Sitecore RenderSVG HtmlHelper for svg-inject

.cs

using Sitecore;
using Sitecore.Data.Fields;
using Sitecore.Data.Items;
using Sitecore.Resources.Media;
using System;
using System.IO;
using System.Web.Mvc;

namespace Foundation.SitecoreHelpers.Extensions
{
    public static class HtmlHelpers
    {
        public static MvcHtmlString RenderSvg2(this HtmlHelper htmlHelper, ImageField image)
        {
            if (image == null || image.MediaItem == null) { return new MvcHtmlString($"<!-- Empty {(image == null ? "Image Field" : "Media Item")} -->"); }

            var imageMediaItem = new MediaItem(image.MediaItem);
            if (Sitecore.Context.Item.Editing.IsEditing || imageMediaItem.MimeType != "image/svg+xml") {
                return new MvcHtmlString(String.Format("<img src=\"{0}\" alt=\"{1}\" />", StringUtil.EnsurePrefix('/', MediaManager.GetMediaUrl(imageMediaItem)), image.Alt));
            }

            return new MvcHtmlString(string.Format("<img src=\"{0}\" alt=\"{1}\" onload=\"SVGInject(this)\" />", StringUtil.EnsurePrefix('/', MediaManager.GetMediaUrl(imageMediaItem)), image.Alt));
        }
    }
}