Determine via C# whether a string is a valid file path

Question

I would like to know how to determine whether string is valid file path.

The file path may or may not exist.

Answer 1

Regex driveCheck = new Regex(@"^[a-zA-Z]:\\$");
      if (string.IsNullOrWhiteSpace(path) || path.Length < 3)
      {
        return false;
      }

      if (!driveCheck.IsMatch(path.Substring(0, 3)))
      {
        return false;
      }
      string strTheseAreInvalidFileNameChars = new string(Path.GetInvalidPathChars());
      strTheseAreInvalidFileNameChars += @":/?*" + "\"";
      Regex containsABadCharacter = new Regex("[" + Regex.Escape(strTheseAreInvalidFileNameChars) + "]");
      if (containsABadCharacter.IsMatch(path.Substring(3, path.Length - 3)))
      {
        return false;
      }

      DirectoryInfo directoryInfo = new DirectoryInfo(Path.GetFullPath(path));
      try
      {
        if (!directoryInfo.Exists)
        {
          directoryInfo.Create();
        }
      }
      catch (Exception ex)
      {
        if (Log.IsErrorEnabled)
        {
          Log.Error(ex.Message);
        }
        return false;
      }`enter code here`

      return true;
    }