C#判斷使用者輸入的本機路徑路徑是有效的

在stackoverflow看到的一片文章:Check if a string is a valid Windows directory (folder) path
可以使用Path.GetFullPath去判斷使用者輸入的本機路徑路徑是有效的
如果是無效的會丟出System.ArgumentException
只是空白字元算有效字元，如果怕使用者誤多輸入空白，可以自己判斷
if (inputPath.Contains(" ") )

Naming Files, Paths, and Namespaces
https://msdn.microsoft.com/en-us/library/aa365247

Use any character in the current code page for a name, including Unicode characters and characters in the extended character set (128–255), except for the following:

• The following reserved characters:
  • < (less than)
  • > (greater than)
  • : (colon)
  • " (double quote)
  • / (forward slash)
  • \ (backslash)
  • | (vertical bar or pipe)
  • ? (question mark)
  • * (asterisk)
• Integer value zero, sometimes referred to as the ASCII NUL character.
• Characters whose integer representations are in the range from 1 through 31, except for alternate data streams where these characters are allowed. For more information about file streams, see File Streams.
• Any other character that the target file system does not allow.

What characters are forbidden in Windows and Linux directory names?
http://stackoverflow.com/questions/1976007/what-characters-are-forbidden-in-windows-and-linux-directory-names