介绍

最近，Rider 调试 Unity 突然失效了，表现为没有 Attach to Unity 按钮，调试按钮无法点击。

在 Errors 面板中有如下提示：

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Project 'Assembly-CSharp-firstpass' load finished with warnings: The reference assemblies for .NETFramework,Version=v3.5 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks at (1175:5)
Project 'Assembly-CSharp' load finished with warnings: The reference assemblies for .NETFramework,Version=v3.5 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks at (1175:5)
Project 'Assembly-CSharp-Editor-firstpass' load finished with warnings: The reference assemblies for .NETFramework,Version=v3.5 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks at (1175:5)
Project 'Assembly-CSharp-Editor' load finished with warnings: The reference assemblies for .NETFramework,Version=v3.5 were not found. To resolve this, install the Developer Pack (SDK/Targeting Pack) for this framework version or retarget your application. You can download .NET Framework Developer Packs at https://aka.ms/msbuild/developerpacks at (1175:5)

环境

  • Rider 2019.1.1
  • Unity 5.6.6f2
  • macOS 10.14.6

查找

尝试重启 Unity、Rider、换用不同版本 Rider、同步 Unity Rider 插件等等操作，发现依然无效。

搜索后发现有可能是因为 MSBuild 发生变化，Rider | Preferences | Build, Execution, Deployment | Toolset and Build 打开设置后发现问题果然出在这儿：最近安装了 dotnet core 3.1，这里的路径也变成 dotnet core 中的了。

尝试自定义 Mono executable path 发现可以同步修改 MSBuild，改完后依然无效，最终确定需要耐心等待 Rider 使用新配置的 MSBuild 扫描完工程才能使用。

最后记得要切换回 Unity 确保 Unity Rider 插件正常工作，Rider 右下角中 Unity 标志提示已连接。

注意：这里的选项最好根据当前项目使用的 Unity 版本修改，不同的 Unity 版本使用不同的 MSBuild。例如，Unity 5.6.6f2 与 Unity 2018.4.12f1 的版本就不同。