AP.NET Core获得注入管理器

/// <summary>
/// 获得视图响应的html
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
bool GetViewHtml(ActionExecutedContext context, out string html)
{
	//获取结果
	IActionResult actionResult = context.Result;
	//判断结果是否是一个ViewResult
	if (actionResult is ViewResult)
	{
		ViewResult viewResult = actionResult as ViewResult;
		//下面的代码就是执行这个ViewResult，并把结果的html内容放到一个StringBuiler对象中
		var services = context.HttpContext.RequestServices;
		var viewEngine = services.GetService(typeof(ViewEngines.ICompositeViewEngine)) as ViewEngines.ICompositeViewEngine;
		ViewEngines.ViewEngineResult result = viewEngine.FindView(context, viewResult.ViewName, true);

		//var executor = services.GetRequiredService<ViewResultExecutor>();
		var option = services.GetRequiredService<IOptions<MvcViewOptions>>();
		//var result = executor.FindView(context, viewResult);
		result.EnsureSuccessful(originalLocations: null);
		var view = result.View;
		StringBuilder builder = new StringBuilder();
		using (var writer = new StringWriter(builder))
		{
			var viewContext = new ViewContext(
				context,
				view,
				viewResult.ViewData,
				viewResult.TempData,
				writer,
				option.Value.HtmlHelperOptions);
			view.RenderAsync(viewContext).GetAwaiter().GetResult();
			//这句一定要调用，否则内容就会是空的
			writer.Flush();
		}
		html = builder.ToString();
		return true;
	}
	html = "";
	return false;
}

public class PageHtmlGenerateService : IDisposable
{
	HttpContext HttpContext;
	IServiceProvider ServiceProvider;
	IRazorViewEngine razorViewEngine;
	ITempDataProvider tempDataProvider;

	IActionDescriptorCollectionProvider m_actionDescriptorCollectionProvider;

	public PageHtmlGenerateService(HttpContext httpContext)
	{
		ServiceProvider = httpContext.RequestServices;
		HttpContext = new DefaultHttpContext { RequestServices = ServiceProvider };

		razorViewEngine = ServiceProvider.GetService(typeof(IRazorViewEngine)) as IRazorViewEngine;
		tempDataProvider = ServiceProvider.GetService(typeof(ITempDataProvider)) as ITempDataProvider;

		m_actionDescriptorCollectionProvider = ServiceProvider.GetService(typeof(IActionDescriptorCollectionProvider)) as IActionDescriptorCollectionProvider;
	}
}

/// <summary>
/// 操作者
/// </summary>
public class Operator : IOperator, IScopedDependency
{
	readonly IServiceProvider _serviceProvider;
	public Operator(IServiceProvider serviceProvider)
	{
		_serviceProvider = serviceProvider;
	}

	public void WriteUserLog(UserLogType userLogType, string msg)
	{
		using (var scop = _serviceProvider.CreateScope())
		{
			var db = scop.ServiceProvider.GetService<IDbAccessor>();
			await db.InsertAsync(log);
		}
	}
}