A (Mostly) Declarative Framework for Building Simple WPF-based Wizards

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace Olbert.Utilities
{
    /// <summary>
    /// a class of file utilities
    /// </summary>
    public static class FileUtils
    {
        // The TruncatePath method was posted by user Bigsby on the Microsoft social website and is presumably
        // in the public domain. You can read more about it at 
        // http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/0d0319ed-ea16-40c3-96c6-664b383b69cb/.
        // Thanx, Bigsby!

        /// <summary>
        /// References a function in the lightweight shell library which intelligently truncates a file path.
        /// </summary>
        /// <param name="pszOut">the returned truncated path</param>
        /// <param name="szPath">the path to truncate</param>
        /// <param name="cchMax">the maximum number of characters allowed in the truncated path</param>
        /// <param name="dwFlags">truncation flags (ignored)</param>
        /// <returns>true if the conversion was successful, false otherwise</returns>
        [DllImport("Shlwapi.dll", CharSet = CharSet.Unicode)]
        static extern bool PathCompactPathEx( [Out] StringBuilder pszOut, string szPath, int cchMax, int dwFlags );

        /// <summary>
        /// Intelligently truncates a file path to the specified length
        /// </summary>
        /// <param name="path">the file path to truncate</param>
        /// <param name="length">the maximum acceptable length</param>
        /// <returns>a truncated file path</returns>
        public static string TruncatePath( string path, int length )
        {
            StringBuilder sb = new StringBuilder(length + 1);

            PathCompactPathEx(sb, path, length + 1, 0);

            return sb.ToString();
        }
    }
}