从.net 6更新到.net 8后无法引用builder.ConfigurationBuilder

Question

这是错误：

经过大量浪费时间，我终于将问题范围缩小到这行代码：

public class Startup : FunctionsStartup
{
    public override void ConfigureAppConfiguration(IFunctionsConfigurationBuilder builder)
    {
        // If I comment out this line of code the project will run
        builder.ConfigurationBuilder.AddEnvironmentVariables();
    }

    public override void Configure(IFunctionsHostBuilder builder)
    {
       // ...
    }
}

我发现如果我引用 builder.ConfigurationBuilder ，就会出现错误。我看到了一篇与此类似的帖子，但它是针对孤立的，而这不是孤立的。

最初我在另一台笔记本电脑上将此项目从 .net 6 更新到 .net 8，我相信它工作得很好。但是在获得一台新笔记本电脑并再次从源代码控制中获取该项目后，我遇到了这个问题。

我已确保引用了正确版本的 Microsoft.Extensions.Configuration.Abstractions，但我仍然收到此错误。

我还启动了一个全新的项目，并添加了一个具有相同行代码的 Startup 类，它产生了相同的结果。我应该有什么不同的方式在 .net 8 中添加启动代码吗？

Answer 1

如果

<Nullable>enable</Nullable>

中有

.csproj

，请将其删除。

有时可以通过删除 bin 和 obj 文件夹来解决此错误，按照GitHub问题中所述重新重建项目。

更新您的 .csproj，如下所示：

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <AzureFunctionsVersion>v4</AzureFunctionsVersion>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.Azure.Functions.Extensions" Version="1.1.0" />
    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="4.5.0" />
  </ItemGroup>
  <ItemGroup>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
    <None Update="local.settings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>Never</CopyToPublishDirectory>
    </None>
  </ItemGroup>
</Project>

我使用 Startup 类创建了一个 .NET 8.0 进程内 Azure 函数，并实现了您的代码，如下所示。

创业班：

using Microsoft.Azure.Functions.Extensions.DependencyInjection;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

[assembly: FunctionsStartup(typeof(FunctionApp.Startup))]

namespace FunctionApp
{
        public class Startup : FunctionsStartup
        {
            public override void Configure(IFunctionsHostBuilder builder)
            {
                builder.Services.AddSingleton<IMyService, MyService>();
            }
        public override void ConfigureAppConfiguration(IFunctionsConfigurationBuilder builder)
        {
            builder.ConfigurationBuilder.AddEnvironmentVariables();
        }

    }

    public interface IMyService
        {
            string GetMessage();
        }

        public class MyService : IMyService
        {
            public string GetMessage() => "Hello from MyService!";
        }
}

函数.cs：

 public class Function1
 {
     private readonly IMyService _myService;
     private readonly IConfiguration _configuration;

     // Constructor injects both the service and configuration
     public Function1(IMyService myService, IConfiguration configuration)
     {
         _myService = myService;
         _configuration = configuration;
     }
     [FunctionName("Function1")]
     public async Task<IActionResult> Run(
         [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req,
         ILogger log)
     {
         log.LogInformation("C# HTTP trigger function processed a request.");

         log.LogInformation($"Message from MyService: {_myService.GetMessage()}");

         string mySetting = _configuration["Setting1"];
         log.LogInformation($"Configuration value 'Setting1': {mySetting}");

         string name = req.Query["name"];

         string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
         dynamic data = JsonConvert.DeserializeObject(requestBody);
         name = name ?? data?.name;

         string responseMessage =  $"Hi {name}, This HTTP triggered function executed successfully." ;

         return new OkObjectResult(responseMessage);
     }
 }

local.settings.json：

{
    "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "FUNCTIONS_INPROC_NET8_ENABLED": "1",
    "FUNCTIONS_WORKER_RUNTIME": "dotnet",
    "Setting1": "Value"
  }
}

控制台输出：

Functions:

        Function1: [GET,POST] http://localhost:7146/api/Function1

For detailed output, run func with --verbose flag.
[2024-11-28T10:04:27.285Z] Host lock lease acquired by instance ID '000000000000xxxxCC'.
[2024-11-28T10:04:32.875Z] Executing 'Function1' (Reason='This function was programmatically called via the host APIs.', Id=694d84e8-f229-4f00-af98-812cfb115b30)
[2024-11-28T10:04:32.936Z] C# HTTP trigger function processed a request.
[2024-11-28T10:04:32.941Z] Message from MyService: Hello from MyService!
[2024-11-28T10:04:32.946Z] Configuration value 'Setting1': Value
[2024-11-28T10:04:33.062Z] Executed 'Function1' (Succeeded, Id=694d84e8-f229-4f00-af98-812cfb115b30, Duration=276ms)