升级Azure Function .NET 8后：依赖注入处理及调试问题求助

调试问题排查与修复 #

• 升级Azure Functions Core Tools至v4.0.5455及以上版本，确保支持.NET 8 Isolated运行时。
• 检查launchSettings.json配置，确保启动参数正确：

{
  "profiles": {
    "FunctionApp": {
      "commandName": "Project",
      "commandLineArgs": "--port 7071",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development",
        "AzureWebJobsStorage": "UseDevelopmentStorage=true"
      }
    }
  }
}

• 验证项目文件（.csproj）的框架与依赖配置：

<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" />
  <PackageReference Include="Microsoft.ApplicationInsights.WorkerService" Version="2.22.0" />
  <PackageReference Include="Microsoft.Azure.Functions.Worker.ApplicationInsights" Version="1.1.0" />
</ItemGroup>

• 清理项目的bin/obj目录，重新生成后再尝试调试，避免旧编译文件冲突。

依赖注入正确实现方式 #

在.NET 8 Isolated模式下，依赖注入通过HostBuilder的ConfigureServices方法完成，无需Startup.cs，针对你的代码调整如下：

修正Program.cs配置 #

你的代码中同时调用了ConfigureFunctionsWorkerDefaults()和ConfigureFunctionsWebApplication()，后者仅在需要为HTTP触发函数启用ASP.NET Core中间件管道时使用，若无需该特性可移除：

var host = new HostBuilder()
    .ConfigureFunctionsWorkerDefaults()
    .ConfigureServices(services =>
    {
        // 注册Application Insights服务
        services.AddApplicationInsightsTelemetryWorkerService();
        services.ConfigureFunctionsApplicationInsights();
        
        // 注册自定义服务（示例：添加作用域服务）
        services.AddScoped<IMyBusinessService, MyBusinessService>();
    })
    // 仅当需要HTTP中间件支持时保留此行，否则删除
    // .ConfigureFunctionsWebApplication()
    .Build();

host.Run();

在函数中注入服务 #

通过构造函数注入已注册的服务，示例：

public class OrderProcessingFunction
{
    private readonly IMyBusinessService _businessService;

    // 构造函数注入依赖
    public OrderProcessingFunction(IMyBusinessService businessService)
    {
        _businessService = businessService;
    }

    [Function("ProcessOrder")]
    public async Task<HttpResponseData> Run(
        [HttpTrigger(AuthorizationLevel.Function, "post")] HttpRequestData req)
    {
        var order = await req.ReadFromJsonAsync<Order>();
        var result = _businessService.Process(order);
        
        var response = req.CreateResponse(HttpStatusCode.OK);
        await response.WriteAsJsonAsync(result);
        return response;
    }
}

内容的提问来源于stack exchange，提问作者Mit Jacob