Render a Razor Page to string

Render a Razor Page to string

To render a Razor Page to a string, you can use the IRazorViewEngine service provided by ASP.NET Core. Here's an example of how to do it:

First, add a reference to the Microsoft.AspNetCore.Mvc.Razor package. Then, in your code, inject an instance of IRazorViewEngine into your class constructor:

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

Then, you can use the RenderToStringAsync extension method to render a Razor Page to a string:

public async Task<string> RenderPageToStringAsync<TModel>(string pageName, TModel model) { var actionContext = new ActionContext { HttpContext = new DefaultHttpContext { RequestServices = _serviceProvider }, RouteData = new RouteData(), ActionDescriptor = new PageActionDescriptor { ViewEnginePath = pageName, FilterDescriptors = new List<FilterDescriptor>() } }; var viewResult = _razorViewEngine.FindPage(actionContext, pageName); if (viewResult.Page == null) { throw new ArgumentNullException($"{pageName} does not match any available page"); } var viewDictionary = new ViewDataDictionary<TModel>(new EmptyModelMetadataProvider(), new ModelStateDictionary()) { Model = model }; var tempData = new TempDataDictionary(actionContext.HttpContext, _tempDataProvider); using (var writer = new StringWriter()) { var viewContext = new ViewContext( actionContext, viewResult.View, viewDictionary, tempData, writer, new HtmlHelperOptions()); await viewResult.View.RenderAsync(viewContext); return writer.ToString(); } }

You can call this method to render a Razor Page to a string:

var model = new MyModel(); var html = await RenderPageToStringAsync("/Pages/MyPage.cshtml", model);

Note that you need to provide the path to the Razor Page as an argument to RenderPageToStringAsync. In this example, the path is "/Pages/MyPage.cshtml". Also note that you need to provide the model as a generic argument to RenderPageToStringAsync.

Examples

  1. "Render Razor Page to string in ASP.NET Core"

    • Description: Find a solution for rendering a Razor Page to a string in an ASP.NET Core application, useful for scenarios like email templates or dynamic content generation.
    • Code:
      var serviceScopeFactory = serviceProvider.GetRequiredService<IServiceScopeFactory>(); using (var scope = serviceScopeFactory.CreateScope()) { var viewRenderService = scope.ServiceProvider.GetRequiredService<IViewRenderService>(); var model = // your model data; var result = await viewRenderService.RenderToStringAsync("/Pages/YourPage.cshtml", model); // 'result' now contains the rendered Razor Page content as a string }

  2. "ASP.NET Core Razor Page to string conversion"

    • Description: Learn how to convert the content of an ASP.NET Core Razor Page to a string for various use cases using the ViewRenderer service.
    • Code:
      public interface IViewRenderService { Task<string> RenderToStringAsync(string viewName, object model); }

  3. "Render PartialView to string in ASP.NET Core"

    • Description: Explore rendering a PartialView to a string in ASP.NET Core, applicable when you need to extract the HTML content for partial views.
    • Code:
      public class ViewRenderService : IViewRenderService { 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 RouteData(), new 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(); } } }

  4. "Convert Razor Page to HTML string ASP.NET Core"

    • Description: Find a method for converting an ASP.NET Core Razor Page into an HTML string using a custom ViewRenderService.
    • Code:
      var serviceScopeFactory = serviceProvider.GetRequiredService<IServiceScopeFactory>(); using (var scope = serviceScopeFactory.CreateScope()) { var viewRenderService = scope.ServiceProvider.GetRequiredService<IViewRenderService>(); var model = // your model data; var result = await viewRenderService.RenderToStringAsync("/Pages/YourPage.cshtml", model); // 'result' now contains the HTML string representation of the Razor Page }

  5. "Razor Page to string in ASP.NET Core ViewComponent"

    • Description: Render a Razor Page to a string within an ASP.NET Core ViewComponent for modular and reusable content rendering.
    • Code:
      public class YourViewComponent : ViewComponent { private readonly IViewRenderService _viewRenderService; public YourViewComponent(IViewRenderService viewRenderService) { _viewRenderService = viewRenderService; } public async Task<IViewComponentResult> InvokeAsync() { var model = // your model data; var result = await _viewRenderService.RenderToStringAsync("/Pages/YourPage.cshtml", model); return Content(result); } }

  6. "Render Razor Page as string from controller"

    • Description: Discover how to render a Razor Page to a string directly from a controller in an ASP.NET Core application.
    • Code:
      public class YourController : Controller { private readonly IViewRenderService _viewRenderService; public YourController(IViewRenderService viewRenderService) { _viewRenderService = viewRenderService; } public async Task<IActionResult> YourAction() { var model = // your model data; var result = await _viewRenderService.RenderToStringAsync("/Pages/YourPage.cshtml", model); // Use 'result' as needed return View(); } }

  7. "ASP.NET Core Razor Page render to string async"

    • Description: Implement asynchronous rendering of an ASP.NET Core Razor Page to a string for improved performance and responsiveness.
    • Code:
      public class ViewRenderService : IViewRenderService { // Existing code public async Task<string> RenderToStringAsync(string viewName, object model) { var httpContext = new DefaultHttpContext { RequestServices = _serviceProvider }; var actionContext = new ActionContext(httpContext, new RouteData(), new 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(); } } }

  8. "ASP.NET Core Razor Page rendering service"

    • Description: Understand the concept of a rendering service for Razor Pages in ASP.NET Core and how it can be used to convert pages to strings.
    • Code:
      public interface IViewRenderService { Task<string> RenderToStringAsync(string viewName, object model); }

  9. "C# Razor Page HTML string generation"

    • Description: Explore methods for generating HTML strings from Razor Pages in C# for dynamic content rendering in various scenarios.
    • Code:
      var serviceScopeFactory = serviceProvider.GetRequiredService<IServiceScopeFactory>(); using (var scope = serviceScopeFactory.CreateScope()) { var viewRenderService = scope.ServiceProvider.GetRequiredService<IViewRenderService>(); var model = // your model data; var result = await viewRenderService.RenderToStringAsync("/Pages/YourPage.cshtml", model); // 'result' now contains the HTML string representation of the Razor Page }

  10. "Razor Page to string in background task"

    • Description: Render a Razor Page to a string in the background task or separate thread for improved performance and non-blocking behavior.
    • Code:
      var serviceScopeFactory = serviceProvider.GetRequiredService<IServiceScopeFactory>(); await Task.Run(() => { using (var scope = serviceScopeFactory.CreateScope()) { var viewRenderService = scope.ServiceProvider.GetRequiredService<IViewRenderService>(); var model = // your model data; var result = viewRenderService.RenderToStringAsync("/Pages/YourPage.cshtml", model).Result; // 'result' now contains the HTML string representation of the Razor Page } });

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