如何在不依赖控制器上下文的情况下将剃刀视图呈现给字符串？

using System;
using System.IO;
using System.Text;
using Microsoft.AspNetCore.Mvc.Razor;

public class RazorViewRenderer
{
    public static string RenderViewToString(string viewName, object model)
    {
        var httpContext = new DefaultHttpContext { RequestServices = serviceProvider };
        var actionContext = new ActionContext(httpContext, new RouteData(), new ActionDescriptor());

        using (var sw = new StringWriter())
        {
            var viewEngine = serviceProvider.GetService(typeof(IRazorViewEngine)) as IRazorViewEngine;
            var viewResult = viewEngine.FindView(actionContext, viewName, false);

            if (viewResult.View == null)
            {
                throw new ArgumentNullException($"{viewName} does not match any available view");
            }

            var viewDictionary = new ViewDataDictionary(new EmptyModelMetadataProvider(), new ModelStateDictionary())
            {
                Model = model
            };

            var viewContext = new ViewContext(
                actionContext,
                viewResult.View,
                viewDictionary,
                new TempDataDictionary(actionContext.HttpContext, serviceProvider.GetService(typeof(ITempDataProvider))),
                sw,
                new HtmlHelperOptions()
            );

            viewResult.View.RenderAsync(viewContext).GetAwaiter().GetResult();
            return sw.ToString();
        }
    }
}