将渲染的Razor视图另存为HTML字符串

using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Rendering;

namespace YourNamespace
{
    public class HomeController : Controller
    {
        private readonly IViewRenderService _viewRenderService;

        public HomeController(IViewRenderService viewRenderService)
        {
            _viewRenderService = viewRenderService;
        }

        public IActionResult Index()
        {
            // 创建ControllerContext对象，并设置相关属性
            var controllerContext = new ControllerContext
            {
                HttpContext = HttpContext,
                RouteData = RouteData,
                ActionDescriptor = new ActionDescriptor()
            };

            // 渲染视图为HTML字符串
            var htmlString = _viewRenderService.RenderViewToString(controllerContext, "YourViewName");

            // 将HTML字符串作为结果返回
            return Content(htmlString, "text/html");
        }
    }

    // 自定义的视图渲染服务
    public interface IViewRenderService
    {
        string RenderViewToString(ControllerContext controllerContext, string viewName);
    }

    public class ViewRenderService : IViewRenderService
    {
        private readonly ICompositeViewEngine _viewEngine;
        private readonly ITempDataProvider _tempDataProvider;
        private readonly IServiceProvider _serviceProvider;

        public ViewRenderService(ICompositeViewEngine viewEngine, ITempDataProvider tempDataProvider, IServiceProvider serviceProvider)
        {
            _viewEngine = viewEngine;
            _tempDataProvider = tempDataProvider;
            _serviceProvider = serviceProvider;
        }

        public string RenderViewToString(ControllerContext controllerContext, string viewName)
        {
            var viewResult = _viewEngine.FindView(controllerContext, viewName, false);

            if (!viewResult.Success)
            {
                throw new InvalidOperationException($"Could not find the view '{viewName}'");
            }

            var viewDictionary = new ViewDataDictionary(new EmptyModelMetadataProvider(), controllerContext.ModelState)
            {
                Model = controllerContext.Controller.ViewData.Model
            };

            using (var sw = new StringWriter())
            {
                var viewContext = new ViewContext(
                    controllerContext,
                    viewResult.View,
                    viewDictionary,
                    new TempDataDictionary(controllerContext.HttpContext, _tempDataProvider),
                    sw,
                    new HtmlHelperOptions()
                );

                viewResult.View.RenderAsync(viewContext).Wait();

                return sw.ToString();
            }
        }
    }
}