msbuild - 在 ASP.NET 5 的 Visual Studio Online 构建期间未定义或导入预定义类型 'System.Void'

Question

当我尝试在 Visual Studio Online 中构建项目时出现此错误:

Frontend\src\Frontend\Startup.cs(65,49):错误 CS0518:未定义或导入预定义类型“System.Void”
C:\a\1\s\Frontend\src\Frontend\Startup.cs(65,49): DNXCore,Version=v5.0 error CS0518: Predefined type 'System.Void' is not defined or import [C:\a\1\s\Frontend\src\Frontend\Frontend.xproj]

似乎错误发生在我引用另一个库(包类库)的地方。

附言我在这里进行了一些讨论:Easy way to build and deploy (to Azure) ASP.NET 5 in Visual Studio Team Services ，但毕竟没有答案，所以我仍然无法构建它......

网络项目.json:

"dependencies": {
    "Microsoft.AspNet.IISPlatformHandler": "1.0.0-rc1-final",
    "Microsoft.AspNet.Mvc": "6.0.0-rc1-final",
    "Microsoft.AspNet.Mvc.TagHelpers": "6.0.0-rc1-final",
    "Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final",
    "Microsoft.AspNet.StaticFiles": "1.0.0-rc1-final",
    "Microsoft.AspNet.Tooling.Razor": "1.0.0-rc1-final",
    "Microsoft.Extensions.Configuration.FileProviderExtensions": "1.0.0-rc1-final",
    "Microsoft.Extensions.Configuration.Json": "1.0.0-rc1-final",
    "Microsoft.Extensions.Configuration.UserSecrets": "1.0.0-rc1-final",
    "Microsoft.Extensions.Logging": "1.0.0-rc1-final",
    "Microsoft.Extensions.Logging.Console": "1.0.0-rc1-final",
    "Microsoft.Extensions.Logging.Debug": "1.0.0-rc1-final",
    "Web.Common": "1.0.0-*"
},

"frameworks": {
    "dnx451": { },
    "dnxcore50": { }
},

库项目.json

"frameworks": {
    "dnx451": { },
    "dnxcore50": {
        "dependencies": {
            "Microsoft.CSharp": "4.0.1-beta-23516",
            "System.Collections": "4.0.11-beta-23516",
            "System.Linq": "4.0.1-beta-23516",
            "System.Runtime": "4.0.21-beta-23516",
            "System.Threading": "4.0.11-beta-23516"
      }
    }
  },
"dependencies": {
    "Microsoft.AspNet.Mvc": "6.0.0-rc1-final"
  }

更新(问题和解决方案):

问题在于我的库引用不在同一个文件夹中，并且脚本默认情况下不在那里运行 dnu-restore，所以我不得不向上一级并开始在那里递归查找 project.json

$SourceRoot = Split-Path -Path $PSScriptRoot -Parent

# run DNU restore on all project.json files in the src folder including 2>1 to redirect stderr to stdout for badly behaved tools
Get-ChildItem -Path $SourceRoot -Filter project.json -Recurse | ForEach-Object { & dnu restore $_.FullName 2>1 }

感谢 Eddie - MSFT 的帮助!

Answer 1

我只是在更新“PreBuild.ps1”脚本中的代码以仅恢复 Web 项目的“project.json”文件后重现了这个问题。

原始代码(构建成功):

Get-ChildItem -Path $PSScriptRoot\src -Filter project.json -Recurse | ForEach-Object { & dnu restore $_.FullName 2>1 }

更新代码(构建失败:预定义类型“System.Void”未定义或导入):

Get-ChildItem -Path $PSScriptRoot\src\WebProjectName -Filter project.json -Recurse | ForEach-Object { & dnu restore $_.FullName 2>1 }

因此，您需要检查 PreBuild.ps1 脚本和 PowerShell 步骤的构建日志，以检查 Web 项目和库项目的 project.json 文件是否都已恢复。