您可以在 IWebHost 的基础上构建扩展方法，该方法可让您在 Startup.cs 之前运行代码>.此外，您可以使用 ServiceScopeFactory 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;
}

然后您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();
}