您可以从 IWebHost 构建一个扩展方法，这将允许您在 Startup.cs 之前运行代码>.此外，您可以使用 ServiceScopeFactory 来初始化您拥有的任何服务(例如 DbContext).

You can build an extension method off of IWebHost which will allow you to run code before Startup.cs. Furthermore, you can use the ServiceScopeFactory to initialize any services you have (e.g. DbContext).

public static IWebHost CheckDatabase(this IWebHost webHost)
{
    var serviceScopeFactory = (IServiceScopeFactory)webHost.Services.GetService(typeof(IServiceScopeFactory));

    using (var scope = serviceScopeFactory.CreateScope())
    {
        var services = scope.ServiceProvider;
        var dbContext = services.GetRequiredService<YourDbContext>();

        while(true)
        {
            if(dbContext.Database.Exists())
            {
                break;
            }
        }
    }

    return webHost;
}

然后就可以使用该方法了.

Then you can consume the method.

public static void Main(string[] args)
{
    BuildWebHost(args)
        .CheckDatabase()
        .Run();
}