ASP.NET Core Render Razor ViewModel to String

IViewRendererService.cs

using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Abstractions;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.Mvc.Razor;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Routing;

public interface IViewRendererService
{
    Task<string> RenderViewToStringAsync(string viewPath, object model);
    Task<string> RenderViewToStringAsync(object model);
}

ViewRendererService.cs

using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Abstractions;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.Mvc.Razor;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Routing;

public class ViewRendererService : IViewRendererService
{
    private readonly IRazorViewEngine _razorViewEngine;
    private readonly ITempDataProvider _tempDataProvider;
    private readonly IActionContextAccessor _actionContextAccessor;

    public ViewRendererService(IRazorViewEngine razorViewEngine,
        ITempDataProvider tempDataProvider,
        IActionContextAccessor actionContextAccessor)
    {
        _razorViewEngine = razorViewEngine;
        _tempDataProvider = tempDataProvider;
        _actionContextAccessor = actionContextAccessor;
    }


    public async Task<string> RenderViewToStringAsync(object model)
    {
        var actionName = _actionContextAccessor.ActionContext.ActionDescriptor.RouteValues["action"];
        return await RenderViewToStringAsync(actionName, model);
    }

    public async Task<string> RenderViewToStringAsync(string viewPath, object model)
    {
        var actionContext = _actionContextAccessor.ActionContext;
        var viewEngineResult = _razorViewEngine.FindView(actionContext, viewPath, false);

        if (viewEngineResult.View == null || (!viewEngineResult.Success))
        {
            throw new ArgumentNullException($"Unable to find view '{viewPath}'");
        }

        var view = viewEngineResult.View;
        var viewDictionary = new ViewDataDictionary(new EmptyModelMetadataProvider(), actionContext.ModelState);
        viewDictionary.Model = model;
        var tempData = new TempDataDictionary(actionContext.HttpContext, 
            _tempDataProvider);

        using (var sw = new StringWriter())
        {
            var viewContext = new ViewContext(actionContext, view, viewDictionary, tempData, sw, new HtmlHelperOptions());
            await view.RenderAsync(viewContext);
            return sw.ToString();
        }
    }
}

How To use it

How can I use it?

@polr @fnfworkshop Something like the following,

val renderedView = await viewRenderer.RenderViewToStringAsync("path/to/view.cshtml", model)

But, this was written way back. You're better off using Razor.Templating.Core

Thanks for sharing...