Checks if a given file exists : File Util « File Stream « C# / C Sharp

Checks if a given file exists

 * BLLib.IO.FileUtil
 * Andy Tidball
 * Project: Black Lightning General Library
 * Copyright: GNU General Public License

using System;
using System.IO;

namespace BLLib.IO {
  /// <summary>
  /// A static utility class for working with files.  Often provides additional functionality for System.IO.File.
  /// </summary>
  public static class FileUtil {
    /// <summary>
    /// Checks if a given file exists.
    /// </summary>
    /// <param name="Filename">The filename to check for existance.</param>
    /// <param name="CaseSensitive">Whether or not the search should be case-sensitive.</param>
    /// <returns>True if the given file exists, false if it does not.</returns>
    public static bool Exists(string Filename, bool CaseSensitive) {
      // first, check if this file exists not counting cast
      bool FileExists = File.Exists(Filename);

      // if they don't care about case, just return what we already know
      if (!CaseSensitive) {
        return FileExists;

      // if this file didn't exist, just return now
      if (!FileExists) {
        return false;

      // to check the case, we're going to get a file list from the directory to compare against
      FileInfo Info = new FileInfo(Filename);
      FileInfo[] Files = Info.Directory.GetFiles(Filename, SearchOption.TopDirectoryOnly);

      // since we specified the filename as a pattern, we should have gotten exactly that one file returned
      System.Diagnostics.Debug.Assert(Files.Length == 1);

      // check to make sure the one filename received matches the entered filename, case-sensitively
      return (Filename == Files[0].Name);


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