Create Custom HTML Helper in ASP.Net Core

Question

I want to create my own custom HTML Helper like the ones used in ASP.NET MVC, but I haven\'t been able to find how to implement them in the correct way.

I have found

Answer 1

Well i guess this answer won't be noticed but here's what i came up with using service registrations:

I hope it helps someone.

Register the service:

services.AddTransient();

Use the service:

var helper = HttpContext.RequestServices.GetRequiredService().Create();

Interface:

public interface IHtmlHelperFactory
{
    IHtmlHelper Create();
}

Implementation:

public class HtmlHelperFactory : IHtmlHelperFactory
{
    private readonly IHttpContextAccessor _contextAccessor;

    public class FakeView : IView
    {
        /// 
        public Task RenderAsync(ViewContext context)
        {
            return Task.CompletedTask;
        }

        /// 
        public string Path { get; } = "View";
    }

    public HtmlHelperFactory(IHttpContextAccessor contextAccessor)
    {
        _contextAccessor = contextAccessor;
    }

    /// 
    public IHtmlHelper Create()
    {
        var modelMetadataProvider = _contextAccessor.HttpContext.RequestServices.GetRequiredService();
        var tempDataProvider = _contextAccessor.HttpContext.RequestServices.GetRequiredService();
        var htmlHelper = _contextAccessor.HttpContext.RequestServices.GetRequiredService();
        var viewContext = new ViewContext(
            new ActionContext(_contextAccessor.HttpContext, _contextAccessor.HttpContext.GetRouteData(), new ControllerActionDescriptor()),
            new FakeView(),
            new ViewDataDictionary(modelMetadataProvider, new ModelStateDictionary()),
            new TempDataDictionary(_contextAccessor.HttpContext, tempDataProvider),
            TextWriter.Null,
            new HtmlHelperOptions()
        );

        ((IViewContextAware)htmlHelper).Contextualize(viewContext);
        return htmlHelper;
    }
}