Umbraco-CMS/src/Umbraco.Web/Mvc/PluginControllerAttribute.cs

using System;
using System.Linq;

namespace Umbraco.Web.Mvc
{
    // TODO: This has been moved to netcore so can be removed when ready

    [AttributeUsage(AttributeTargets.Class, AllowMultiple = false)]
    public class PluginControllerAttribute : Attribute
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="PluginControllerAttribute"/> class.
        /// </summary>
        /// <param name="areaName"></param>
        public PluginControllerAttribute(string areaName)
        {
            // validate this, only letters and digits allowed.
            if (areaName.Any(c => !char.IsLetterOrDigit(c)))
                throw new FormatException($"Invalid area name \"{areaName}\": the area name can only contains letters and digits.");

            AreaName = areaName;
        }

        /// <summary>
        /// Gets the name of the area.
        /// </summary>
        public string AreaName { get; }
    }
}