Disables the VBHTML and WebForm view engines for ASP.NET MVC

DisableVbHtml.cs

// -----------------------------------------------------------------------
// <copyright file="DisableVbHtml.cs" company="Conglomo">
// Copyright 2015 Peter Chapman. Code in Public Domain.
// </copyright>
// -----------------------------------------------------------------------

namespace Conglomo.Website
{
    using System;
    using System.Linq;
    using System.Web.Mvc;

    /// <summary>
    /// Extension methods for disabling VBHTML.
    /// </summary>
    public static class DisableVbHtml
    {
        /// <summary>
        /// Returns a value indicating whether the specified <see cref="System.String"/> object occurs within this string.
        /// </summary>
        /// <param name="source">The source.</param>
        /// <param name="value">The string to seek.</param>
        /// <param name="comparisonType">One of the enumeration values that specifies the rules for the search.</param>
        /// <returns>
        ///   <c>true</c> if the value parameter occurs within this string, or if value is the empty string (""); otherwise, <c>false</c>.
        /// </returns>
        public static bool Contains(this string source, string value, StringComparison comparisonType)
        {
            if (source != default(string) && value != default(string))
            {
                return source.IndexOf(value, comparisonType) >= 0;
            }
            else
            {
                return false;
            }
        }

        /// <summary>
        /// Disables the VBHTML views.
        /// </summary>
        /// <param name="engine">The engine.</param>
        /// <returns>
        /// A razor view engine without VBHTML support.
        /// </returns>
        /// <remarks>
        ///     Usage:
        ///     <c>
        ///         protected void Application_Start()
        ///         {
        ///             ViewEngines.Engines.Clear();
        ///             ViewEngines.Engines.Add(new RazorViewEngine().DisableVbhtml());
        ///         }
        ///     </c>
        /// </remarks>
        public static RazorViewEngine DisableVbhtml(this RazorViewEngine engine)
        {
            if (engine != default(RazorViewEngine))
            {
                engine.AreaViewLocationFormats = DisableVbHtml.FilterOutVbhtml(engine.AreaViewLocationFormats);
                engine.AreaMasterLocationFormats = DisableVbHtml.FilterOutVbhtml(engine.AreaMasterLocationFormats);
                engine.AreaPartialViewLocationFormats = DisableVbHtml.FilterOutVbhtml(engine.AreaPartialViewLocationFormats);
                engine.ViewLocationFormats = DisableVbHtml.FilterOutVbhtml(engine.ViewLocationFormats);
                engine.MasterLocationFormats = DisableVbHtml.FilterOutVbhtml(engine.MasterLocationFormats);
                engine.PartialViewLocationFormats = DisableVbHtml.FilterOutVbhtml(engine.PartialViewLocationFormats);
                engine.FileExtensions = DisableVbHtml.FilterOutVbhtml(engine.FileExtensions);
            }

            return engine;
        }

        /// <summary>
        /// Filters the out VBHTML views.
        /// </summary>
        /// <param name="source">The source.</param>
        /// <returns>
        /// The views with only CSHTML.
        /// </returns>
        private static string[] FilterOutVbhtml(string[] source)
        {
            if (source != default(string[]))
            {
                return source.Where(s => !s.Contains("vbhtml", StringComparison.OrdinalIgnoreCase)).ToArray();
            }
            else
            {
                return source;
            }
        }
    }
}