Custom tag helper not working

Question

I followed a few guides on creating a custom tag helper for ASP Core.

This is my helper:

using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.Asp         


        

Answer 1

Another thing to check if you're finding you can't set your content with calls like:

output.Content.AppendHtml("");
output.Content.SetHtmlContent("");

Is to check that you didn't use your tag helper as an empty/void element, e.g.:

To add content the tag helper must have a closing tag: