通過webhost擴展方式初始化EFCore數據庫

1.定義WebHostMigrationExtensions類

 public static class WebHostMigrationExtensions
    {
        public static IWebHost MigrationDbContext<TContext>(this IWebHost host,
            Action<TContext, IServiceProvider> seeder) where TContext : DbContext
        {
            using
 
 (var scope = host.Services.CreateScope())
            {
                var services = scope.ServiceProvider;
                var logger = services.GetRequiredService<ILogger<TContext>>();
                var context = services.GetService<TContext>();
                try
                {
                    context.Database.Migrate();
                    seeder(context, services);
                    logger.LogInformation($"執行DbContext{typeof
 
(TContext).Name} seed執行成功！");
                }
                catch (Exception ex)
                {
                    logger.LogError(ex, $"執行DbContext{typeof(TContext).Name} seed執行失敗！");
                }
            }

            return host;
        }
    }

public class ApplicationContextSeed
 

    {
        private UserManager<User> _userManager;

        public async Task SeedAsync(ApplicationDbContext context,IServiceProvider service)
        {
            if (!context.Users.Any())
            {
                _userManager = service.GetRequiredService<UserManager<User>>();
                var defaultUser = new User
                {
                    UserName = "[email protected]",
                    Email = "[email protected]",
                    NormalizedEmail= "[email protected]",
                    NormalizedUserName = "admin"
                };
                var result = await _userManager.CreateAsync(defaultUser, "pwd123456");
                if (!result.Succeeded)
                {
                    throw new Exception("初始化數據庫失敗");
                }
            }
        }
    }

2.在buildWebHost中調用

public static void Main(string[] args)
        {
            BuildWebHost(args)
            .MigrationDbContext<ApplicationDbContext>((context, services) =>
                {
                    new ApplicationDbContextSeed().SeedAsync(context, services).Wait();
                })
                .Run();
        }

通過webhost擴展方式初始化EFCore數據庫