从 .NET 3 迁移到 .NET 5 时，Azure Function 中出现“未找到语言 [dotnet-isolated] 的函数”错误

Question

我正在尝试将在 .NET 3.1 上完美运行的 Azure Function 迁移到 .NET 5。我遵循了 Microsoft 的 GitHub 指南，但仍然无法让它在本地运行或调试（甚至没有尝试发布到 Azure）。

我收到此错误：

[2021-09-05T09:49:33.066Z] A host error has occurred during startup operation 'bb37a6db-b6f4-4396-bb9b-cb5ae0bba387'.
[2021-09-05T09:49:33.067Z] Microsoft.Azure.WebJobs.Script: Did not find functions with language [dotnet-isolated].

并且正在引发此异常：

这是我的 Program.cs：

static async Task Main(string[] args)
        {
            var host = new HostBuilder()
               .ConfigureAppConfiguration(c =>
               {
                   c.AddCommandLine(args);
               })
               .ConfigureServices(s =>
               {
                   s.AddLogging();
               })
               .Build();

            await host.RunAsync();
        }

这是我的项目文件：

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
    <AzureFunctionsVersion>v3</AzureFunctionsVersion>
    <UserSecretsId>76d0a5ed-221b-4b35-8ff4-3ee33d393196</UserSecretsId>
    <OutputType>Exe</OutputType>
    <_FunctionsSkipCleanOutput>true</_FunctionsSkipCleanOutput>
  </PropertyGroup>
  <ItemGroup>
    <None Remove="global.json" />
  </ItemGroup>
  <ItemGroup>
    <Content Include="global.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <ExcludeFromSingleFile>true</ExcludeFromSingleFile>
      <CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
    </Content>
  </ItemGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.Azure.Functions.Worker" Version="1.5.1" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Storage" Version="4.0.4" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="1.0.4" />
    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="5.0.2" />
    <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.11.1" />
    <PackageReference Include="System.Linq.Async" Version="5.0.0" />
  </ItemGroup>
  <ItemGroup>
    <None Update="config.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
    <None Update="local.settings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>Never</CopyToPublishDirectory>
    </None>
  </ItemGroup>
</Project>

我的 local.settings.json：

{
  "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "HIDDEN",
    "FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated"
  }
}

我的主机.json：

{
  "logging": {
    "fileLoggingMode": "always",
    "logLevel": {
      //"QueueWorkers.EmailQueueWorker": "Trace",
      //"QueueWorkers.EmailQueueWorker.EmailQueueWorker": "Trace",
      "default": "Information",
      "Function": "Trace",
      "Host.Results": "Error",
      "Host.Aggregator": "Trace"
    },
    "applicationInsights": {
      //"samplingExcludedTypes": "Request",
      "samplingSettings": {
        "isEnabled": true
      }
    },
    "console": {
      "isEnabled": "true"
    }
  },
  "Values": {
    "AzureWebJobsStorage": "HIDDEN",
    "FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated"
  },
  "extensions": {
    "queues": {
      "maxDequeueCount": 5,
      "maxPollingInterval": "00:00:02"
    }
  },
  "version": "2.0"
}

谢谢

Answer 1

在 Azure 中导航到您的函数，然后在“设置”->“配置”部分中更改应用程序设置：

"FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated"

Answer 2

在尝试将项目从 .net 5 迁移到 .net 6 功能时，在 Visual Studio 2022 中遇到了类似的问题...

一直告诉我“Microsoft.Azure.WebJobs.Script：没有找到语言[dotnet-isolated]的函数”

我的解决方案

1）我丢失了：Program.cs

using Microsoft.Azure.Functions.Worker.Configuration;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using System.Threading.Tasks;

namespace Main.Function
{
    public class Program
    {
        public static void Main()
        {
            var host = new HostBuilder()
                .ConfigureFunctionsWorkerDefaults()
                .Build();

            host.Run();
        }
    }
}

2) 编辑 .csproj > 在 ItemGroup 下...

消除：

<PackageReference Include="Microsoft.NET.Sdk.Functions" Version="4.0.1" />

用。。。来代替

<PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http" Version="3.0.13" />
      <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="1.3.0" OutputItemType="Analyzer" />
      <PackageReference Include="Microsoft.Azure.Functions.Worker" Version="1.6.0" />
      <PackageReference Include="Microsoft.Azure.WebJobs.Script.ExtensionsMetadataGenerator" Version="4.0.1" />

3）确保OutputType设置为exe

<OutputType>Exe</OutputType>

4）卸载项目并重新加载（构建前删除bin和obj文件夹）

Answer 3

好吧，仍然无法直接从 VS 2019 启动和调试，但如果从 CLI 启动并且调试正常，功能确实可以工作。

1. 添加Debugger.Launch();到Program.cs（Main方法的第一行）
2. 确保您<LangVersion>preview</LangVersion>的 csproj 中有（位于 TargetFramework 之后）。这条缺失的行实际上是阻止我的函数工作的关键差异。
3. 从 CLI 启动（从函数文件夹）：“func start --verbose”

谢谢