How to pass IHttpContextAccessor to DotLiquid's custom tag - asp.net-core-2.0

Question

My ASP.NET Core application is using dotliquid. I am creating my own custom dotliquid tag and I want to inject IHttpContextAccessor in my custom tag. Based on my research i have to create ITagFactory to create tag and inject IHttpContextAccessor.
my custom factory
public class LiquidTagFactory : DotLiquid.ITagFactory
{
private readonly Type _tagType;
private readonly string _tagName;
private readonly IHttpContextAccessor _contextAccessor;
public string TagName { get { return _tagName; } }
public LiquidTagFactory(Type tagType, string tagName, IHttpContextAccessor contextAccessor)
{
_tagType = tagType;
_tagName = tagName;
_contextAccessor = contextAccessor;
}
public Tag Create()
{
return (Tag)Activator.CreateInstance(_tagType, _contextAccessor);
}
}
my custom tag
public class TextBox : DotLiquid.Tag
{
private string _html = null;
private readonly IHttpContextAccessor _contextAccessor;
public TextBox(IHttpContextAccessor contextAccessor)
{
_contextAccessor = contextAccessor;
}
public override void Initialize(string tagName, string markup, List<string> tokens)
{
// here i want to store some values into HttpContext.Items
_contextAccessor.HttpContext.Items.Add("key","somedata");
base.Initialize(tagName, markup, tokens);
}
public override void Render(Context context, TextWriter result)
{
_html = CreateHtml();
result.Write(_html);
base.Render(context, result);
}
}
Then i would register this factory as
Template.RegisterTagFactory(new LiquidTagFactory(typeof(TexBox), "textbox", _httpContextAccessor));
However, i am using ASP.NET Core. I am not sure how do i register custom tag factory using .NET Core's dependency injection?
looking at dotliquid's template code it stores the ITagFactory in private static field
private static Dictionary<string, Tuple<ITagFactory, Type>> Tags { get; set;}
In my case, every request will have its own IHttpContextAccessor, and i don't want to create factory for each request

Answer 1

I think i found it. As per SO we can register IHttpContextAccessor singleton.
As of .NET Core 2.1 there is an extension method that has been added to correctly register an IHttpContextAccessor as a singleton. Simply add as follows in your ConfigureServices() method:
services.AddHttpContextAccessor();
This is equivalent to:
services.TryAddSingleton<IHttpContextAccessor, HttpContextAccessor>();
and then register the factory in Configure() method in startup. Make sure to pass IHttpContextAccessor as parameter
public void Configure(IApplicationBuilder app, IHostingEnvironment env, IOptions<DomainOptions> domainOps, IHttpContextAccessor httpContextAccessor)
{
Template.RegisterTagFactory(new LiquidTagFactory(typeof(TextBox), "textbox", httpContextAccessor));
}