Razor 模板自己渲染出结果 string

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.Mvc.Razor;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;

namespace XXX
{
    public class ViewRenderService
    {
        IRazorViewEngine _viewEngine;
        IHttpContextAccessor _httpContextAccessor;

        public ViewRenderService(IRazorViewEngine viewEngine, IHttpContextAccessor httpContextAccessor)
        {
            _viewEngine = viewEngine;
            _httpContextAccessor = httpContextAccessor;
        }

        public string Render(string viewPath)
        {
            return Render(viewPath, string.Empty);
        }

        public string Render<TModel>(string viewPath, TModel model)
        {
            var viewEngineResult = _viewEngine.GetView("~/", viewPath, false);

            if (!viewEngineResult.Success)
            {
                throw new InvalidOperationException($"Couldn't find view {viewPath}");
            }

            var view = viewEngineResult.View;

            using (var output = new StringWriter())
            {
                var viewContext = new ViewContext();
                viewContext.HttpContext = _httpContextAccessor.HttpContext;
                viewContext.ViewData = new ViewDataDictionary<TModel>(new EmptyModelMetadataProvider(), new ModelStateDictionary()) { Model = model };
                viewContext.Writer = output;

                view.RenderAsync(viewContext).GetAwaiter().GetResult();

                return output.ToString();
            }
        }
    }
}

在 Startup.cs 里注册这个 service 类

services.AddTransient<ViewRenderService>();

在 controller 类中定义使用

public class FriendlylinksController : BaseController {
	private readonly ViewRenderService _viewRender;
	public FriendlylinksController(ViewRenderService viewRender) {
		_viewRender = viewRender;
	}
}