Azure Pipelines中dotnet publish找不到apphost.exe问题求助

错误信息 #

/opt/hostedtoolcache/dotnet/sdk/6.0.412/Microsoft.Common.CurrentVersion.targets(5097,5): error MSB3030: Could not copy the file "/home/vsts/work/1/s/src/Api.Web/obj/Release/net6.0/win-x64/apphost.exe" because it was not found. [/home/vsts/work/1/s/src/Api.Web/Api.Web.csproj]

环境配置 #

Azure Pipelines步骤配置 #

pool:
  vmImage: 'windows-latest'

variables:
  solution: '**/*.sln'
  buildPlatform: 'Any CPU'
  buildConfiguration: 'Release'

steps:
- task: UseDotNet@2
  displayName: 'Setting dotnet SDK'
  inputs:
    packageType: 'sdk'
    version: '6.x'

- task: NuGetToolInstaller@1
  inputs:
    versionSpec: '6.x'

- task: NuGetCommand@2
  displayName: 'NuGet restore'
  inputs:
    command: 'restore'
    restoreSolution: '$(solution)'
    feedsToUse: 'select'
    vstsFeed: 'c77b2597-5a55-4944-9a41-faeef2a74d81'

- task: DotNetCoreCLI@2
  displayName: Build Solution
  inputs:
    command: 'build'
    projects: '$(solution)'
    arguments: '--no-restore --configuration $(buildConfiguration)'

- task: DotNetCoreCLI@2
  displayName: Publish to artifactstagingdirectory
  inputs:
    command: publish
    publishWebProjects: false
    projects: |
      **/Api.Web.csproj
    arguments: '-f net6.0 --self-contained false --no-restore --r win-x64 --output $(Build.Artifactstagingdirectory)/$(Build.BuildNumber) --configuration $(buildConfiguration)'
    zipAfterPublish: false

- task: PublishBuildArtifacts@1
  displayName: Publish artifacts
  inputs:
    PathtoPublish: '$(Build.ArtifactStagingDirectory)'
    artifactName: 'api'

Api.Web.csproj内容 #

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

    <PropertyGroup>
        <TargetFramework>net6.0</TargetFramework>
        <Nullable>disable</Nullable>
        <ImplicitUsings>enable</ImplicitUsings>
        <Configurations>Debug;Release;Development;Test</Configurations>
        <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
        <RuntimeIdentifiers>win-x64</RuntimeIdentifiers>
        
        <RestorePackagesWithLockFile>true</RestorePackagesWithLockFile>
        <RunAnalyzersDuringBuild>False</RunAnalyzersDuringBuild>
    </PropertyGroup>

    <ItemGroup>
        <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="6.*" />
        <PackageReference Include="Microsoft.Data.SqlClient" Version="5.*" />
        <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="7.*">
            <PrivateAssets>all</PrivateAssets>
            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
        </PackageReference>
        <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="7.*" />
        <PackageReference Include="Swashbuckle.AspNetCore" Version="6.*" />
        <PackageReference Include="Scrutor" Version="4.*" />
    </ItemGroup>

    <ItemGroup>
        <None Update="Microsoft.Data.SqlClient.dll">
            <CopyToOutputDirectory>Always</CopyToOutputDirectory>
        </None>
    </ItemGroup>

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

</Project>

已尝试无效的方案 #

• 移除dotnet publish步骤中的-r参数
• 使用Debug配置进行发布
• 将--self-contained false改为--no-self-contained
• 切换至Linux虚拟机镜像

问题根源 #

错误核心是独立的build步骤未针对指定运行时（win-x64）构建，导致publish步骤无法找到对应运行时的apphost.exe文件：

1. 当前build步骤默认用Any CPU构建，未指定运行时参数，不会生成win-x64对应的obj文件和apphost.exe
2. publish步骤指定-r win-x64和--no-restore，跳过了运行时相关文件的生成逻辑，触发复制不存在文件的错误
3. 非自包含Web应用默认不需要apphost.exe，但publish阶段因SDK逻辑仍尝试复制该文件

解决方案 #

方案1：统一build和publish的运行时参数 #

修改Build Solution任务，添加与publish一致的-r win-x64参数，确保build阶段生成对应运行时文件：

- task: DotNetCoreCLI@2
  displayName: Build Solution
  inputs:
    command: 'build'
    projects: '$(solution)'
    arguments: '--no-restore --configuration $(buildConfiguration) --r win-x64'

方案2：移除独立build步骤，由publish自动处理构建 #

dotnet publish会自动执行构建逻辑，单独的build步骤若参数不匹配易引发冲突。删除原Build Solution任务，保留publish参数（因已执行NuGet restore，可保留--no-restore）：

# 移除原Build Solution任务
- task: DotNetCoreCLI@2
  displayName: Publish to artifactstagingdirectory
  inputs:
    command: publish
    publishWebProjects: false
    projects: |
      **/Api.Web.csproj
    arguments: '-f net6.0 --self-contained false --no-restore --r win-x64 --output $(Build.Artifactstagingdirectory)/$(Build.BuildNumber) --configuration $(buildConfiguration)'
    zipAfterPublish: false

方案3：禁用Web应用的apphost生成 #

非自包含Web应用无需apphost.exe，在Api.Web.csproj的PropertyGroup中添加配置阻止生成和复制该文件：

<PropertyGroup>
    <!-- 原有配置 -->
    <UseAppHost>false</UseAppHost>
</PropertyGroup>

验证建议 #

优先尝试方案2，简化Pipeline流程避免参数不一致问题；若仍有问题，再尝试方案3禁用apphost生成。

内容的提问来源于stack exchange，提问作者Nicolas Pierre