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Roslyn Code Analysis从无错误的解决方案返回错误的构建错误

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我尝试使用Roslyn分析一个非常简单的C＃解决方案，这是一个具有简单框架程序的控制台应用程序：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CA5
{
    class Program
    {
        static void Main(string[] args)
        {
        }
    }
}

上面的代码在VS 2019 Preview中生成时没有任何错误。 对于这样一个简单的解决方案/程序，我希望Roslyn CA可以正常工作，但是Roslyn编译会返回错误，大多数与无法识别的类型有关。

我的CA代码是这样：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using microsoft.CodeAnalysis;
using microsoft.CodeAnalysis.MSBuild;

namespace CA5X
{
    class Program
    {
        static void Main(string[] args)
        {
            const string path = @"C:\Utils\CA5\CA5.sln";

            var props = new Dictionary<string,string>();
            props["CheckForSystemRuntimeDependency"] = "true";
            MSBuildWorkspace buildWorkspace = MSBuildWorkspace.Create(props);

            Solution solutionToAnalyze = buildWorkspace.OpenSolutionAsync(path).Result;
            foreach (microsoft.CodeAnalysis.Project sProject in solutionToAnalyze.Projects)
            {
                Compilation sCompilation = sProject.getcompilationAsync().Result;
                var errors = sCompilation.GetDiagnostics().Where(d => d.Severity == DiagnosticSeverity.Error); 

                Console.WriteLine("COUNT:  " + errors.Count().ToString());

                foreach (microsoft.CodeAnalysis.Diagnostic diagnostic in errors)
                {
                    Console.WriteLine(diagnostic.GetMessage());
                }

            }
        }
    }
}

编译后检索到的诊断信息如下：

The type or namespace name 'AssemblyTitleAttribute' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyTitle' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyDescriptionAttribute' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyDescription' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyConfigurationAttribute' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyConfiguration' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyCompanyAttribute' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyCompany' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyProductAttribute' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyProduct' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyCopyrightAttribute' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyCopyright' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyTrademarkAttribute' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyTrademark' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyCultureAttribute' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyCulture' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'ComVisibleAttribute' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'ComVisible' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'GuidAttribute' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'Guid' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyVersionAttribute' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyVersion' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyFileVersionAttribute' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'AssemblyFileVersion' could not be found (are you missing a using directive or an assembly reference?)
Predefined type 'System.String' is not defined or imported
The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?)
Predefined type 'System.Object' is not defined or imported
Predefined type 'System.String' is not defined or imported
Predefined type 'System.Void' is not defined or imported
'object' does not contain a constructor that takes 0 arguments

我只能猜测这是由于某些配置问题而发生的，但是对于这么多.NET版本和这么多VS版本，不可能尝试所有组合。

yishuitian1 回答：Roslyn Code Analysis从无错误的解决方案返回错误的构建错误

如果您将项目设置为使用MSBuildLocator，如下所示，则它应该能够加载您的项目：

SampleRoslynTool.csproj：

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net472</TargetFramework>
    <LangVersion>Latest</LangVersion>
  </PropertyGroup>

   <ItemGroup>
    <PackageReference Include="Microsoft.Build.Locator" Version="1.2.6" />
    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="2.9.7" PrivateAssets="all" />
    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="3.3.1" />
    <PackageReference Include="Microsoft.CodeAnalysis.VisualBasic.Workspaces" Version="3.3.1" />
    <PackageReference Include="Microsoft.CodeAnalysis.Workspaces.MSBuild" Version="3.3.1" />
  </ItemGroup>

</Project>

Program.cs：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Build.Locator;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Symbols;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.MSBuild;
using Microsoft.CodeAnalysis.Text;

namespace SampleRoslynTool
{
    class Program
    {
        static async Task Main(string[] args)
        {
            // Attempt to set the version of MSBuild.
            var visualStudioInstances = MSBuildLocator.QueryVisualStudioInstances().ToArray();
            var instance = visualStudioInstances.Length == 1
                // If there is only one instance of MSBuild on this machine,set that as the one to use.
                ? visualStudioInstances[0]
                // Handle selecting the version of MSBuild you want to use.
                : SelectVisualStudioInstance(visualStudioInstances);

            Console.WriteLine($"Using MSBuild at '{instance.MSBuildPath}' to load projects.");

            // NOTE: Be sure to register an instance with the MSBuildLocator 
            //       before calling MSBuildWorkspace.Create()
            //       otherwise,MSBuildWorkspace won't MEF compose.
            MSBuildLocator.RegisterInstance(instance);

            using (var workspace = MSBuildWorkspace.Create())
            {
                // Print message for WorkspaceFailed event to help diagnosing project load failures.
                workspace.WorkspaceFailed += (o,e) => Console.WriteLine(e.Diagnostic.Message);

                var solutionPath = args[0];
                Console.WriteLine($"Loading solution '{solutionPath}'");

                // Attach progress reporter so we print projects as they are loaded.
                var solution = await workspace.OpenSolutionAsync(solutionPath,new ConsoleProgressReporter());
                Console.WriteLine($"Finished loading solution '{solutionPath}'");

                // TODO: Do analysis on the projects in the loaded solution
            }
        }

        private static VisualStudioInstance SelectVisualStudioInstance(VisualStudioInstance[] visualStudioInstances)
        {
            Console.WriteLine("Multiple installs of MSBuild detected please select one:");
            for (int i = 0; i < visualStudioInstances.Length; i++)
            {
                Console.WriteLine($"Instance {i + 1}");
                Console.WriteLine($"    Name: {visualStudioInstances[i].Name}");
                Console.WriteLine($"    Version: {visualStudioInstances[i].Version}");
                Console.WriteLine($"    MSBuild Path: {visualStudioInstances[i].MSBuildPath}");
            }

            while (true)
            {
                var userResponse = Console.ReadLine();
                if (int.TryParse(userResponse,out int instanceNumber) &&
                    instanceNumber > 0 &&
                    instanceNumber <= visualStudioInstances.Length)
                {
                    return visualStudioInstances[instanceNumber - 1];
                }
                Console.WriteLine("Input not accepted,try again.");
            }
        }

        private class ConsoleProgressReporter : IProgress<ProjectLoadProgress>
        {
            public void Report(ProjectLoadProgress loadProgress)
            {
                var projectDisplay = Path.GetFileName(loadProgress.FilePath);
                if (loadProgress.TargetFramework != null)
                {
                    projectDisplay += $" ({loadProgress.TargetFramework})";
                }

                Console.WriteLine($"{loadProgress.Operation,-15} {loadProgress.ElapsedTime,-15:m\\:ss\\.fffffff} {projectDisplay}");
            }
        }
    }
}
,

我要感谢你的建议。

最终，我发现问题是由nuget软件包的混淆使用引起的。我的项目最初是针对DotNet Framework 4.5.2的，然后我添加了一些nuget程序包，VS自动切换到4.7.2，最终导致库的组合错误。由于我没有使用nuget的经验，因此我没有意识到也可以选择与目标DotNet框架兼容的特定版本。

在足够小心的情况下，我成功创建了正确的软件包组合，然后一切正常。

.netc#roslynroslyn-code-analysis
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