Ihostbuilder 不包含 configurewebhostdefaults 编译错误的定义

Question

我创建了一个 .NetCore 3.1 FunctionApp。我正在尝试在 startup.cs 中实现代码以访问 Azure KeyVault。我需要一些指导，因为我以前没有做过。到目前为止，我已经能够从文档中获得以下代码，但不知道如何使用它。我也收到编译时错误，说 ihostbuilder 在行中不包含 configurewebhostdefaults 的定义

 .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                });

我不确定为什么会收到此错误以及如何调用此方法

startup.cs

[assembly: FunctionsStartup(typeof(Startup))]
namespace SRL.CustomerOrder
{
    internal class Startup : FunctionsStartup
    {
        public override void Configure(IFunctionsHostBuilder builder)
        {
            builder.Services.AddAutoMapper(AppDomain.CurrentDomain.GetAssemblies());
            builder.Services.AddScoped<ISrlContext, CustomerManagerContext>();
            builder.Services.AddAutoMapper(typeof(Startup));

           
            builder.Services.AddDbContext<CustomerManagerContext>(options =>
               options.UseSqlServer(Environment.GetEnvironmentVariable(EnviornmentVariables.SrlContext)));

            builder.Services.AddTransient<ICustomerDetailsRepository, CustomerDetailsRepository>();
            builder.Services.AddTransient<ICustomerOrdersRepository, CustomerOrdersRepository>();
            builder.Services.AddTransient<IOrderDetailsRepository, OrderDetailsRepository>();

            
            //?? throw new InvalidOperationException()).EnableSensitiveDataLogging());
        }

       

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureAppConfiguration((context, config) =>
                {
                    if (context.HostingEnvironment.IsProduction())
                    {
                        var builtConfig = config.Build();

                        AzureServiceTokenProvider azureServiceTokenProvider = new AzureServiceTokenProvider();
                        var keyVaultClient = new KeyVaultClient(
                            new KeyVaultClient.AuthenticationCallback(
                                azureServiceTokenProvider.KeyVaultTokenCallback));

                        config.AddAzureKeyVault(
                            $"https://{builtConfig["KeyVaultName"]}.vault.azure.net/",
                            keyVaultClient,
                            new DefaultKeyVaultSecretManager());
                    }
                })
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                });
    }
}

建议的解决方案

使用环境变量从 local.settings.json 读取连接字符串。部署应用程序。 Azure 负责检索该环境的相应秘密

public override void Configure(IFunctionsHostBuilder builder)
        {
            var connectionString = Environment.GetEnvironmentVariable("ConnectionString");

            builder.Services.AddAutoMapper(AppDomain.CurrentDomain.GetAssemblies());
            builder.Services.AddScoped<ISrlContext, CustomerManagerContext>();
            builder.Services.AddAutoMapper(typeof(Startup));

            builder.Services.AddDbContext<CustomerManagerContext>(options =>
               options.UseSqlServer(connectionString));

            builder.Services.AddTransient<ICustomerDetailsRepository, CustomerDetailsRepository>();
            builder.Services.AddTransient<ICustomerOrdersRepository, CustomerOrdersRepository>();
            builder.Services.AddTransient<IOrderDetailsRepository, OrderDetailsRepository>();
        }

Answer 1

根据我的测试，如果你想在Azure函数中读取Azure key vault的秘密形式，请参考以下代码

1. Save the key vault name as a variable in Azure function app settings

2. Enable Azure MSI for Azure function

3. 为 MSI 配置访问策略

4. 代码

 public static class Http
    {
        private static IConfiguration Configuration;

        static Http()
        {
            AzureServiceTokenProvider azureServiceTokenProvider = new AzureServiceTokenProvider();
            var keyVaultClient = new KeyVaultClient(
                new KeyVaultClient.AuthenticationCallback(
                    azureServiceTokenProvider.KeyVaultTokenCallback));
            Configuration = new ConfigurationBuilder()
                   .AddAzureKeyVault(string.Format("https://{0}.vault.azure.net/", Environment.GetEnvironmentVariable("keyVaultName")), 
                                   keyVaultClient,
                                   new DefaultKeyVaultSecretManager())
                   .Build();

        }

        [FunctionName("Http")]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
        {

           
            log.LogInformation("C# HTTP trigger function processed a request.");
            var f1= Configuration["DBConnectionString"];
            return new OkObjectResult("the DBConnectionString :" + f1);
        }


        
    }