如何确保文件名文件夹名字有效

windows的 文件夹或者文件名必须不包含一些字符，并且长度有一定的限制，下面的两个方法可以确保文件或者文件夹的名字有效。

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static string MakeFilenameValid(string filename) {     if (filename == null)         throw new ArgumentNullException();       if (filename.EndsWith("."))         filename = Regex.Replace(filename, @"\.+$", "");       if (filename.Length == 0)         throw new ArgumentException();       if (filename.Length > 245)         throw new PathTooLongException();       foreach (char c in System.IO.Path.GetInvalidFileNameChars())     {           filename = filename.Replace(c, '_');     }               return filename; }   static string MakeFoldernameValid(string foldername) {     if (foldername == null)         throw new ArgumentNullException();       if (foldername.EndsWith("."))         foldername = Regex.Replace(foldername, @"\.+$", "");       if (foldername.Length == 0)         throw new ArgumentException();           if (foldername.Length > 245)         throw new PathTooLongException();           foreach (char c in System.IO.Path.GetInvalidPathChars())     {         foldername = foldername.Replace(c, '_');     }       return foldername; } <a href="http://blog.miniasp.com/post/2009/10/How-to-ensure-filename-and-foldername--is-valid.aspx" rel="noopener nofollow">http://blog.miniasp.com/post/2009/10/How-to-ensure-filename-and-foldername--is-valid.aspx</a>