.NET MVC VIEW get back corresponding html

A, .Net get under Core Mvc

    Help build a class, as follows:

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.ViewEngines;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;

namespace NetCorePortal.Models
{
    public class ViewHtmlHelper
    {
        public static string ConvertToString(Controller controller, string viewName, object viewModel, bool isMainPage)
        {
            controller.ViewData.Model = viewModel;
            using (StringWriter sw = new StringWriter())
            {
                IViewEngine viewEngine = controller.HttpContext.RequestServices.GetService(typeof(ICompositeViewEngine)) as ICompositeViewEngine;
                ViewEngineResult viewEngineResult = viewEngine.FindView(controller.ControllerContext, viewName, isMainPage);
                if (viewEngineResult.Success)
                {
                    ViewContext viewContext = new ViewContext(
                        controller.ControllerContext,
                        viewEngineResult.View,
                        controller.ViewData,
                        controller.TempData,
                       sw,
                       new HtmlHelperOptions()
                        );
                    viewEngineResult.View.RenderAsync(viewContext);
                    return sw.GetStringBuilder().ToString();
                }
                else
                {
                    return $"视图{viewName}不存在";
                }
            }
        }
    }
}

    Background calling method

public ContentResult ViewToStringDemo()
{
    string strView = ViewHtmlHelper.ConvertToString(this, "Index", "", true);
    return Content(strView);
}

 Reference from: https://www.cjavapy.com/article/147/

 

Two, .Net Mvc obtained under

/// <summary>
/// 获得LayTreeGrid视图的HTML内容
/// </summary>
/// <returns></returns>
public ContentResult ViewText()
{
     string html = string.Empty;
     IView view = ViewEngines.Engines.FindView(this.ControllerContext, "LayTreegrid", null).View;

     ViewDataDictionary vdd = new ViewDataDictionary();
     TempDataDictionary tdd = new TempDataDictionary();
     using (System.IO.StringWriter sw = new System.IO.StringWriter())
     {
         ViewContext viewContext = new ViewContext(this.ControllerContext, view, vdd, tdd, sw);
         viewContext.View.Render(viewContext, sw);
         html = sw.ToString();
     }
     return Content(html);
}