.NET 8 Isolated本地Azure函数报错：超出语言工作进程重启重试次数

问题详情 #

正在将Azure Functions项目从.NET 6升级至.NET 8 Isolated模式，本地运行时触发异常。新建的.NET 8 Isolated测试项目和已部署到生产环境的原有项目，本地运行均出现相同错误。

错误日志如下：

C:\Program Files\dotnet\dotnet.exe WorkingDirectory:C:\Users\LCK3SNS\source\repos\gcs-gcs-app\Hive.Azure.Functions\bin\Debug\net8.0 Arguments: "C:\Users\LCK3SNS\source\repos\gcs-gcs-app\Hive.Azure.Functions\bin\Debug\net8.0\Hive.Azure.Functions.dll" --host 127.0.0.1 --port 50616 --workerId acfc8109-5970-40a0-9703-c1ccd5d49630 --requestId 67f55fc8-9726-4c85-9322-fb7670094c46 --grpcMaxMessageLength 2147483647 --functions-uri http://127.0.0.1:50616/ --functions-worker-id acfc8109-5970-40a0-9703-c1ccd5d49630 --functions-request-id 67f55fc8-9726-4c85-9322-fb7670094c46 --functions-grpc-max-message-length 2147483647
[2024-07-14T01:53:56.732Z] C:\Program Files\dotnet\dotnet.exe process with Id=29220 started
[2024-07-14T01:53:56.973Z] Process 29220 has exited with code -2147450730.
[2024-07-14T01:53:56.980Z] Language Worker Process exited. Pid=29220.
[2024-07-14T01:53:56.983Z] C:\Program Files\dotnet\dotnet.exe exited with code -2147450730 (0x80008096). https://aka.ms/dotnet/app-launch-failed.
[2024-07-14T01:53:56.991Z] Handling WorkerErrorEvent for runtime:dotnet-isolated, workerId:dotnet-isolated. Failed with: Microsoft.Azure.WebJobs.Script.Workers.WorkerProcessExitException: C:\Program Files\dotnet\dotnet.exe exited with code -2147450730 (0x80008096)
[2024-07-14T01:53:56.995Z]  ---> System.Exception: https://aka.ms/dotnet/app-launch-failed
[2024-07-14T01:53:56.997Z]    --- End of inner exception stack trace ---
[2024-07-14T01:53:57.003Z] Attempting to dispose webhost or jobhost channel for workerId: 'acfc8109-5970-40a0-9703-c1ccd5d49630', runtime: 'dotnet-isolated'
[2024-07-14T01:53:57.020Z] No initialized worker channels for runtime 'dotnet-isolated'. Delaying future invocations
[2024-07-14T01:53:57.024Z] Restarting worker channel for runtime: 'dotnet-isolated'
[2024-07-14T01:53:57.030Z] Exceeded language worker restart retry count for runtime:dotnet-isolated. Shutting down and proactively recycling the Functions Host to recover

已尝试的操作：

• 卸载重装Azure Functions Core Tools
• 清理Visual Studio缓存
• 重建项目
• 重启电脑

怀疑问题源于本地未关闭的连接或进程耗尽（本地有PostgreSQL数据库连接）。

1. 验证.NET 8与Functions Core Tools兼容性 #

确保本地安装最新稳定版的Azure Functions Core Tools v4.x和完整的.NET 8 SDK（含运行时）。执行以下命令确认版本：

dotnet --version
func --version

2. 清理占用进程与端口 #

• 打开任务管理器，结束所有dotnet.exe和func.exe进程，再重新启动项目
• 检查日志中指定的端口（示例中为50616）是否被占用，可修改local.settings.json中的FUNCTIONS_CUSTOMHANDLER_PORT字段，指定一个未被使用的端口

3. 修复.NET运行时损坏 #

错误码0x80008096常与.NET运行时损坏相关，执行以下命令修复：

dotnet repair

4. 检查项目配置正确性 #

项目文件（.csproj）配置 #

确认已正确设置目标框架和Isolated模式依赖：

<PropertyGroup>
  <TargetFramework>net8.0</TargetFramework>
  <AzureFunctionsVersion>v4</AzureFunctionsVersion>
  <OutputType>Exe</OutputType>
</PropertyGroup>
<ItemGroup>
  <PackageReference Include="Microsoft.Azure.Functions.Worker" Version="1.20.0" />
  <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="1.16.0" />
</ItemGroup>

local.settings.json配置 #

确保运行时设置为dotnet-isolated：

{
  "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated"
  }
}

5. 排查数据库连接影响 #

暂时注释掉项目中所有PostgreSQL连接相关代码，启动项目验证是否是数据库连接导致的启动失败：

• 如果启动正常，逐步检查连接字符串是否正确
• 确认Npgsql等数据库客户端包已升级至支持.NET 8的版本

6. 启用详细日志定位问题 #

修改host.json添加详细日志配置，获取更具体的启动错误信息：

{
  "logging": {
    "logLevel": {
      "Microsoft.Azure.Functions.Worker": "Debug",
      "System.Net.Http": "Debug",
      "Microsoft.Extensions.Hosting": "Debug"
    }
  }
}

内容的提问来源于stack exchange，提问作者Ronak Panchal