azure - 抛出异常 : 'System.InvalidOperationException' in Microsoft. Extensions.DependencyInjection

Question

我正在使用 ASP.NET Core 进行网络作业。我无法正确设置依赖注入(inject)。

public static async Task Main(string[] args)
    {
            var host = BuildHost(args);

            using (host)
            {
                await host.RunAsync();
            }
    }


    public static IHost BuildHost(string[] args) =>
new HostBuilder()
    .ConfigureHostConfiguration(builder => 
    {
        builder
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile("appsettings.json")
            .AddEnvironmentVariables();
    })
    .ConfigureWebJobs(b =>
    {
        b.AddAzureStorageCoreServices();
        b.AddAzureStorage();
        b.AddTimers();
    })
    .ConfigureServices((hostBuilderContext, services) =>
    {
        services.AddScoped<ISchedularService, SchedularService>();
        //services.AddSingleton<IHostedService, PrintTimeService>()
    }).Build();

在functions.cs文件中，我在构造函数中访问了调度程序服务。但它没有触发构造函数并抛出异常，例如:

Exception thrown: 'System.InvalidOperationException' in Microsoft.Extensions.DependencyInjection

public class Functions
{

    private readonly ISchedularService _schedularService;
    public Functions(SchedularService schedularService)
    {
        _schedularService = schedularService;
    }
}

Answer 1

请确保您使用的是最新的软件包。我将你的代码与最新的软件包一起使用，效果很好。

我没有使用异步方法。

       static void Main(string[] args)
        {

            var host = BuildHost(args);

            using (host)
            {
                 host.Run();
            }           
        }

        public static IHost BuildHost(string[] args) =>
            new HostBuilder()
            .ConfigureHostConfiguration(builder =>
            {
                builder.SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json")
                .AddEnvironmentVariables();
            })
            .ConfigureWebJobs(b =>
            {
                b.AddAzureStorageCoreServices();
                b.AddAzureStorage();
                b.AddTimers();
            })
            .ConfigureServices((hostBuilderContext, services) =>
            {
                services.AddScoped<IWebJobConfiguration,WebJobConfiguration>();
            })
            .Build();

在 Functions.cs 中:

        private readonly IWebJobConfiguration _webJobConfiguration;
        public Functions(IWebJobConfiguration webJobConfiguration)
        {
            Console.WriteLine("*** DI via constructor ***");
            _webJobConfiguration = webJobConfiguration;
        }

        public void ProcessQueueMessage([QueueTrigger("queue111")] string message, ILogger logger)
        {
            Console.WriteLine(_webJobConfiguration.Message);
            Console.WriteLine(message + ";consoleqqqq");
        }

结果: