C# Razor HtmlHelper Extension for Conditional Wrapping Element Tag

README.md

C# Razor HtmlHelper Extension for Conditional Wrapping Element Tag

Usage

Conditionally render wrapping tag

Razor

@using UI.Extensions

@{
	var someCondition = true;
}

@using (Html.Wrap("div", someCondition)) {
	<span>This span is wrapped with a `&lt;div&gt;` if `someCondition` is `true`.</span>
}

Output

<div>
	<span>This span is wrapped with a `&lt;div&gt;` if `someCondition` is `true`.</span>
</div>

Conditionally set wrapping element tag

Razor

@using UI.Extensions

@{
	var someCondition = true;
	var tag = someCondition ? "a" : "span";
	var attributes = someCondition ? new { href = "#" } : new {};
}

@using (Html.Wrap("div", attributes, someCondition)) {
	<span>This span is wrapped with a `&lt;a href="#"&gt;` if `someCondition` is `true`.</span>
}

Output

<a href="#">
	<span>This span is wrapped with a `&lt;a href="#"&gt;` if `someCondition` is `true`.</span>
</a>

HtmlHelperExtensions.cs

using System.Collections.Generic;
using System.Diagnostics;
using System.Web;
using System.Web.Mvc;
using System.Web.Mvc.Html;

namespace UI.Extensions
{
	public static class HtmlHelperExtensions
	{
		public static HtmlWrap Wrap(this HtmlHelper htmlHelper, string tag)
		{
			return htmlHelper.Wrap(tag, true);
		}

		public static HtmlWrap Wrap(this HtmlHelper htmlHelper, string tag, bool condition)
		{
			return htmlHelper.Wrap(tag, new RouteValueDictionary(), condition);
		}

		public static HtmlWrap Wrap(this HtmlHelper htmlHelper, string tag, object htmlAttributes)
		{
			return htmlHelper.Wrap(tag, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes), true);
		}

		public static HtmlWrap Wrap(this HtmlHelper htmlHelper, string tag, IDictionary<string, object> htmlAttributes)
		{
			return htmlHelper.Wrap(tag, htmlAttributes, true);
		}

		public static HtmlWrap Wrap(this HtmlHelper htmlHelper, string tag,  object htmlAttributes, bool condition)
		{
			return htmlHelper.Wrap(tag, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes), condition);
		}

		public static HtmlWrap Wrap(this HtmlHelper htmlHelper, string tag, IDictionary<string, object> htmlAttributes, bool condition)
		{
			var htmlWrap = new HtmlWrap(htmlHelper.ViewContext, tag, htmlAttributes, condition);
			htmlWrap.WriteStart();
			return htmlWrap;
		}
	}
}

HtmlWrap.cs

using System;
using System.Collections.Generic;
using System.Web.Mvc;

namespace UI.Extensions
{
	public class HtmlWrap : IDisposable
	{
		private readonly ViewContext _viewContext;
		private readonly TagBuilder _tagBuilder;
		private readonly bool _condition;
		private bool _disposed;

		public HtmlWrap(ViewContext viewContext, string tag, IDictionary<string, object> htmlAttributes, bool condition)
		{
			_viewContext = viewContext;
			_tagBuilder = new TagBuilder(tag);
			_tagBuilder.MergeAttributes(htmlAttributes);
			_condition = condition;
		}

		public void Dispose()
		{
			Dispose(true);
			GC.SuppressFinalize(this);
		}

		protected virtual void Dispose(bool disposing)
		{
			if (_disposed) return;
			_disposed = true;
			WriteEnd();
		}

		public void WriteStart()
		{
			if (!_condition) return;
			_viewContext.Writer.Write(_tagBuilder.ToString(TagRenderMode.StartTag));
			_viewContext.Writer.Write(Environment.NewLine);
		}

		public void WriteEnd()
		{
			if (!_condition) return;
			_viewContext.Writer.Write(_tagBuilder.ToString(TagRenderMode.EndTag));
		}
	}
}

Is there any way to get the content which is inside the { } from within the HtmlWrap methods?