如何将视图呈现为dotnet核心中的字符串

services.AddControllersWithViews().AddRazorRuntimeCompilation();

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

public class ViewRenderService
{
    private readonly IRazorViewEngine _razorViewEngine;
    private readonly ITempDataProvider _tempDataProvider;
    private readonly IServiceProvider _serviceProvider;

    public ViewRenderService(IRazorViewEngine razorViewEngine, ITempDataProvider tempDataProvider, IServiceProvider serviceProvider)
    {
        _razorViewEngine = razorViewEngine;
        _tempDataProvider = tempDataProvider;
        _serviceProvider = serviceProvider;
    }

    public async Task<string> RenderToStringAsync(string viewName, object model)
    {
        var httpContext = new DefaultHttpContext { RequestServices = _serviceProvider };
        var actionContext = new ActionContext(httpContext, new Microsoft.AspNetCore.Routing.RouteData(), new Microsoft.AspNetCore.Mvc.Abstractions.ActionDescriptor());

        using (var sw = new StringWriter())
        {
            var viewResult = _razorViewEngine.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, _tempDataProvider),
                sw,
                new HtmlHelperOptions()
            );

            await viewResult.View.RenderAsync(viewContext);

            return sw.ToString();
        }
    }
}

public class HomeController : Controller
{
    private readonly ViewRenderService _viewRenderService;

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

    public async Task<IActionResult> Index()
    {
        var model = new MyViewModel(); // 替换为实际的视图模型
        var viewString = await _viewRenderService.RenderToStringAsync("Index", model); // 替换为实际的视图名称

        // 在这里可以使用viewString进行进一步处理，例如返回给前端或保存到数据库等

        return View();
    }
}