"No service for type 'Microsoft.AspNetCore.Mvc.ViewFeatures.ViewResultExecutor' has been registered"

悬赏园豆：30 [已解决问题] 解决于 2018-05-19 16:54

一个 ASP.NET Core 2.1 的站点，日志中有大量下面的错误：

System.InvalidOperationException: No service for type 'Microsoft.AspNetCore.Mvc.ViewFeatures.ViewResultExecutor' has been registered.
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType)
   at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider)

请问如何解决？

.net core

问题补充：

引发这个问题的代码：

var services = HttpContext.RequestServices;
var executor = services.GetRequiredService<ViewResultExecutor>();
var viewEngine = services.GetRequiredService<IRazorViewEngine>();