuild/issues/4770之后，我将 VS 2019 从 16.2 更新到 16.5.3 ...这并没有解决我的错误，但值得记录我这样做。
  2. 我将我的 Microsoft.Build.* 和 Microsoft.CodeAnalysis 依赖项升级到最新版本，这还没有解决问题，同样的错误。
  3. 我导航到以前有几个目录的 C:\Program Files\dotnet\sdk：
1.0.0/                  1.0.0-rc4-004771/  2.0.3/    2.1.505/
1.0.0-preview1-002702/  1.0.3/             2.1.202/  3.1.100/
1.0.0-preview2-003121/  1.0.4/             2.1.4/    3.1.201/
1.0.0-preview4-004233/  1.1.0/             2.1.502/  NuGetFallbackFolder/
  1. 我将其重命名为 sdk_o 并创建了一个新文件夹 C:\Program Files\dotnet\sdk，仅复制到 3.1.201/

成功！这个错误消失了，但是运行我的 roslyn 应用程序然后导致一些错误，比如（路径被剥离）

[失败] 处理文件时 Msbuild 失败，消息“ProcessFrameworkReferences”任务意外失败。System.IO.FileNotFoundException：无法加载文件或程序集“NuGet.Frameworks，版本=5.5.0.4，文化=中性，PublicKeyToken=31bf3856ad364e35”。该系统找不到指定的文件。文件名：'NuGet.Frameworks，版本=5.5.0.4，文化=中性，PublicKeyToken=31bf3856ad364e35'

通过将 NuGet.ProjectModel 5.5.1 添加到我的项目中解决了这个问题，csproj 现在具有以下包引用：

   <ItemGroup>
     <PackageReference Include="Microsoft.Build" Version="16.5.0" ExcludeAssets="runtime" />
     <PackageReference Include="Microsoft.Build.Framework" Version="16.5.0" ExcludeAssets="runtime" />
     <PackageReference Include="Microsoft.Build.Locator" Version="1.2.6" />
     <PackageReference Include="Microsoft.Build.Tasks.Core" Version="16.5.0" ExcludeAssets="runtime" />
     <PackageReference Include="Microsoft.CodeAnalysis" Version="3.5.0" />
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="3.5.0" />
     <PackageReference Include="Microsoft.CodeAnalysis.Workspaces.MSBuild" Version="3.5.0" />
     <PackageReference Include="NuGet.ProjectModel" Version="5.5.1" />
   </ItemGroup>

此代码不再有 WorkspaceFailed 事件：

Microsoft.Build.Locator.MSBuildLocator.RegisterDefaults();
var workspace = MSBuildWorkspace.Create();
workspace.WorkspaceFailed += (s, e) => { Console.WriteLine(e.Diagnostic); };
var project = await workspace.OpenProjectAsync(@"C:/path/to.csproj");

我使用 Roslyn 加载的 csproj 如下所示：

<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
      <TargetFramework>netcoreapp3.1</TargetFramework>
      <UseWindowsForms>true</UseWindowsForms>
      <OutputType>Library</OutputType>
      <ApplicationIcon />
      <StartupObject />
   </PropertyGroup>

   <ItemGroup>
      <ProjectReference Include="..\..\dependencies\some.csproj" />
   </ItemGroup>
</Project>

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