View not rendering on NET Core

View not rendering on NET Core

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View not rendering on NET Core
Tag : chash , By : dnyaneshwar
Date : November 29 2020, 04:01 AM

seems to work fine The tag helpers are opt-in, and require you to import them for them to work.
Make sure you have a file named _ViewImports.cshtml in your Views folder, and make sure it adds the namespaces of helpers that you want.
@using AuthoringTagHelpers
@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
@addTagHelper *, AuthoringTagHelpers

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BCL classes not found when rendering view in ASP.NET Core 1

Tag : asp.net-mvc , By : user185144
Date : March 29 2020, 07:55 AM
this will help To use the latest MVC RC2 nightly builds with DNX, you must reference a compatibility package named Microsoft.AspNetCore.Mvc.Dnx and call services.AddMvcDnx() from your ConfigureServices() method.
Read https://github.com/aspnet/Announcements/issues/154 for more information.

How to check if view component exists before rendering in razor view in ASP.NET Core

Tag : chash , By : Matt
Date : March 29 2020, 07:55 AM
may help you . You can inject IViewComponentSelector into your view to check if component exists:
@inject Microsoft.AspNetCore.Mvc.ViewComponents.IViewComponentSelector selector

@if (selector.SelectComponent("MyComponent")!= null)
    @await Component.InvokeAsync("MyComponent", new { data = 1 })
    <p>Component not found</p>

MVC Core - strange view rendering issue

Tag : asp.net-mvc , By : scott.sizemore
Date : March 29 2020, 07:55 AM
this will help MVC stores the posted back values in ModelState.
These values are used by default in @Html helpers - as a convenience. This allows the values of hidden form fields to be preserved through postbacks, even if they don't have properties in the view-model.
    public IActionResult ConfirmDetails(CreateSaleViewModel model)
        var viewModel = new ConfirmDetailsViewModel
            ConfirmOrderId = model.OrderId,

        ModelState.Clear();        // force asp-helpers to use the updated model's values

        return View("ConfirmDetails", viewModel);

Rendering Partial View to String in Asp.net Core 2.2

Tag : chash , By : abuiles
Date : March 29 2020, 07:55 AM
Does that help Why Json result with html string? You can return a partial view directly to return html.
public IActionResult GetUpsertPartialView(MessageBoard messageBoard)

    return PartialView("someviewname", messageBoard);

Rendering view to string in core 3.0: Could not find an IRouter associated with the ActionContext

Tag : chash , By : Harvey
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Found a solution:
I figured that since creating an ActionContext and providing it with an empty RouteData object was giving me an IRouter exception, the next best solution was to see if I could just use the HttpContext from the actual request.
var htmlBody = await Renderer.RenderToString($"/Views/Shared/confirm-email.cshtml", model);
public class ViewRenderService : IViewRenderService
    private readonly IRazorViewEngine _razorViewEngine;
    private readonly ITempDataProvider _tempDataProvider;
    private readonly IHttpContextAccessor _contextAccessor;

    public ViewRenderService(IRazorViewEngine razorViewEngine,
                             ITempDataProvider tempDataProvider,
                             IHttpContextAccessor contextAccessor)
        _razorViewEngine = razorViewEngine;
        _tempDataProvider = tempDataProvider;
        _contextAccessor = contextAccessor;                                                                                            

    public async Task<string> RenderToString(string viewName, object model)
        var actionContext = new ActionContext(_contextAccessor.HttpContext, _contextAccessor.HttpContext.GetRouteData(), new ActionDescriptor());

        await using var sw = new StringWriter();
        var viewResult = FindView(actionContext, viewName);

        if (viewResult == 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(
            new TempDataDictionary(actionContext.HttpContext, _tempDataProvider),
            new HtmlHelperOptions()

        await viewResult.RenderAsync(viewContext);
        return sw.ToString();

    private IView FindView(ActionContext actionContext, string viewName)
        var getViewResult = _razorViewEngine.GetView(executingFilePath: null, viewPath: viewName, isMainPage: true);
        if (getViewResult.Success)
            return getViewResult.View;

        var findViewResult = _razorViewEngine.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);
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