ASP.NET Core调用另一个控制器并生成返回视图的html

var articleController = this.HttpContext.RequestServices.GetService(typeof(YESCMS.Controllers.ArticleController)) as YESCMS.Controllers.ArticleController;
//获取结果
var actionResult = articleController.DocList(v.Category);

//判断结果是否是一个ViewResult
if (actionResult is ViewResult)
{
	ViewResult viewResult = actionResult as ViewResult;


	var routeData = new RouteData();
	routeData.Values.Add("controller", "Article");
	routeData.Values.Add("action", "DocList");
	var serviceProvider = this.HttpContext.RequestServices.GetService(typeof(IServiceProvider)) as IServiceProvider;


	var httpContext = new DefaultHttpContext { RequestServices = serviceProvider };
	//var actionContext = new ActionContext(httpContext, routeData, new ActionDescriptor());
	var actionContext = new ActionContext(httpContext, routeData, articleListAction);

	//actionContext.ActionDescriptor = articleListAction;
	//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 = this.HttpContext.RequestServices;
	var viewEngine = services.GetService(typeof(Microsoft.AspNetCore.Mvc.ViewEngines.ICompositeViewEngine)) as Microsoft.AspNetCore.Mvc.ViewEngines.ICompositeViewEngine;
	Microsoft.AspNetCore.Mvc.ViewEngines.ViewEngineResult result = viewEngine.FindView(actionContext, 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();

	var viewDictionary = new ViewDataDictionary(new EmptyModelMetadataProvider(), new ModelStateDictionary());
	viewDictionary.Model = viewResult.Model;

	var tempDataProvider = services.GetService<ITempDataProvider>();
	var tempData = new TempDataDictionary(actionContext.HttpContext, tempDataProvider);

	using (var writer = new StringWriter(builder))
	{
		var viewContext = new ViewContext(
			actionContext,
			view,
			viewDictionary,
			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();
	}
	string html = builder.ToString();
}