您可以在Program.cs中播种数据。就像以下。

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

    using (var scope = host.Services.GetRequiredService<IServiceScopeFactory>().CreateScope())
    {
        await SeedData.EnsureSeedData(scope.ServiceProvider);
    }

    host.Run();
}

创建一个SeedData类，并在其中编写播种逻辑。

public static async Task EnsureSeedData(IServiceProvider provider)
{
    var dbContext = provider.GetRequiredService<MyDbContext>();
    await dbContext.Database.MigrateAsync();

    if(!await dbContext.MyTables.AnyAsync())
    {
        await dbContext.MyTables.AddAsync(new MyTable {})
        await dbContext.SaveChangesAsync();
    }
}