.Net Core 2.1：ObjectDisposedException：无法访问已处置的对象。对象名称：“ IServiceProvider”

Question

将现有的.Net Core 1.1项目迁移到.Net Core 2.1时。我已将DbContext添加到ConfigureConfig方法的服务中，如下所示。

public void ConfigureServices(IServiceCollection services)
{  
   //Configure the DB Context
   services.AddDbContext<AxDataContext>(options => 
   axDbContextOption.Configure(options), ServiceLifetime.Transient);
}

后来，我试图获得这样的服务。

private AxDataContext DataContext = 
this.ServiceProvider.GetService<AxDataContext>();

遇到了这样的错误。

An unhandled exception occurred while processing the request.
ObjectDisposedException: Cannot access a disposed object.
Object name: 'IServiceProvider'.
Microsoft.Extensions.DependencyInjection.ServiceLookup.ThrowHelper.ThrowObjectDisposedException()

Stack Query Cookies Headers
ObjectDisposedException: Cannot access a disposed object.
 Object name: 'IServiceProvider'.
Microsoft.Extensions.DependencyInjection.ServiceLookup.ThrowHelper.ThrowObjectDisposedException()
Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope.GetService(Type serviceType)
Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetService<T>(IServiceProvider provider)
Aximpro.Framework.WebCore.Providers.PageProvider.get_DataContext() in PageProvider.cs
+
        private AxDataContext DataContext => this.mDataContext ?? (this.mDataContext = this.ServiceProvider.GetService<AxDataContext>());

Stack Trace Image

同一段代码在.Net Core 1.1中运行正常。尽管this link描述了类似的问题，但我还是不明白，.Net Core 2.1在恢复注册服务时是否有任何更改。