.Net6 中的 IHost 扩展

Question

我正在尝试将用于 EF 种子迁移的 IHost 扩展从 .Net5 迁移到 .Net6。 能否请您指导我进行此转换的正确方法。

 public static class HostExtensions
    {
        public static IHost MigrateDatabase<TContext>(this IHost host,
                                            Action<TContext, IServiceProvider> seeder,
                                            int? retry = 0) where TContext : DbContext
        {
            int retryForAvailability = retry.Value;

            using (var scope = host.Services.CreateScope())
            {
                var services = scope.ServiceProvider;
                <code removed for brevity>                 
            }
            return host;
        }
    }

在 .Net5 中调用扩展如下：

  public static void Main(string[] args)
        {
            CreateHostBuilder(args)
                .Build()
                .MigrateDatabase<OrderContext>((context, services) =>
                {
                    var logger = services.GetService<ILogger<OrderContextSeed>>();
                    OrderContextSeed
                        .SeedAsync(context, logger)
                        .Wait();
                })
                .Run();
        }

Answer 1

迁移数据库：

public static IHost MigrateDatabase(this IHost host)
    {
        using var scope = host.Services.CreateScope();

        var sp = scope.ServiceProvider;
        var loggerFactory = sp.GetRequiredService<ILoggerFactory>();

        // operations 
       
        return host;
    }

程序.cs：

var builder = WebApplication.CreateBuilder(args);

builder.Host
    .Build()
    .MigrateDatabase();

var app = builder.Build();

apo.Run();

Answer 2

在 Program.cs 中这样使用:)

var app = builder.Build();
 app.MigrateDatabase<WebSocketAcceptContext>();