Create Custom HTML Helper in ASP.Net Core

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For me I thought my HTML helpers weren’t working until I spotted that the extension method is now on IHtmlHelper not HtmlHelper.

So for .net core:

public static IHtmlContent CheckboxListFor<TModel>(this IHtmlHelper<TModel> html,
            Expression<Func<TModel, List<CheckboxListItem>>> expression) ...

Instead of for .net:

public static HtmlString CheckboxListFor<TModel>(this HtmlHelper<TModel> html,
            Expression<Func<TModel, List<CheckboxListItem>>> expression) ...

EDIT: I’ve also updated the return type for .net core to be IHtmlContent as using something like HtmlContentBuilder is a nicer way to compose HTML content and returning that returns IHtmlContent

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