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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Abstractions;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.Mvc.Razor;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.ViewEngines;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Routing;
namespace Mvc.RenderViewToString
public class RazorViewToStringRenderer
private IRazorViewEngine _viewEngine;
private ITempDataProvider _tempDataProvider;
private IServiceProvider _serviceProvider;
public RazorViewToStringRenderer(
IRazorViewEngine viewEngine,
ITempDataProvider tempDataProvider,
IServiceProvider serviceProvider)
_viewEngine = viewEngine;
_tempDataProvider = tempDataProvider;
_serviceProvider = serviceProvider;
public async Task<string> RenderViewToStringAsync<TModel>(string viewName, TModel model)
var actionContext = GetActionContext();
var view = FindView(actionContext, viewName);
using (var output = new StringWriter())
var viewContext = new ViewContext(
new ViewDataDictionary<TModel>(
metadataProvider: new EmptyModelMetadataProvider(),
modelState: new ModelStateDictionary())
Model = model
new TempDataDictionary(
new HtmlHelperOptions());
await view.RenderAsync(viewContext);
return output.ToString();
private IView FindView(ActionContext actionContext, string viewName)
var getViewResult = _viewEngine.GetView(executingFilePath: null, viewPath: viewName, isMainPage: true);
if (getViewResult.Success)
return getViewResult.View;
var findViewResult = _viewEngine.FindView(actionContext, viewName, isMainPage: true);
if (findViewResult.Success)
return findViewResult.View;
var searchedLocations = getViewResult.SearchedLocations.Concat(findViewResult.SearchedLocations);
var errorMessage = string.Join(
new[] { $"Unable to find view '{viewName}'. The following locations were searched:" }.Concat(searchedLocations)); ;
throw new InvalidOperationException(errorMessage);
private ActionContext GetActionContext()
var httpContext = new DefaultHttpContext();
httpContext.RequestServices = _serviceProvider;
return new ActionContext(httpContext, new RouteData(), new ActionDescriptor());