使用.NET 8预览版6构建项目时出现CS9057错误求助

数据老陈

2026-7-14

问题

基于**.NET 8.0.0-preview.6.16**版本创建新项目后，构建时出现以下错误：

Error CS9057 分析器程序集‘C:\Program Files\dotnet\sdk\8.0.100-preview.6.23330.14\Sdks\Microsoft.NET.Sdk.Razor\source-generators\Microsoft.NET.Sdk.Razor.SourceGenerators.dll’引用的编译器版本为4.7.0.0，比当前运行的版本4.6.0.0更高。

尝试手动更新Microsoft.NET.Sdk.Razor\source-generators至4.7.0.0版本，但未找到有效更新路径。

项目文件内容如下：

<PropertyGroup>
    <RootNamespace>House.Web</RootNamespace>
    <AssemblyName>House.Web</AssemblyName>
  </PropertyGroup>

  <ItemGroup>
    <ProjectReference Include="..\Application\Application.csproj" />
    <ProjectReference Include="..\Infrastructure\Infrastructure.csproj" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Azure.Extensions.AspNetCore.Configuration.Secrets" />
    <PackageReference Include="Azure.Identity" />
    <PackageReference Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" />
    <PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" />
    <PackageReference Include="Microsoft.AspNetCore.OpenApi" />
    <PackageReference Include="Microsoft.Extensions.Diagnostics.HealthChecks.EntityFrameworkCore" />
    <PackageReference Include="NSwag.AspNetCore" />
    <PackageReference Include="NSwag.MSBuild">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
    <PackageReference Include="FluentValidation.AspNetCore" />
    <PackageReference Include="ZymLabs.NSwag.FluentValidation.AspNetCore" />
  </ItemGroup>


  <!-- Auto-generated Open API specification and Angular TypeScript clients -->
  <PropertyGroup>
    <RunPostBuildEvent>OnBuildSuccess</RunPostBuildEvent>
  </PropertyGroup>

  <Target Name="NSwag" AfterTargets="PostBuildEvent" Condition=" '$(Configuration)' == 'Debug' And '$(SkipNSwag)' != 'True' ">
    <Exec ConsoleToMSBuild="true" ContinueOnError="true" WorkingDirectory="$(ProjectDir)" EnvironmentVariables="ASPNETCORE_ENVIRONMENT=Development" Command="$(NSwagExe_Net70) run config.nswag /variables:Configuration=$(Configuration)">
      <Output TaskParameter="ExitCode" PropertyName="NSwagExitCode" />
      <Output TaskParameter="ConsoleOutput" PropertyName="NSwagOutput" />
    </Exec>

    <Message Text="$(NSwagOutput)" Condition="'$(NSwagExitCode)' == '0'" Importance="low" />
    <Error Text="$(NSwagOutput)" Condition="'$(NSwagExitCode)' != '0'" />
  </Target>

</Project>

解决方案

升级.NET SDK版本：该错误由预览版SDK版本不匹配导致，下载安装高于8.0.100-preview.6.23330.14的.NET 8预览版SDK，新版本会同步更新编译器与Razor生成器版本，解决版本冲突。
强制指定编译器版本：在项目文件的<PropertyGroup>节点中添加以下配置，强制使用匹配的编译器版本：
```
<LangVersion>preview</LangVersion>
<RoslynVersion>4.7.0</RoslynVersion>
```
清理重建项目：执行以下命令清理项目缓存后重新构建：
```
dotnet clean
dotnet restore
dotnet build
```
统一依赖版本：确保所有Microsoft.AspNetCore.*相关包引用使用与.NET 8预览版匹配的版本，可在<PackageReference>中明确指定版本号，例如：
```
<PackageReference Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="8.0.0-preview.6.23329.7" />
```

内容的提问来源于stack exchange，提问作者Alaa Barakat