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Add RazorViewToStringRenderer

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scottsauber committed Jul 6, 2018
1 parent e244f0d commit 285f02e63408c4262645bd422201c2a6f55018ac
Showing with 97 additions and 0 deletions.
  1. +97 −0 src/RazorHtmlEmails.RazorClassLib/Services/RazorViewToStringRenderer.cs
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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;
using System;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
namespace RazorHtmlEmails.RazorClassLib.Services
{
// Code from: https://github.com/aspnet/Entropy/blob/dev/samples/Mvc.RenderViewToString/RazorViewToStringRenderer.cs
public class RazorViewToStringRenderer : IRazorViewToStringRenderer
{
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(
actionContext,
view,
new ViewDataDictionary<TModel>(
metadataProvider: new EmptyModelMetadataProvider(),
modelState: new ModelStateDictionary())
{
Model = model
},
new TempDataDictionary(
actionContext.HttpContext,
_tempDataProvider),
output,
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(
Environment.NewLine,
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());
}
}
public interface IRazorViewToStringRenderer
{
Task<string> RenderViewToStringAsync<TModel>(string viewName, TModel model);
}
}

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