如何使用 .NET 6 在 aspnet core Web 应用程序中执行 database.ensurecreated() ？

在.NET 5 Web应用程序中，我们在startup.cs中使用如下代码来使用实体框架初始化数据库：

using (var serviceScope = app.ApplicationServices.GetService<IServiceScopeFactory>().CreateScope())
{
    var context = serviceScope.ServiceProvider.GetRequiredService<ApplicationDbContext>();
    context.Database.EnsureCreated();
}

但在 .NET 6 中，我收到没有 ApplicationServices 的错误。我尝试了建议的解决方案here https://stackoverflow.com/a/71258326/1385857，但随后我收到运行时错误：“无法从根提供程序解析作用域服务‘WebApplication1.DataAccess.SchoolDbContext’”。我的program.cs中的完整代码如下：

using WebApplication1.DataAccess;
using Microsoft.EntityFrameworkCore;

WebApplicationBuilder builder = WebApplication.CreateBuilder(args);

builder.Configuration.AddJsonFile("appsettings.json");
builder.Services.AddRazorPages();

// Setup EF connection
// https://stackoverflow.com/a/43098152/1385857
// https://medium.com/executeautomation/asp-net-core-6-0-minimal-api-with-entity-framework-core-69d0c13ba9ab
builder.Services.AddDbContext<SchoolDbContext>(options => 
        options.UseSqlServer(builder.Configuration["Data:SchoolLocal:ConnectionString"]));

WebApplication app = builder.Build();

// https://stackoverflow.com/a/71258326/1385857
SchoolDbContext dbcontext = app.Services.GetRequiredService<SchoolDbContext>();
dbcontext.Database.EnsureCreated();
...

帮助会很棒。

WebApplication由返回builder.Build() has Services https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.builder.webapplication.services?view=aspnetcore-6.0允许创建范围的属性：

using(var scope = app.Services.CreateScope())
{
    var dbContext = scope.ServiceProvider.GetRequiredService<SchoolDbContext>();
    // use context
}