我从罗斯林仪测试情况下，下面的错误从以下项目如何编写引用DOTNET标准2.0项目
https://github.com/Weingartner/Migrations.Json.Net
预计集合是空的，但发现罗斯林分析仪{Test0.cs（5,2）：错误 CS0012：'属性'类型在不是 引用的程序集中定义。您必须添加对组件'netstandard的引用， Version = 2.0.0.0，Culture = neutral，PublicKeyToken = cc7b13ffcd2ddd51'。}。
在DiagnosticVerifier.Helper.cs的当前元数据的引用是
private static readonly MetadataReference CorlibReference = MetadataReference.CreateFromFile(typeof(object).Assembly.Location);
private static readonly MetadataReference SystemReference = MetadataReference.CreateFromFile(typeof(System.Uri).Assembly.Location);
private static readonly MetadataReference SystemCoreReference = MetadataReference.CreateFromFile(typeof(Enumerable).Assembly.Location);
private static readonly MetadataReference CSharpSymbolsReference = MetadataReference.CreateFromFile(typeof(CSharpCompilation).Assembly.Location);
private static readonly MetadataReference CodeAnalysisReference = MetadataReference.CreateFromFile(typeof(Compilation).Assembly.Location);
private static readonly MetadataReference SystemRuntimeReference = MetadataReference.CreateFromFile(Assembly.Load("System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a").Location);
private static readonly MetadataReference MigrationReference = MetadataReference.CreateFromFile(typeof(MigratableAttribute).Assembly.Location);
private static readonly MetadataReference SerializationReference = MetadataReference.CreateFromFile(typeof(DataMemberAttribute).Assembly.Location);
private static readonly MetadataReference JsonNetReference = MetadataReference.CreateFromFile(typeof(Newtonsoft.Json.JsonConvert).Assembly.Location);
其中引用
private static readonly MetadataReference MigrationReference =
MetadataReference
.CreateFromFile(typeof(MigratableAttribute).Assembly.Location);
指子项目Weingartner.Json.Migration的
这个项目是一个dotnetstandard 2.0项目
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>netstandard2.0</TargetFramework>
<RootNamespace>Weingartner.Json.Migration</RootNamespace>
<AssemblyName>Weingartner.Json.Migration</AssemblyName>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
</ItemGroup>
<ItemGroup>
<ProjectReference Include="..\Weingartner.Json.Migration.Common_\Weingartner.Json.Migration.Common.csproj" />
</ItemGroup>
</Project>
然而，当我运行分析仪的测试案例，我感到我应该引用netstandard
预计集合是空的运行时错误，但发现{Test0.cs（5,2）：错误 CS0012：类型'属性'是在不是 引用的程序集中定义的。您必须添加对组件'netstandard的引用， Version = 2.0.0.0，Culture = neutral，PublicKeyToken = cc7b13ffcd2ddd51'。}。 在FluentAssertions.Execution.XUnit2TestFramework.Throw（字符串 消息）在 FluentAssertions.Execution.AssertionScope.FailWith（字符串消息， 对象[]参数）在 FluentAssertions.Execution.GivenSelector
1.FailWith(String message, Object[] args) at FluentAssertions.Collections.CollectionAssertions2.BeEmpty（字符串 因为，对象[] becauseArgs）在 TestHelper.DiagnosticVerifier.CreateProject（字符串[]来源，字符串 语言）在TestHelper.DiagnosticVerifier.GetDocuments（字符串[] 源，在 TestHelper.DiagnosticVerifier.GetSortedDiagnostics字符串语言）（字符串[]来源， String language，DiagnosticAnalyzer分析器） TestHelper.DiagnosticVerifier.VerifyDiagnostics（St在 TestHelper.DiagnosticVerifier.VerifyCSharpDiagnostic（字符串源环[]来源， 字符串的语言，DiagnosticAnalyzer分析器，DiagnosticResult [] 预期）， 预期DiagnosticResult []）在 Weingartner.Json.Migration.Roslyn.Spec.DataContractAnalyzerSpec.ShouldCreateDiagnosticIfMigratableTypeDoesntHaveDataContractAttributeSet （）
我的猜测是我在创建项目时忽略了一些东西。我看不到一个API来指定我定位的框架的版本，但API非常大，所以我可能错过了一些东西。
private static Project CreateProject(string[] sources, string language = LanguageNames.CSharp)
{
string fileNamePrefix = DefaultFilePathPrefix;
string fileExt = language == LanguageNames.CSharp ? CSharpDefaultFileExt : VisualBasicDefaultExt;
var projectId = ProjectId.CreateNewId(debugName: TestProjectName);
var solution = new AdhocWorkspace()
.CurrentSolution
.AddProject(projectId, TestProjectName, TestProjectName, language)
.AddMetadataReference(projectId, CorlibReference)
.AddMetadataReference(projectId, SystemReference)
.AddMetadataReference(projectId, SystemCoreReference)
.AddMetadataReference(projectId, CSharpSymbolsReference)
.AddMetadataReference(projectId, CodeAnalysisReference)
.AddMetadataReference(projectId, SystemRuntimeReference)
.AddMetadataReference(projectId, MigrationReference)
.AddMetadataReference(projectId, SerializationReference)
.AddMetadataReference(projectId, JsonNetReference);
var compilationOptions = solution
.GetProject(projectId)
.CompilationOptions
.WithOutputKind(OutputKind.DynamicallyLinkedLibrary);
solution = solution
.WithProjectCompilationOptions(projectId, compilationOptions);
int count = 0;
foreach (var source in sources)
{
var newFileName = fileNamePrefix + count + "." + fileExt;
var documentId = DocumentId.CreateNewId(projectId, debugName: newFileName);
solution = solution.AddDocument(documentId, newFileName, SourceText.From(source));
count++;
}
var project = solution.GetProject(projectId);
var diangostics = project.GetCompilationAsync().Result.GetDiagnostics();
diangostics.Should().BeEmpty();
return project;
}