Injecting content into specific sections from a partial view ASP.NET MVC 3 with Razor View Engine

Question

I have this section defined in my _Layout.cshtml

@RenderSection(\"Scripts\", false)

I can easily use it from a view:

Answer 1

Using Mvc Core you can create a tidy TagHelper scripts as seen below. This could easily be morphed into a section tag where you give it a name as well (or the name is taken from the derived type). Note that dependency injection needs to be setup for IHttpContextAccessor.

When adding scripts (e.g. in a partial)

When outputting the scripts (e.g. in a layout file)

Code

public class ScriptsTagHelper : TagHelper
    {
        private static readonly object ITEMSKEY = new Object();

        private IDictionary _items => _httpContextAccessor?.HttpContext?.Items;

        private IHttpContextAccessor _httpContextAccessor;

        public ScriptsTagHelper(IHttpContextAccessor httpContextAccessor)
        {
            _httpContextAccessor = httpContextAccessor;
        }

        public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
        {
            var attribute = (TagHelperAttribute)null;
            context.AllAttributes.TryGetAttribute("render",out attribute);

            var render = false;

            if(attribute != null)
            {
                render = Convert.ToBoolean(attribute.Value.ToString());
            }

            if (render)
            {
                if (_items.ContainsKey(ITEMSKEY))
                {
                    var scripts = _items[ITEMSKEY] as List;

                    var content = String.Concat(scripts);

                    output.Content.SetHtmlContent(content);
                }
            }
            else
            {
                List list = null;

                if (!_items.ContainsKey(ITEMSKEY))
                {
                    list = new List();
                    _items[ITEMSKEY] = list;
                }

                list = _items[ITEMSKEY] as List;

                var content = await output.GetChildContentAsync();

                list.Add(new HtmlString(content.GetContent()));
            }
        }
    }