A simple Switch Framework for the Visual Studio prompt and the devenv command

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Text;
using System.Xml;
using EnvDTE80;
using Microsoft.VisualStudio.Shell.Interop;

namespace SwitchFramework
{
    /// <summary>
    /// Base abstract class for all switches.
    /// </summary>
    internal abstract class CustomSwitch
    {
        #region Events and Delegates

        /// <summary>
        /// Fires before executing switch.
        /// </summary>
        virtual public event EventHandler BeforeExecuting;

        /// <summary>
        /// Fires after executing switch.
        /// </summary>
        virtual public event EventHandler AfterExecuting;

        #endregion

        #region Constructors

        /// <summary>
        /// Default contructor.
        /// </summary>
        protected CustomSwitch()
        {
        }

        /// <summary>
        /// Contructor.
        /// </summary>
        /// <param name="package">Package that launch command.</param>
        /// <param name="name">Custom switch name.</param>
        /// <param name="parameters">Custom switch parameters.</param>
        protected CustomSwitch(ISwitchPackage package, string name, string[] parameters)
        {
            _package = package;
            _name = name;
            _parameters = parameters;
        }

        #endregion

        #region Properties

        ISwitchPackage _package = null;
        /// <summary>
        /// Gets ISwitchPackage.
        /// </summary>
        protected ISwitchPackage Package
        {
            get { return _package; }
        }

        string _name = string.Empty;
        /// <summary>
        /// Gets switch name.
        /// </summary>
        public string Name
        {
            get { return _name; }
        }

        string[] _parameters = null;
        /// <summary>
        /// Gets switch parameters.
        /// </summary>
        public string[] Parameters
        {
            get { return _parameters; }
        }

        #endregion

        #region Public Functions

        /// <summary>
        /// Checks parameters and executes the command.
        /// </summary>
        virtual public void Execute()
        {
            if (!CheckContext())
                throw new SwitchException(Resources.IllegalSwitchOrOption);

            if (BeforeExecuting != null)
                BeforeExecuting(this, null);

            Executing();

            if (AfterExecuting != null)
                AfterExecuting(this, null);
        }

        #endregion

        #region Protected Functions

        /// <summary>
        /// Executes the command.
        /// </summary>
        abstract protected void Executing();

        /// <summary>
        /// Checks switch and options.
        /// </summary>
        /// <returns>Returns true if all right.</returns>
        virtual protected bool CheckContext()
        {
            return true;
        }

        #endregion
    }
}